GHC


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents


us-gaap:StatementClassOfStock
us-gaap:CommonStockValue

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ProductOrService
us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization

us-gaap:CostsAndExpenses

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:InterestExpense
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms, us-gaap:StatementBusinessSegments

us-gaap:InterestIncomeExpenseNet

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ProfitLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ProductOrService

us-gaap:Revenues
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:OtherAssetsCurrent

us-gaap:Land

us-gaap:MachineryAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:LeaseholdImprovementsGross

us-gaap:ConstructionInProgressGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:Goodwill
us-gaap:BusinessAcquisition
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:EquitySecuritiesFvNi
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
dei:LegalEntity

us-gaap:AccountsPayableCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:DebtCurrent

us-gaap:DividendsPayableCurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:MinorityInterest

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementClassOfStock
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:TreasuryStockValue

us-gaap:MinorityInterest

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss

us-gaap:ProfitLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateStatedPercentage

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:IncomeTaxAuthority
us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward
dei:LegalEntity
ghc:AcceleratedDepreciation

ghc:AdditionalUndistributedEarningsDueToDilutiveStockOptions

ghc:AmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
ghc:CARESActFund, us-gaap:StatementBusinessSegments, us-gaap:UnusualOrInfrequentItem
ghc:AmountOfRevenueRecognizedFromProviderReliefFund

ghc:AntidilutiveRestrictedStock

ghc:AverageOutstandingDebtAmount

ghc:ChangeinCapitalizedContractCostOther

ghc:ContractCostsCapitalizedDuringthePeriod

ghc:DeferredRevenuePeriodIncreaseDecreasePercentage

ghc:DepreciationDepletionAmortizationAndImpairment

ghc:DividendsPaidCommonStockAndSharebasedCompensationCash
us-gaap:Ownership, us-gaap:StatementBusinessSegments
ghc:Equityeffectofredemptionofredeemablenoncontrollinginterest
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass
ghc:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityForeignCurrencyTranslationGainLoss
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass
ghc:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityGainLossAccretionIncludedInEarnings
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass
ghc:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityGainLossChangesInFairValue

ghc:GainRelatedtoContingentConsideration
ghc:Transaction, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

ghc:IncomeLossAttributabletoRedeemableNoncontrollingInterestandNonredeemableNoncontrollingInterest

ghc:IncreaseDecreaseInLeaseLiabilitites
us-gaap:RetirementPlanType
ghc:NetPeriodicBenefitForDefinedBenefitPensionPlansExcludingEarlyRetirementProgramSpecialSeparationBenefitExpenseCurtailmentAndSettlement

ghc:NetProceedsFromSaleOfBusinessesPropertyPlantAndEquipmentAndOtherAssets

ghc:OperatingExpense

ghc:OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

ghc:OperatingLeaseAbandonmentCost
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

ghc:PaymentsToAcquireEquityMethodCostMethodInvestmentsAndOtherInvestments
us-gaap:RetirementPlanType
ghc:PercentOfPlanAssetsManagedByInvestmentCompanies

ghc:PercentageOfUndistributedEarningsAllocatedToCommonStockholders
us-gaap:StatementGeographical
ghc:PercentageofRevenuefromContractwithCustomerExcludingAssessedTax
us-gaap:TimingOfTransferOfGoodOrService
us-gaap:RetirementPlanType
ghc:PercentofPlanAssetsManagedInternallybyCompany

ghc:ProceedsFromPaymentsOfVehicleFloorPlanPayableNet

ghc:SellingGeneralandAdministrativeExpenses

ghc:TemporaryEquityChangeinRedemptionValue

ghc:UndistributedEarningsAllocatedToCommonStockholders
dei:LegalEntity
ghc:VehicleFloorPlanFacilityAssistance

ghc:WeightedAverageNumberOfPotentiallyDilutiveSharesOutstanding

us-gaap:AccretionExpense

us-gaap:AssetImpairmentCharges
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss

us-gaap:BusinessAcquisitionsProFormaRevenue

us-gaap:BusinessCombinationConsiderationTransferred1
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

us-gaap:BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1

us-gaap:BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual

us-gaap:BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual

us-gaap:BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain

us-gaap:CapitalizedContractCostAmortization

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:DebtInstrumentInterestRateDuringPeriod
dei:LegalEntity, us-gaap:DebtInstrument
ghc:CARESActFund, us-gaap:StatementBusinessSegments, us-gaap:UnusualOrInfrequentItem
us-gaap:DeferredRevenueRevenueRecognized1
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod
dei:LegalEntity, ghc:EarlyRetirmentProgramExpense, us-gaap:RetirementPlanType
ghc:EarlyRetirmentProgramExpense, us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:RetirementPlanType

us-gaap:Depreciation
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:DividendsCommonStockCash

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EquityMethodInvestmentRealizedGainLossOnDisposal

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGain

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:GainLossOnDispositionOfAssets1

us-gaap:GainLossOnSaleOfBusiness
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:GoodwillForeignCurrencyTranslationGainLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:GoodwillImpairmentLoss
us-gaap:StatementBusinessSegments

us-gaap:GoodwillPurchaseAccountingAdjustments

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInIncomeTaxes
us-gaap:AwardType
us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InvestmentIncomeInterest
us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms, us-gaap:StatementBusinessSegments

us-gaap:MarketableSecuritiesRealizedGainLoss

us-gaap:MinorityInterestChangeInRedemptionValue
us-gaap:StatementEquityComponents

us-gaap:MinorityInterestDecreaseFromRedemptions

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent
us-gaap:StatementEquityComponents
us-gaap:NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable

us-gaap:OperatingLeaseImpairmentLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingLeaseRightOfUseAssetAmortizationExpense

us-gaap:OtherAssetImpairmentCharges

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax

us-gaap:OtherComprehensiveIncomeLossTax
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingGainsLosses

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForRepurchaseOfRedeemableNoncontrollingInterest

us-gaap:PaymentsOfOrdinaryDividends

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireMarketableSecurities

us-gaap:ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital

us-gaap:ProceedsFromIssuanceOfDebt

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromRepaymentsOfBankOverdrafts

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProvisionForDoubtfulAccounts
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:RestructuringCharges
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:RestructuringReserveAcceleratedDepreciation
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:RestructuringSettlementAndImpairmentProvisions
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems
dei:LegalEntity
us-gaap:RevenueFromRelatedParties

us-gaap:SeveranceCosts1
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityOther
us-gaap:StatementEquityComponents

us-gaap:TangibleAssetImpairmentCharges
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:TemporaryEquityNetIncome

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents

us-gaap:UndistributedEarnings

us-gaap:UnrealizedGainLossOnInvestments
us-gaap:StatementClassOfStock
dei:EntityCommonStockSharesOutstanding
us-gaap:BusinessAcquisition
ghc:BusinessCombinationRecognizedIdentifiableAssetAcquiredandLiabiityAssumedCurrentandNoncurrentLeaseLiabilities
us-gaap:BusinessAcquisition
ghc:BusinessCombinationRecognizedIdentifiableAssetAcquiredandLiabilityAssumedLeaseRightofUseAsset
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments
ghc:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedStockCompensationLiabilitiesAssumed
us-gaap:BusinessAcquisition
ghc:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillandLiabilitiesAssumedLessNoncontrollingInterestNetOfCashReceived
us-gaap:BusinessAcquisition
ghc:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssets
us-gaap:StatementClassOfStock
ghc:CommonStockStatedMarketValuePerShare
us-gaap:IncomeTaxAuthority
ghc:DeferredTaxAssetOperatingLossesAndPriorStockAcquisitionsCarryforwardValuationAllowance

ghc:DeferredTaxLiabilitiesUnrealizedGainsonAvailableforsaleSecurities
us-gaap:RetirementPlanType
ghc:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeTax
ghc:DefinedBenefitPlansDisclosuresDefinedBenefitPlansAssumption, us-gaap:RetirementPlanType
ghc:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUltimateWeightedAverageInterestCreditingRate
us-gaap:StatementGeographical
ghc:EntityWideDisclosureOnGeographicAreasLongLivedAssetsExcludingGoodwillAndOtherIntangibleAssetsInForeignCountries

ghc:EquitySecuritiesFVNIAccumulatedGrossUnrealizedGain
us-gaap:IncomeTaxAuthority
ghc:FederalTaxImpactOfUnrecognizedTaxBenefitsthatWouldImpactEffectiveTaxRate

ghc:FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour
us-gaap:IncomeTaxAuthority
ghc:ForeignTaxCreditCarryforwards

ghc:IdentifiableAssets
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems
ghc:CarryforwardsPeriod, us-gaap:IncomeTaxAuthority
ghc:IncomeTaxLossCarryforwardsSubjecttoExpiration
us-gaap:IncomeTaxAuthority

ghc:InvestmentsInMarketableEquitySecuritiesAndOtherInvestments

ghc:LesseeOperatingLeaseLeaseNotyetCommencedPaymentsDue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
ghc:MandatorilyRedeemableNoncontrollingInterestFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency
us-gaap:IncomeTaxAuthority
ghc:OperatingLossesAndPriorStockAcqusitionsCarryforward
us-gaap:IncomeTaxAuthority
ghc:OperatingLossesAndPriorStockAcqusitionsCarryforwardIndefinitely
ghc:CarryforwardsPeriod, us-gaap:IncomeTaxAuthority
ghc:OperatingLossesAndPriorStockAcqusitionsCarryforwardSubjectToExpiration
us-gaap:ProductOrService, us-gaap:ContractWithCustomerDuration
ghc:RevenueRemainingPerformanceObligationPercentageofRevenueExpectedtobeRecognizedOverNext12Months
us-gaap:AwardType, us-gaap:StatementClassOfStock
ghc:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNonvestedWeightedAverageExercisePrice
us-gaap:AwardType, us-gaap:StatementClassOfStock
ghc:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedIntrinsicValue
ghc:CarryforwardsPeriod, us-gaap:IncomeTaxAuthority
ghc:TaxLossCarryforwardPriorStockAcquisitionUtilized
us-gaap:IncomeTaxAuthority
dei:LegalEntity
ghc:VehicleFloorPlanFacilityPayable

us-gaap:AccountsAndOtherReceivablesNetCurrent

us-gaap:AccountsPayableAndOtherAccruedLiabilitiesCurrent
ghc:Transaction, us-gaap:CounterpartyName, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:AccountsReceivableNet
ghc:Transaction, us-gaap:CounterpartyName, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:AccountsReceivableNetNoncurrent

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
us-gaap:RetirementPlanType

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:AdvancesToAffiliate

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AociLossCashFlowHedgeCumulativeGainLossAfterTax

us-gaap:BankOverdrafts

us-gaap:BuildingsAndImprovementsGross

us-gaap:BusinessAcquisitionCostOfAcquiredEntityTransactionCosts

us-gaap:BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:BusinessCombinationContingentConsiderationLiability
us-gaap:FairValueByMeasurementFrequency
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment

us-gaap:CapitalizedContractCostNet
us-gaap:ProductOrService
us-gaap:ContractWithCustomerAssetNetNoncurrent
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentFairValue

us-gaap:DebtLongtermAndShorttermCombinedAmount

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent
us-gaap:FairValueByMeasurementFrequency
us-gaap:AwardType, us-gaap:StatementBusinessSegments
us-gaap:DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
us-gaap:LongtermDebtType
us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredRevenue

us-gaap:DeferredRevenueCurrent
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsCapitalLossCarryforwards

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic
us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsForeign
us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
us-gaap:IncomeTaxAuthority
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsTaxCreditCarryforwards
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsForeign

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssets

us-gaap:DeferredTaxLiabilitiesLeasingArrangements
us-gaap:RetirementPlanType
us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
us-gaap:RetirementPlanType
ghc:DefinedBenefitPlansDisclosuresDefinedBenefitPlansAssumption, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
ghc:DefinedBenefitPlansDisclosuresDefinedBenefitPlansAssumption, us-gaap:Range, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
ghc:DefinedBenefitPlansDisclosuresDefinedBenefitPlansAssumption, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
ghc:DefinedBenefitPlanHealthCareCostTrendGroups, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
ghc:DefinedBenefitPlanHealthCareCostTrendGroups, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
us-gaap:ConcentrationRiskByType, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType

us-gaap:EmployeeRelatedLiabilitiesCurrent
us-gaap:AwardType, us-gaap:StatementClassOfStock
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentOwnershipPercentage

us-gaap:EquitySecuritiesFvNiCost

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityCurrent
dei:LegalEntity
us-gaap:FinanceLeaseRightOfUseAsset
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:ForeignCurrencyContractsLiabilityFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:GoodwillGross
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:IncomeTaxesReceivable
dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:InterestRateCashFlowHedgeLiabilityAtFairValue
us-gaap:FairValueByMeasurementFrequency

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryForLongTermContractsOrPrograms

us-gaap:InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves
us-gaap:ConcentrationRiskByType, us-gaap:RetirementPlanType
us-gaap:Investments
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:InvestmentsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:LongtermDebtType
us-gaap:LineOfCredit
us-gaap:LongtermDebtType, us-gaap:StatementBusinessSegments
us-gaap:LongtermDebtType
us-gaap:LoansPayableToBank
us-gaap:LongtermDebtType, us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType
us-gaap:Range
us-gaap:LossContingencyEstimateOfPossibleLoss
dei:LegalEntity, us-gaap:Ownership
us-gaap:MinorityInterestOwnershipPercentageByParent
us-gaap:Ownership, us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

us-gaap:MoneyMarketFundsAtCarryingValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:LongtermDebtType
us-gaap:NotesPayableToBank

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwardsValuationAllowance

us-gaap:OtherLongTermDebt

us-gaap:OtherReceivables
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:OtherShortTermInvestments
us-gaap:FairValueByMeasurementFrequency
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PrepaidExpenseCurrent

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount
us-gaap:BusinessAcquisition
us-gaap:RedeemableNoncontrollingInterestEquityOtherFairValue

us-gaap:RestrictedCashAndCashEquivalents

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue

us-gaap:RestrictedCashNoncurrent
us-gaap:StatementBusinessSegments
us-gaap:RestructuringReserve

us-gaap:RetainedEarningsUndistributedEarningsFromEquityMethodInvestees
us-gaap:ProductOrService, us-gaap:ContractWithCustomerDuration
us-gaap:RevenueRemainingPerformanceObligation

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange
us-gaap:AwardType, us-gaap:StatementClassOfStock
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
us-gaap:AwardType, us-gaap:StatementClassOfStock
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:SharesSubjectToMandatoryRedemptionSettlementTermsFairValueOfShares
us-gaap:FairValueByMeasurementFrequency
us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward
us-gaap:TaxCreditCarryforwardAmount
us-gaap:IncomeTaxAuthority
us-gaap:TaxCreditCarryforwardValuationAllowance
us-gaap:IncomeTaxAuthority
us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
us-gaap:LongtermDebtType
us-gaap:UnsecuredDebt
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Interest Expense
Balance Sheet
Cash And Cash Equivalents At Carrying Value
Assets
Inventory Finished Goods Net Of Reserves
Current Assets
Other Assets Current
NonCurrent Assets
Deferred Income Tax Assets Net
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Long Term Debt Current
Noncurrent Liabilities
Minority Interest
Stockholders Equity
Common Stock Value
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Accounts Receivable
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Dividends Common Stock Cash
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassANANA0.964NANANA0.964NANANA0.964NANANA0.964NANANA0.964NANANA0.964NANANA0.975NANANA1.169NANANA1.219NANANA1.229NANANA1.241NANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassBNANA19.036NANANA19.036NANANA19.036NANANA19.036NANANA19.036NANANA19.036NANANA19.025NANANA18.831NANANA18.781NANANA18.771NANANA18.759NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁4.9854.977NA5.0725.2015.274NA5.3295.3295.326NA5.3375.3625.473NA5.5545.5775.569NA5.5745.5745.652NA5.7385.755.737NA5.6967.3087.3017.3477.3377.2837.2667.2237.3767.5457.6157.6827.8027.9338.1198.3858.9049.1939.241
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▅▅▅▅▅▅▅▅▅▅▅▆▆▆▇▇██4.9684.9674.975.065.1965.2745.2845.2855.2855.2845.275.3025.3255.4365.4735.5185.5395.5355.5275.5445.5445.6235.7465.7385.725.7045.6785.6717.2847.2757.2667.2317.2297.2277.2237.2727.4317.5147.6017.8027.8528.0468.3368.8399.1269.175
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:RestrictedStock0.013NANANA0.01NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareBasic ▄▄▅▄▃▃▄▃▄▄▄▄▃▃▅▃▃▃▃▃▄▃▃▁▃▃▆▄█▄▄▃▃▃▃▄▃▃▃▃▃▃▃▃▃▃23.0722.4947.4515.253.61-6.3227.458.1210.7415.3810.6923.438.697.8438.764.457.513.776.65.910.826.638.78-40.259.923.5157.7113.18100.817.8521.24.076.020.64-6.5712.646.844.078.03-0.825.741.879.426.8510.04.91
us-gaap:EarningsPerShareDiluted ▄▄▅▄▃▃▄▃▄▄▄▄▃▃▅▃▃▃▃▃▄▃▃▁▃▃▆▄█▄▄▃▃▃▃▄▃▃▃▃▃▃▃▃▃▃22.9922.4447.3415.223.6-6.3227.258.0510.6515.2610.6123.288.637.7838.524.427.463.756.575.8710.766.598.72-40.259.873.4857.4113.12100.4817.7921.144.056.020.64-6.5712.646.844.078.03-0.825.741.879.426.8410.04.91
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ghc:EducationNANANA302.467333.175356.378354.214357.319367.763372.454346.91358.601370.005375.499380.575376.805386.499372.897391.236386.936419.213401.076421.548481.746523.625500.602551.381543.918547.181526.174555.011546.452548.23527.815NANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ghc:GrahamHealthcareGroupNANANA51.42649.18145.99442.71140.68840.64137.72837.9635.48638.20837.62138.6140.47338.22NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ghc:ManufacturingNANANA106.6983.239113.458107.347111.676114.873115.157117.723126.028126.462117.406NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ghc:TelevisionBroadcastingNANANA133.828100.762115.448123.452115.161116.628108.223152.647130.014114.086108.802111.023101.295106.10291.496108.791112.38996.5292.01895.18289.69390.75383.564102.44687.44288.29785.65185.68873.48880.22868.902NANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,us-gaap:AllOtherSegmentsNANANA123.09676.3889.268119.27898.225212.614173.83417.024150.665150.399137.538184.27179.125183.486118.324129.552122.313113.269108.71699.69470.052NANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:Subsegments,us-gaap:SubsegmentsConsolidationItems us-gaap:OperatingSegments,ghc:Education,ghc:HigherEducation,us-gaap:ReportableSubsegmentsNANANA83.84186.45373.53767.89278.71276.28882.7867.00589.26985.98199.83103.264133.459139.204144.31144.916148.602157.98165.549167.811203.529240.717237.568254.461249.882251.936253.779269.895266.061273.092271.86NANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:Subsegments,us-gaap:SubsegmentsConsolidationItems us-gaap:OperatingSegments,ghc:Education,ghc:KaplanInternational,us-gaap:ReportableSubsegmentsNANANA123.768164.713199.615197.74178.169188.58185.756184.429167.668184.303183.582190.431171.259171.747164.562184.294160.456182.325169.287184.787192.702200.703192.081225.408207.615213.262202.867232.657198.452187.968184.813NANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:Subsegments,us-gaap:SubsegmentsConsolidationItems us-gaap:OperatingSegments,ghc:Education,ghc:ProfessionalU.S.,us-gaap:ReportableSubsegmentsNANANA32.83128.67438.44934.71633.8235.14741.21435.47234.30231.05733.35627.02728.24927.36433.199NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:Subsegments,us-gaap:SubsegmentsConsolidationItems us-gaap:OperatingSegments,ghc:Education,ghc:SupplementalEducation,us-gaap:ReportableSubsegments▁█77.91179.655NANA79.78581.288NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:Subsegments,us-gaap:SubsegmentsConsolidationItems us-gaap:OperatingSegments,ghc:Education,ghc:TestPreparation,us-gaap:ReportableSubsegmentsNANANA59.73751.11142.83952.38464.7165.67361.1560.59867.74968.60459.15160.3272.6875.7364.56862.45478.29179.34966.46268.29483.70680.38169.22670.65285.10881.09867.80461.13777.43185.6968.943NANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,us-gaap:SubsegmentsConsolidationItems us-gaap:OperatingSegments,ghc:Education,us-gaap:IntersubsegmentEliminationsNANANA-0.904-0.815-1.267-0.877-0.542-0.294-0.748-0.866-0.53-0.382-0.705-0.641-0.642-0.239-0.557-0.452-0.46-0.459-0.347-0.123-0.096-0.135-0.132-0.343-0.179-0.5-0.29-0.791-0.568-0.189-0.405NANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
 TTM Greenblatt ROC _ _▆▆▆▆▅▅▆▅▆▆▇▆▆▆▆▆▆▆▇▆▇▆▆▁▇▆█▇▇▇▇▇▇▆▅▇▆▅▇▆▇▆█37.59133.84446.20140.2445.8778.08530.31216.26857.96340.00375.58260.73965.62644.21467.11644.57168.36129.054109.48968.03374.1451.87267.811-213.72388.89546.555146.22281.28194.48479.529105.52481.87393.0523.06-14.42575.92160.35317.469107.74551.96181.09352.003150.869NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:ComprehensiveIncomeNetOfTax ▃▃█▃▂▁▅▂▂▃▁▃▂▂▆▃▃▂▁▂▂▂116.438111.247536.77298.87835.922-71.188267.23825.05944.98690.038-52.541119.86213.34553.703367.64864.02959.13539.368-40.94640.33149.99641.015NANANANANANANANA555.69537.53361.12529.12916.85795.7647.08559.90763.512-41.22537.0440.894147.55283.42133.29191.37
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▇▅▃▆▄▁▅▃▅▄▄▄▅▅▆▄▄▄▄▄▆▆▄▆▆█▅▄▂▃▄▅▅▅▅▄▄▅▄▄▄▄▄▄▄▄0.5680.185-0.1980.4390.008-0.6460.136-0.180.114-0.0460.0530.0060.0690.0740.3820.060.0030.00.00.00.4330.435-0.060.2870.4340.7740.256-0.121-0.499-0.2190.0560.0750.2540.1180.072-0.0760.0170.090.0340.0540.0030.0350.0450.001-0.021-0.012
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▄▄█▄▃▂▅▃▃▄▃▄▃▃▆▄▃▃▃▃▃▃▂▁▃▃▅▄█▄█▃▄▃▃▄▃▃▄▃▃▃▄▄▃▄117.006111.432536.57499.31735.93-71.834267.37424.87945.189.992-52.488119.86813.41453.777368.0364.08959.13839.368-40.94640.33150.42941.45-64.361-235.26956.7384.872240.26168.125592.964145.896555.75137.60861.37929.24716.92995.68447.10259.99763.546-41.17137.04340.929147.59783.42233.2791.358
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService us-gaap:Product█▄▅▄▁▄▄▄▃▁226.892178.787191.605177.734136.825166.701177.137169.599153.129132.453NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService us-gaap:Service▃▁▃▂▂▆▅█▆▄306.983292.434309.364298.25298.578333.049325.222345.476326.756318.474NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▄▃▄▃▃▄▄▄▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▅▄▅▄▅▄▄▄▅▆▆█▆▆▇▇▇▇▇████763.561678.611740.81676.738646.994724.172733.166722.552679.639652.196613.505614.027607.051615.222608.701612.654607.726553.663520.09553.605554.793549.868548.556855.155790.676799.593779.121817.59784.144761.032783.375820.606928.801936.0451064.521935.413946.566955.007955.694980.679991.9041011.6091034.971049.6461030.5121038.928
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▅▅▆▄▄▃▅▄▄▄▄▅▄▄▄▄▄▄▄▄▄▄▄▁▄▄█▅▇▅▄▄▄▃▃▄▄▄▄▃▄▄▅▅▅▄158.926154.035317.743108.05460.762-79.291185.11758.16573.895109.30269.138135.0762.73556.56554.8638.24465.89923.78664.11840.92684.99960.61581.609-261.43590.92737.084524.258141.619446.185208.63382.39387.29675.53413.945-37.37576.09354.30321.851101.92213.14474.59627.966146.351145.067158.81587.884
us-gaap:IncomeTaxExpenseBenefit ▅▅▆▅▅▃▅▄▅▅▄▄▄▄▁▄▅▄▅▄▅▅▅▄▅▄█▅▆▆▅▅▅▄▄▅▅▄▅▅▅▄▆▅▅▅43.041.480.830.041.9-45.439.115.216.727.612.410.016.113.6-159.713.423.92.727.27.823.822.430.5-30.532.514.5191.958.276.877.426.731.030.47.38.031.220.110.541.816.627.59.168.159.656.432.4
us-gaap:InterestExpense ▂▂▇▂▂▂▂▁▂▂▁▁█▂▂▃▃▂▄▃▂▂▂▂▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂7.3538.44816.0087.2477.3777.6787.1926.7768.3867.4256.5316.13517.1658.0718.1038.6199.0358.12910.8578.6147.9717.9487.9757.839.6318.5219.8799.338.5578.828.8389.2219.0488.969.0648.7388.9799.1638.6388.6677.967.9617.6937.6337.5987.579
us-gaap:InterestIncomeExpenseNet █▆▁▇▇▇▇█▇▇██▁▇█▆▆▇▅▆▆▆▆▆▅▆▆▅▆▆▆▆▆▆▆▆▆▆▆▆▇▇▇▇▇▆-5.5-7.6-15.1-6.4-6.4-6.5-5.8-5.3-6.8-5.7-5.062-5.524-15.264-6.699-4.919-7.758-7.862-6.766-9.816-7.874-7.25-7.357-7.429-7.349-9.293-7.962-8.555-8.801-7.916-8.221-8.248-8.579-8.526-8.45-8.163-8.09-8.204-8.094-7.464-7.673-6.963-6.979-6.642-7.033-6.999-7.253
us-gaap:NetIncomeLoss ▃▃▄▃▃▂▄▃▃▃▃▄▃▃▄▃▃▃▃▃▃▃▃▁▃▃▅▃█▄▄▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃115.358112.45237.14177.61518.854-33.245145.88143.14557.08181.74856.685125.06446.56642.891214.17824.78441.99621.08636.91833.12660.76637.7851.169-230.84357.99321.026334.4176.56750.349132.524156.47330.34944.8815.162-45.43994.01852.03631.49861.714-5.98245.80315.61578.98761.15292.13545.84
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest █▁0.5680.185NA0.4390.008-0.6460.112-0.180.114-0.046NA0.0060.0690.074NA0.060.0030.0NA0.00.4330.435-0.060.2870.4340.7740.256-0.121-0.499-0.2190.0550.0750.2530.0970.064-0.0710.0110.070.0170.016-0.040.0140.002-0.076-0.008-0.012
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▃▃▄▃▃▂▄▃▃▃▃▄▃▃▄▃▃▃▃▃▃▃▃▁▃▃▅▃█▄▄▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃114.592111.698235.85777.17518.749-33.329145.09342.90456.75681.28356.434124.23646.25342.596214.17824.55341.60121.08636.91833.12660.76637.7851.169-230.84357.78220.606334.4176.351750.137132.098156.47330.14444.6754.718-45.43993.79651.81431.04761.714-6.20845.57315.15478.98760.92291.90445.379
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted ▅▅▇▅▄▃▅▄▄▅▄▅▄▄▆▄▄▄▄▄▄▄▄▁▄▄█▅█▅▄▄▄▄▃▄▄▄▄▄▄▄▅▅▅114.594111.699235.8677.17618.749-33.329145.09942.90656.75881.28656.436124.24146.25542.597212.17624.55441.60420.88436.56332.69759.96637.27151.039-231.33756.73220.748325.88481.58361.879128.83952.756.01644.6756.104-45.43944.74233.9710.8360.105-3.88846.98717.90478.14985.513101.496NA
us-gaap:OperatingIncomeLoss ▆▆▆▆▅▅▅▅▆▆▆▆▆▆▆▆▆▅▇▆▆▆▆▁▇▆█▆▇▆▇▆▇▅▅▆▆▅▇▆▆▆█▇█▇37.59133.84446.20140.2445.8778.08530.31216.26857.96340.00375.58260.73965.62644.21467.11644.57168.36129.054109.48968.03374.1451.87267.811-213.72388.89546.555146.22281.28194.48479.529105.52481.87393.0523.06-14.42575.92160.35317.469107.74551.96181.09352.003150.869137.914166.898103.103
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▃▃▇▃▃▂▅▃▃▃▂▃▃▃▅▃▃▃▂▃▃▃▂▃▃▃▂▃▁▃█▃▃▃▄▃▃1.08-1.203299.63121.26317.068-37.943121.357-18.086-12.0958.29-109.226-5.202-33.22110.812153.4739.24517.13918.282-77.8647.205-10.773.235-115.47-4.713-1.689-16.928-94.405-8.314-156.88613.591399.2237.18416.24523.98862.3041.737-4.945NANANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▂▂▅▂▂▂▂▂▂▂▁▂▂▂▂▂▂▂▁▁▂▂▂▁▂▂█▃▆▄▁▂▁▂▁▂▂▂▂▁▂▁▂▂▂▂16.1226.32203.5240.2228.12.688-3.7045.5561.22829.351-12.5593.1422.3339.187-2.641.9634.0690.849-28.513-18.22519.015.09621.262-40.45811.678-1.105387.34664.526268.114133.273-14.928.11-12.858-4.083-17.5724.163-1.168.5881.073-29.65-2.591-24.0322.15712.486-3.807-3.321
us-gaap:ProfitLoss ▃▃▄▃▃▂▄▃▃▃▃▄▃▃▄▃▃▃▃▃▃▃▃▁▃▃▅▃█▄▄▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃115.926112.635236.94378.05418.862-33.891146.01742.96557.19581.70256.738125.0746.63542.965214.5624.84441.99921.08636.91833.12661.19938.21551.109-230.55658.42721.8334.66676.439749.85132.305156.52830.42445.1345.259-45.37593.94752.04731.56861.731-5.96645.76315.62978.98961.07692.12745.828
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▃▂▃▃▂▃▃▃▃▂▂▂▂▂▂▂▂▁▂▁▂▁▁▂▄▄▅▅▄▄▄▅▆▅▆▆▆▅▆▆▇▆███▇801.152712.455787.011716.982652.871732.257763.478738.82737.602692.199689.087674.766672.677659.436675.817657.225676.087582.717629.579621.638628.933601.74616.367641.432879.571846.148925.343898.871878.628840.561888.899902.4791021.851959.1051050.0961011.3341006.919972.4761063.4391032.641072.9971063.6121185.8391187.561197.411142.031
us-gaap:Revenues ▃▂▃▃▂▃▃▃▃▂▂▂▂▂▂▂▂▁▂▁▂▁▁▂▄▄▅▅▄▄▄▅▆▅▆▆▆▅▆▆▇▆███▇801.152712.455787.011716.982652.871732.257763.478738.82737.602692.199689.087674.766672.677659.436675.817657.225676.087582.717629.579621.638628.933601.74616.367641.432879.571846.148925.343898.871878.628840.561888.899902.4791021.851959.1051050.0961011.3341006.919972.4761063.4391032.641072.9971063.6121185.8391187.561197.411142.031
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:Assets ███▆▅▅▆▅▄▄▂▃▂▂▃▂▂▁▁▁▁▁▁▂▇▅▅▅▄▆▆▃▃▃▃▃▃▃▃▃▃▃▄6576.5426518.426444.1195811.5135672.3175645.8255931.2365487.7465212.955197.2344764.0414873.7434730.9334760.9584937.8234619.9154508.4394416.1054432.674438.6454328.6394312.5254352.9514524.3296181.945525.395752.3195488.4365289.7065920.5625811.0465095.8814924.024876.5065105.0694966.454877.6024939.8235016.9864986.1525092.4945005.1315158.367NANANA
us-gaap:Liabilities ▆▆▆▅▅▅▆▅▃▃▁▁▁▁▂▂▂▂▂▂▁▁▁▂█▄▆▅▅▅▅▄▃▃▅▄▄▄▄▄▄▄▄2592.912645.7952665.7982552.9582447.072427.2042598.7852424.9322170.222193.8321842.9131893.681848.7931871.3652018.0712055.4591968.3491935.4771979.6791929.7961856.1591846.01836.2961938.4912969.4412370.8212579.132554.5192442.0512491.8542494.1972347.2212222.2322237.2022495.12305.8132274.8142295.0932397.0552363.9892365.6512288.8722325.744NANANA
us-gaap:LiabilitiesAndStockholdersEquity ███▆▅▅▆▅▄▄▂▃▂▂▃▂▂▁▁▁▁▁▁▂▇▅▅▅▄▆▆▃▃▃▃▃▃▃▃▃▃▃▄6576.5426518.426444.1195811.5135672.3175645.8255931.2365487.7465212.955197.2344764.0414873.7434730.9334760.9584937.8234619.9154508.4394416.1054432.674438.6454328.6394312.5254352.9514524.3296181.945525.395752.3195488.4365289.7065920.5625811.0465095.8814924.024876.5065105.0694966.454877.6024939.8235016.9864986.1525092.4945005.1315158.367NANANA
us-gaap:StockholdersEquity █▇▇▃▃▃▄▂▂▂▁3968.0863857.6253759.3023239.8133206.6683206.0553319.2393052.013032.8122993.5982916.782NANANANANANANANANANANA2490.6982562.4233178.863121.3653140.2992890.0572831.8733412.1953300.0672731.722684.7732615.2662586.028NANANA2601.8962604.1462708.8412697.9862814.364NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:AssetsCurrent ▅▆▆▄▃▃▅▄▄▃▄▄▄▄▅▄▄▅▆▅▅▄▆▇█▄▅▂▁▆▅▄▃▂▃▂▁▁▂▁▁▂▃1640.6131837.441774.1921519.0211408.3971449.0251663.4851534.2581485.271477.5351532.3421535.8671495.1571521.4361735.8041617.8591597.4251759.8911871.3461715.5771627.4131605.4891860.7221956.1312113.0341486.0861690.7031264.1171135.5861830.8171702.3871510.681365.8681275.9811453.7621278.1191164.7581173.5591245.6251181.9061205.2481217.6051361.898NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▁▂▃▂▂▁▂▁▁▁▂▂▂▂▃▃▃▄▄▄▄▄▅▆█▄▅▃▂▄▄▃▃▂▄▂▂▂▃▂▂▂▃▄▄▄114.802350.135413.991295.672260.247178.646200.165142.264171.969170.882253.256265.159288.593315.789390.014395.009432.147632.787648.885593.183600.34530.587754.207977.9911219.334619.367772.751441.786325.023642.833569.719440.81386.567300.652512.431305.654264.119294.991381.099311.159299.362329.17437.74577.875659.027533.87
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▁▄▅▃▃▂▂▁▂▂▃▃▃▄▅▅▅██▇█125.532372.619423.054311.253279.074201.639214.044157.407187.634191.125264.115276.735302.741328.185407.566416.412455.146657.342670.816621.194632.218NA774.952NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▄▄▅▂▁▃█▇▄▄▅▆▃▄█496.676495.443519.577458.562430.642485.229595.321582.944506.734503.753538.021544.487476.658499.202600.215NANANA591.854NANANA553.78NANANA538.532NANANA398.014NANANA379.355NANANA375.577382.418388.106356.361397.024NANANA
us-gaap:OtherAssetsCurrent ▁▁▁▁▁▂█▇▇▇▆▆▆▇▅▅▅▆▅▅▅▅▅▄▇▇▆▆▆▆▆▆▇▇▆▆▆▆▆▆▆▆▆7.6311.4270.9420.9760.93911.783105.59587.86388.74896.91682.72377.86478.72188.95666.25365.44368.01568.71760.73563.16264.14258.96553.43953.17194.42491.20281.46278.27779.92880.43177.01376.93684.22791.45482.69277.18178.71675.57870.93673.36680.42978.53168.637NANANA
us-gaap:Land NANA19.394NANANA17.489NANANA15.965NANANA16.19NANANA10.41NANANA10.41NANANA18.052NANANA32.618NANANA42.992NANANA41.093NANANA41.145NANANA
us-gaap:MachineryAndEquipmentGross NANA398.334NANANA370.218NANANA382.064NANANA387.914NANANA433.652NANANA438.388NANANA2357.264NANANA2289.966NANANA2617.344NANANA2479.823NANANA2401.128NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:PropertyPlantAndEquipmentGross NANA849.194NANANA834.701NANANA780.946NANANA744.13NANANA778.658NANANA750.975NANANA2817.841NANANA3011.399NANANA3406.469NANANA3271.449NANANA3192.517NANANA
us-gaap:LeaseholdImprovementsGross NANA229.512NANANA233.842NANANA206.17NANANA215.445NANANA209.612NANANA205.018NANANA214.119NANANA294.548NANANA314.555NANANA304.421NANANA308.863NANANA
us-gaap:ConstructionInProgressGross NANA25.301NANANA79.963NANANA68.064NANANA16.649NANANA36.728NANANA13.517NANANA71.156NANANA94.615NANANA66.734NANANA95.173NANANA91.33NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA470.908NANANA450.031NANANA487.861NANANA484.772NANANA544.994NANANA519.852NANANA1957.012NANANA2083.857NANANA2325.232NANANA-2119.059NANANA-1991.791NANANA
us-gaap:AmortizationOfIntangibleAssets ████████▇▇▇▇▆▆▇▆▆▃▄▃▃▃▂▂▂▂▂▄▁▁▂▁▁▂▄▂▂▂▃▅▄▃▃▃▄▃13.88913.93714.13814.1514.32714.16513.73113.57212.8813.0613.36212.26911.39910.38412.89710.92310.5316.8367.5116.626.2786.2625.124.5124.6774.7695.257.4063.363.0813.7312.8373.3133.7177.6115.14.54.2786.8199.37.46.8086.556.57.6046.516
us-gaap:PropertyPlantAndEquipmentNet ▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▅▅▆▆▆▆▆▆▇▇▇▇▇▇█████373.471375.862378.286379.01376.681382.408384.67370.882327.084319.408293.085271.56265.502258.694259.358259.809263.1243.33233.664225.673222.408224.986231.123203.113819.343823.376860.829870.182847.97845.868927.542910.6361031.7541045.671081.2371100.8851117.4211129.1311152.391149.0541168.5961178.9071200.726NANANA
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures ██▇▇▇████▇▇▇▆▆▆▆▃▃▃▃▃▃▃▃▃▂▁▁▁▁▁▂▂▁▁▁▁▁▁▁▂▂▂164.203169.203155.777157.529156.677167.628162.249163.986159.66140.127143.813142.756133.55131.887128.59122.16667.81260.28758.80664.81563.83460.58259.22953.19850.89836.1219.81121.97621.00620.95315.75432.99727.38622.06815.53525.21921.72119.32917.10125.4532.68729.22331.637NANANA
us-gaap:Goodwill █▆▆▆▆▅▅▅▅▅▄▅▄▅▄▄▄▃▃▃▃▃▂▁▅▅▅▅▅▄▄▄▄▅▅▆▅▆▆▆▆▅▅1653.6071485.1371484.751458.1941440.3791362.1911388.2791345.3931335.9611339.8221297.7121310.0751280.3571301.4841299.711299.2261279.8941179.4311122.9541150.4461153.9751180.9241017.513947.3561325.7611314.3511348.711353.0891348.7081241.9491288.6221293.4821288.4191309.6631317.9151406.931398.5031404.7831414.9971415.181463.1911390.2821376.357NANANA
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill ▂▂▂▂▂▂▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▇▇▇██▇█████▇▇▇▇▇█▇▇121.417121.05120.437117.841115.913116.172140.197144.477126.986128.55799.052114.752100.444103.916102.195109.901110.0693.20366.02668.7870.18973.77921.88514.645510.966510.966516.753572.209535.378519.128541.278541.478539.728539.728539.728525.833530.502530.753530.641530.741536.802530.864530.816NANANA
us-gaap:FiniteLivedIntangibleAssetsNet █▆▆▇▇▇▇▇▇███▇▇▇▇█▅▃▃▃▃▃▂▃▃▃▂▂▁▁▁▁▁▁▁▁▁▂▂▂▂▂264.408190.041204.646218.125231.887235.008233.481245.393237.675250.256263.261260.055236.597230.674237.976239.152248.337153.924107.939114.636100.658106.921107.19181.81486.8290.85496.94778.23161.73236.49439.58843.54238.53542.05345.57746.79450.78752.73754.62256.40459.02461.19761.242NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▇▇▇▇▇▇██▆▆▁444.082453.193462.56486.691481.589486.82526.417503.83361.603382.050.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent █▇▇▇▇▆▆▆▇▆▆▅▅▆▅▄▃▃▃▃▃▂▃▃▃▂▂▁▁▂▁▁▁▁▁▁▂▂▂▂▃▂▂157.029148.218146.77147.589140.954128.668128.479129.451142.146129.29117.83117.149113.45123.627102.04692.88475.73273.79173.09681.8185.71767.74175.31878.89172.53965.69165.25853.06647.74261.38350.3749.16153.02752.11346.49254.23256.44359.00464.34863.02272.25757.56956.938NANANA
us-gaap:EquitySecuritiesFvNi █▇▄▂▁▁▄▃▃▃▂▂▁751.44700.352573.102491.172431.808436.204585.08535.564518.099510.307496.39497.879452.917NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent ▄▄▅▄▂▂▄▃▃▂▄▃▃▂▅▂▃▂▄▁▃▁▂▁▄▂▃▃▂▁▄▃▃▂▄▄▄▄▄▆█▆█512.409492.625520.236500.335433.672433.666507.701477.522461.051422.38486.578448.24457.3435.498526.323446.076451.476444.677500.726406.185451.044399.127428.014410.192502.312414.155464.342462.86429.56393.962505.699478.827447.538444.972486.396493.04492.244492.88495.041575.416642.957580.228626.188NANANA
us-gaap:AccountsPayableCurrent 116.607NA106.215NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccruedIncomeTaxesCurrent ▅▄▃▃▂▁▃▄█▇▆▄▆▅▄8.2366.8915.144.4013.0290.6154.1216.66814.67312.02510.4967.23510.4638.5936.109NANANA0.0NANANA0.00.08.2311.235128.89550.17652.59155.2780.022.34115.0612.9920.726NANANA0.00.0NANA0.0NANANA
us-gaap:DebtCurrent NANA6.452NANANA82.17981.6979.3519.5686.366.5686.553406.6546.7266.7136.4926.1586.1286.498NANA0.03.07.5375.17146.37550.4653.7449.3893.1683.0223.1293.169243.3273.0433.1733.25112.9833.1073.219NA3.0NANANA
us-gaap:DividendsPayableCurrent ▄▄7.5537.553NA7.2597.5727.5860.07.3877.3887.3880.07.0717.1347.3190.07.0257.0817.10.06.7976.7976.820.06.71515.66915.6450.014.98314.98319.0510.00.2060.2130.2220.018.29918.46118.8830.018.392NANA0.0NANANA
us-gaap:LiabilitiesCurrent ▄▄▅▄▃▄▆▅▂▃▂▂▁█▄▂▁▂▃▁▁▁▁▂▄▃▆▆▄▅▄▅▃▃█▄▃▄▅▅▆▅▆902.602927.734949.646915.459818.104937.3791041.871988.961814.564829.756812.162804.2746.3871152.583878.612813.181755.224778.993818.961754.057744.343735.832725.149764.745903.744848.181050.7921014.549915.766981.416934.109993.962863.516870.051126.286905.032874.37912.172995.556998.0181044.529995.9061008.277NANANA
us-gaap:LongTermDebtCurrent ▁▁▁▁▁██4.2484.2386.4526.1045.85878.57582.179NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityCurrent █▇█████▇▇▇▁86.14384.74986.79788.21887.65289.10792.71478.11480.62882.4290.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent 256.677NA278.528NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:LongTermDebtNoncurrent ▄▄▄▄▄▄▄▄▄▄▄▄▄▁▄▄▄▄▄▄▄▄▄▄█▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃506.079506.091506.103509.282505.672430.317430.65420.535497.094500.238470.777473.06478.77491.079486.561486.242489.717487.186485.719490.91400.028399.914399.926399.822947.219399.645399.545398.298398.202403.16447.608448.067446.904453.726453.384453.471452.569453.128452.229450.071402.328396.76396.65NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▇█▇▁▁▁▂531.35549.418521.274407.429405.955406.943427.372NANANA309.033NANANA347.334NANANA361.846377.564403.89416.116403.316NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:OtherPostretirementBenefitPlansDefinedBenefitNANA4.79NANANA5.663NANANA7.124NANANA20.865NANANA21.859NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitNANA115.804NANANA109.746NANANA96.227NANANA104.244NANANA100.946NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MinorityInterest █▇▇▇▇▇█▇▆▆▁7.8267.2147.0916.8456.7486.7857.5576.9016.0425.9380.0NANANANANANANANANANANA0.00.00.00.00.4769.9370.3260.2690.2210.2930.3380.2780.19NANANA0.00.0NANA0.0NANANA
us-gaap:OtherLiabilitiesNoncurrent ▂▂▃▄▅▂▁▁▁▁▄▄▄▄▄▄▄▄▄▄▅▄▄▅▅▅▆▆▆▅▆▆▇▇▇█▇█▇▇███32.51136.59148.76862.47175.55231.4327.22327.39822.90722.74757.90159.26460.71663.71465.97767.58964.95667.8565.55467.45871.5170.52270.67873.18274.95882.53991.78988.8486.89384.4286.086.021102.837107.21109.774115.421112.108112.655107.741111.714114.764112.235119.036NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▇▇▇██▇██▆▆▁407.74419.131428.849454.902451.874440.732477.004462.868323.466337.6480.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA88.721NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA71.003NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA57.31NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA45.968NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA280.837NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:StockholdersEquity █▇▇▃▃▃▄▂▂▂▁3968.0863857.6253759.3023239.8133206.6683206.0553319.2393052.013032.8122993.5982916.782NANANANANANANANANANANA2490.6982562.4233178.863121.3653140.2992890.0572831.8733412.1953300.0672731.722684.7732615.2662586.028NANANA2601.8962604.1462708.8412697.9862814.364NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest █▇▇▅▅▅▅▄▄▄▃▃▃▃▃▂▁▁▁▁▁▁▁▂▄▄▄▃▃▅▅▂▂▂▂▂▂▂▂▂▂▂▃3975.9123864.8393766.3933246.6583213.4163212.843326.7963058.9113038.8542999.5362916.7822975.3572877.392884.9132915.1452560.6772536.3722480.5782452.9412508.7992472.482440.1332490.6982562.4233178.863121.3653140.7752899.9942832.1993412.4643300.2882732.0132685.1112615.5442586.2182642.7912584.8712626.8242601.8962604.1462708.8412697.9862814.364NANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassANANA0.964NANANA0.964NANANA0.964NANANA0.964NANANA0.964NANANA0.964NANANA0.975NANANA1.169NANANA1.219NANANA1.229NANANA1.241NANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassBNANA19.036NANANA19.036NANANA19.036NANANA19.036NANANA19.036NANANA19.036NANANA19.025NANANA18.831NANANA18.781NANANA18.771NANANA18.759NANANA
us-gaap:AdditionalPaidInCapital █████████▇█▇▇▇▇▇▇▇▇▇▇▇▇▆▄▄▄▄▃▃▃▂▂▁▁▁▁▁▂▁▁▁▁386.882385.257388.159386.506384.804383.237381.669379.923378.255376.639378.837376.412374.502372.836370.7368.505365.942363.361364.363360.515357.178360.229356.887345.074311.901302.205303.789296.108291.464289.402288.129261.751252.767244.176240.746248.937245.393250.469252.767249.948247.118244.466249.719NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▇▇▇▇▆▆▆▆▆▅▅▅▄▄▄▄▄▄▄▄▄▅▅▅▄▄▂▂▁▁▁▁▁▁▁▁▁▁▁▁7009.9716902.1666804.8226567.6766497.1666485.8936534.4276388.5466352.7876303.0946236.1256179.9486061.9326022.3155791.7245648.4795630.7435595.8265588.9425552.0195525.6895471.6985447.6775396.5086040.5395998.2416008.5065674.0965612.5184877.24782.7774626.3114596.1674551.4934546.7754665.0074589.2874555.7164561.9894500.2494524.6214497.6334520.332NANANA
us-gaap:TreasuryStockValue ██████▇▇▇▇█▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▂▂▂▂▂▂▂▂▂▂▂▁▁▁4051.9584051.9094056.9934038.0523977.7223948.4273920.1523918.3973918.2543918.2543922.0093914.0583897.3013881.7163802.8343787.4593752.223753.3773756.853738.0853737.5323729.7093648.5463629.3093628.4433635.6333645.4763648.0323648.3082487.4922490.3332476.6132477.2482477.2452474.3472481.7032458.6222393.1192398.1892329.5652281.6172271.5522157.826NANANA
us-gaap:MinorityInterest █▇▇▇▇▇█▇▆▆▁7.8267.2147.0916.8456.7486.7857.5576.9016.0425.9380.0NANANANANANANANANANANA0.00.00.00.00.4769.9370.3260.2690.2210.2930.3380.2780.19NANANA0.00.0NANA0.0NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue █▁1.6721.589NA1.7681.5671.568NA1.6691.6161.639NA1.9372.1622.325NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders █▁0.1520.126NA0.276NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▃▁▅▅▂▅▄▃▁▅▅▄▃▃▄▃▅▅▂▄▃▁▃▅▁▃▆▅▄▂▆▅▄▇▅▄▄▆▄▆▃▆█▆▇48.84623.999-30.227119.539108.94812.40392.8888.95921.247-37.92295.161121.3251.58718.95147.19889.28939.66791.901117.0678.72188.47446.994-41.30338.817123.161-45.87135.493148.426111.39677.055-19.762150.115123.49374.018181.704125.80385.69184.016129.72783.55130.65549.359150.249226.149138.582178.736
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▃▆▄▄▄▄▃▄▃▃▃▄▄▄▃▁▃▄▃▄▂▂▂▃▃█▄▃▄▆▃▃▄▃▃▄▃▃▄▃▄▃▃▄▄-247.218-63.29186.649-13.92917.099.561-34.285-101.549-27.023-73.878-79.702-107.133-32.599-11.53-31.549-75.345-235.129-99.996-26.51-101.18513.261-196.852-150.643-160.872-61.224-52.831313.28-10.892-87.27613.903144.056-75.203-52.087-42.167-96.94-53.751-16.202-61.15-57.866-33.904-124.146-44.812-79.502-75.51-27.452-27.408
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▄▃▃▃▄▄▄▄▄▄▃▃▃▄▃▄▄▄▄▃▃▃▃█▃▄▄▁▄▄▄▄▂▅▃▃▃▄▃▃▃▂▂▄▃-49.046-10.129-50.328-75.655-51.334-26.685-6.901-14.6823.28337.034-25.148-40.329-35.909-90.973-25.547-55.42-9.55-9.589-25.78786.612-29.045-74.857-31.611-112.248536.392-50.382-12.48-14.293-342.811-19.0324.115-22.89216.575-241.228122.045-33.41-98.243-112.237-1.467-32.01-37.946-115.538-176.48-238.806-19.775-56.111
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▁▅█▆▇▆▇▅▆▄▆▅▅▄▆▅▂▆▇▆-247.087-50.435111.80132.17977.435-12.40556.637-30.227-3.491-72.99-12.62-26.006-25.444-79.381-8.846-38.734-202.196-13.47449.622-11.024NANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:DeferredIncomeTaxExpenseBenefit ▇█▇▇▇▆█▇▇▇▇▆▇▆▁▇23.54529.31115.110.61620.201-21.5543.44112.8297.5895.8923.744-6.7273.296-7.436-162.7581.936NANANANANANANANANANANANANANANANANANANANANANA17.62712.5198.499-3.70158.447-0.573-12.246-8.572
us-gaap:IncreaseDecreaseInAccountsReceivable ▅▄▇▆▃▂▅▇▅▄▅▆▅▂█▅▅▁▇▆▅▄▇▆▆▃█▆▅▄▇▇▅▄▅▆▅▄▅▅▅▃▅▆▅▄-13.345-25.19677.97825.008-63.582-100.7326.29474.4893.375-30.556-4.64723.8078.304-87.31195.14415.8920.483-122.60553.87243.806-8.037-41.74966.68547.4332.791-59.74183.97745.296-8.931-23.49849.27262.325-6.588-23.022.86244.723.98-36.71610.944.5411.073-54.448-5.09318.415-1.569-26.401
us-gaap:IncreaseDecreaseInInventories ▂█▃▅▁▇▂▁█▇▃▃▇▆-6.52211.493-3.7352.789-11.3528.512-6.652-9.90913.0718.807-3.562-3.1968.685.429NANANANANANANANANANANANA0.435NANANA0.2871.9080.612-3.6583.561-1.7922.118-2.016-0.681-0.893.762-0.604-0.654-3.4590.431-4.889
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▃▆▆▄▄█▆▆▆█▄▃▃▇▅▄▄▅▄▄▄▅▃▃▅▅▅▇▁▂▆▅▂▆▄▄▂▅▃▆▃▇█▂▄▄-11.53820.88129.2354.427-1.40247.48325.33922.66228.92445.3273.216-10.223-7.20641.18615.6742.37-2.0649.489-4.2271.0336.2729.187-9.089-7.19510.89817.3588.48737.559-33.301-21.53628.41116.935-17.80824.202-3.835-3.168-17.10914.817-13.81622.724-6.01434.85445.687-22.031-4.106-0.12
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▃▁▅▅▂▅▄▃▁▅▅▄▃▃▄▃▅▅▂▄▃▁▃▅▁▃▆▅▄▂▆▅▄▇▅▄▄▆▄▆▃▆█▆▇48.84623.999-30.227119.539108.94812.40392.8888.95921.247-37.92295.161121.3251.58718.95147.19889.28939.66791.901117.0678.72188.47446.994-41.30338.817123.161-45.87135.493148.426111.39677.055-19.762150.115123.49374.018181.704125.80385.69184.016129.72783.55130.65549.359150.249226.149138.582178.736
us-gaap:NetIncomeLoss ▃▃▄▃▃▂▄▃▃▃▃▄▃▃▄▃▃▃▃▃▃▃▃▁▃▃▅▃█▄▄▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃115.358112.45237.14177.61518.854-33.245145.88143.14557.08181.74856.685125.06446.56642.891214.17824.78441.99621.08636.91833.12660.76637.7851.169-230.84357.99321.026334.4176.56750.349132.524156.47330.34944.8815.162-45.43994.01852.03631.49861.714-5.98245.80315.61578.98761.15292.13545.84
us-gaap:ProfitLoss ▃▃▄▃▃▂▄▃▃▃▃▄▃▃▄▃▃▃▃▃▃▃▃▁▃▃▅▃█▄▄▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃115.926112.635236.94378.05418.862-33.891146.01742.96557.19581.70256.738125.0746.63542.965214.5624.84441.99921.08636.91833.12661.19938.21551.109-230.55658.42721.8334.66676.439749.85132.305156.52830.42445.1345.259-45.37593.94752.04731.56861.731-5.96645.76315.62978.98961.07692.12745.828
us-gaap:ShareBasedCompensation ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▄█▃▂▂▃1.5751.4851.591.6231.5671.5681.5261.5251.6161.6111.241.911.1512.1112.6412.3242.3382.8663.0993.1673.8983.2549.6124.588.8265.0174.4547.023NANA-9.266NANANA4.092NANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▃▆▄▄▄▄▃▄▃▃▃▄▄▄▃▁▃▄▃▄▂▂▂▃▃█▄▃▄▆▃▃▄▃▃▄▃▃▄▃▄▃▃▄▄-247.218-63.29186.649-13.92917.099.561-34.285-101.549-27.023-73.878-79.702-107.133-32.599-11.53-31.549-75.345-235.129-99.996-26.51-101.18513.261-196.852-150.643-160.872-61.224-52.831313.28-10.892-87.27613.903144.056-75.203-52.087-42.167-96.94-53.751-16.202-61.15-57.866-33.904-124.146-44.812-79.502-75.51-27.452-27.408
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▁▁▁▁▁▂▂▂▂▃▄▂▂▂▂▁▁▁▂▂▁▁▂▂▅▄▇▇▅▃█▅▅▃▆▅▅▄▇▅▅▄█▇▅▃14.38913.11313.4715.91214.97425.23517.79223.00924.45128.25239.34218.34423.017.50616.49513.91614.28315.66425.23919.17111.51210.6916.84119.77852.64547.59574.85169.81456.06536.56280.79555.64651.1936.46265.60454.56152.95544.87570.75952.7853.56739.27584.54574.33249.80735.028
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▄▃▃▃▄▄▄▄▄▄▃▃▃▄▃▄▄▄▄▃▃▃▃█▃▄▄▁▄▄▄▄▂▅▃▃▃▄▃▃▃▂▂▄▃-49.046-10.129-50.328-75.655-51.334-26.685-6.901-14.6823.28337.034-25.148-40.329-35.909-90.973-25.547-55.42-9.55-9.589-25.78786.612-29.045-74.857-31.611-112.248536.392-50.382-12.48-14.293-342.811-19.0324.115-22.89216.575-241.228122.045-33.41-98.243-112.237-1.467-32.01-37.946-115.538-176.48-238.806-19.775-56.111
us-gaap:RepaymentsOfLongTermDebt █▁1.0371.034NA0.63574.3590.847NA6.895NANANANANANANANANANANANANANANA2.472NANANA0.01NANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock NANA38.67460.2529.29533.612.1030.00.00.07.18216.75615.09179.00115.37634.9990.00.39518.621.2667.71681.34622.9790.00.00.00.00.0327.7180.00.00.00.04.1965.65123.07374.3360.13668.60147.93410.125121.395127.763233.57115.65427.828
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType ghc:FivePointSevenFivePercentUnsecuredNotesdueJune12026NANA5.75e-06NA5.7500000000000005e-085.7500000000000005e-085.7500000000000005e-085.7500000000000005e-085.7500000000000005e-08NA5.7500000000000005e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-03
Value0.9640.9640.9640.9640.9640.9640.9751.1691.2191.2291.2411.292
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassB


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-03
Value191919191919191818181818
Percentage of CommonStockValue1974.71974.71974.71974.71974.71974.71951.31610.91540.71527.31511.61448.0
Percentage of Assets0.30.30.40.40.40.40.30.30.40.40.40.4
Percentage of Assets us-gaap:CommonClassB0.00.00.00.00.00.00.00.00.00.00.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value4985000.04977000.05072000.05201000.05274000.05329000.05329000.05326000.05337000.05362000.05473000.05554000.05577000.05569000.05574000.05574000.05652000.05738000.05750000.05737000.05696000.07308000.07301000.07347000.07337000.07283000.07266000.07223000.07376000.07545000.07615000.07682000.07802000.07933000.08119000.08385000.08904000.09193000.09241000.0
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value4968000.04967000.04970000.05060000.05196000.05274000.05284000.05285000.05285000.05284000.05270000.05302000.05325000.05436000.05473000.05518000.05539000.05535000.05527000.05544000.05544000.05623000.05746000.05738000.05720000.05704000.05678000.05671000.07284000.07275000.07266000.07231000.07229000.07227000.07223000.07272000.07431000.07514000.07601000.07802000.07852000.08046000.08336000.08839000.09126000.09175000.0
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:RestrictedStock


Antidilutive
Period End2021-06-302020-06-30
Value13000.010000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value23.0722.4947.4515.253.61-6.3227.458.1210.7415.3810.6923.438.697.8438.764.457.513.776.65.910.826.638.78-40.259.923.5157.7113.18100.817.8521.24.076.020.64-6.5712.646.844.078.03-0.825.741.879.426.8510.04.91
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value22.9922.4447.3415.223.6-6.3227.258.0510.6515.2610.6123.288.637.7838.524.427.463.756.575.8710.766.598.72-40.259.873.4857.4113.12100.4817.7921.144.056.020.64-6.5712.646.844.078.03-0.825.741.879.426.8410.04.91
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value1161115369835-71.188267254490-52.5411191353367645939-40.9464049415553761291695475963-41.2253740147833391
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.515.668.213.85.5-9.735.03.46.113.0-7.617.82.08.154.49.78.76.8-6.56.57.96.862.54.26.03.01.69.54.76.26.0-4.03.53.812.47.02.88.0

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value568000.0185000.0-198000.0439000.08000.0-646000.0136000.0-180000.0114000.0-46000.053000.06000.069000.074000.0382000.060000.03000.0000433000.0435000.0-60000.0287000.0434000.0774000.0256000.0-121000.0-499000.0-219000.056000.075000.0254000.0118000.072000.0-76000.017000.090000.034000.054000.03000.035000.045000.01000.0-21000.0-12000.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.0-0.00.10.0-0.10.0-0.00.0-0.00.00.00.00.00.10.00.00.00.00.00.10.1-0.00.00.00.10.0-0.0-0.1-0.00.00.00.00.00.0-0.00.00.00.00.00.00.00.00.0-0.0-0.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value1171115369935-71.834267244589-52.4881191353368645939-40.946405041-64.361-235.269564.872240685921455553761291695475963-41.1713740147833391
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.615.668.213.95.5-9.835.03.46.113.0-7.617.82.08.254.59.88.76.8-6.56.58.06.9-10.4-36.76.50.626.07.667.517.462.54.26.03.01.69.54.76.26.0-4.03.53.812.47.02.88.0

Cost Of Goods And Service Excluding Depreciation Depletion And Amortization

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization

us-gaap:Product


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value226178191177136166177169153132
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.325.124.324.821.022.823.223.020.819.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Product78.278.185.879.180.877.376.778.377.475.5

us-gaap:Service


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value306292309298298333325345326318
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization135.3163.6161.5167.8218.2199.8183.6203.7213.4240.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.341.039.341.645.745.542.646.844.346.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Service60.160.554.960.661.764.561.166.260.661.6

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value763678740676646724733722679652613614607615608612607553520553554549548855790799779817784761783820928936106493594695595598099110111034104910301038
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax95.395.294.194.499.198.996.097.892.194.289.091.090.293.390.193.289.995.082.689.188.291.489.0133.389.994.584.291.089.290.588.190.990.997.6101.492.594.098.289.995.092.495.187.388.486.191.0

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value15815431710860-79.2911855873109691356256543865236440846081-261.435903752414144620882877513-37.37576542110113742714614515887
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.821.640.415.19.3-10.824.27.910.015.810.020.09.38.68.15.89.74.110.26.613.510.113.2-40.810.34.456.715.850.824.89.39.77.41.5-3.67.55.42.29.61.37.02.612.312.213.37.7

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value4341803041-45.4391516271210.01613-159.713232.7277.8232230-30.532141915876772631307.38.03120104116279.168595632
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.45.810.34.26.4-6.25.12.12.34.01.81.52.42.1-23.62.03.50.54.31.33.83.74.9-4.83.71.720.76.58.79.23.03.43.00.80.83.12.01.13.91.62.60.95.75.04.72.8

us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.00.00.0060.0070.0110.0110.0140.0150.0120.0110.009-0.001-0.005-0.011-0.008
Percentage of IncomeTaxExpenseBenefit0.00.00.0-0.00.00.10.10.10.10.10.1-0.00.0-0.1-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value7.3538.448167.2477.3777.6787.1926.7768.3867.4256.5316.135178.0718.1038.6199.0358.129108.6147.9717.9487.9757.839.6318.5219.8799.338.5578.828.8389.2219.0488.969.0648.7388.9799.1638.6388.6677.967.9617.6937.6337.5987.579
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.22.01.01.11.00.90.91.11.10.90.92.61.21.21.31.31.41.71.41.31.31.31.21.11.01.11.01.01.01.01.00.90.90.90.90.90.90.80.80.70.70.60.60.60.7

us-gaap:InterestExpense us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.1530.1540.1610.1660.1180.0290.005-0.024-0.058-0.069-0.062-0.059-0.0450.0030.0290.0510.041
Percentage of InterestExpense2.11.81.02.31.60.40.1-0.4-0.7-0.9-0.9-1.0-0.30.00.40.60.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms, us-gaap:StatementBusinessSegments

us-gaap:SecuritiesSubjectToMandatoryRedemption, ghc:GrahamHealthcareGroup


Interest
Period End2021-03-312018-06-30
Value1.16.2
Percentage of InterestExpense13.036.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:SecuritiesSubjectToMandatoryRedemption ghc:GrahamHealthcareGroup0.00.0

Interest Income Expense Net

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestIncomeExpenseNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-5500000.0-7600000.0-15100000.0-6400000.0-6400000.0-6500000.0-5800000.0-5300000.0-6800000.0-5700000.0-5062000.0-5524000.0-15264000.0-6699000.0-4919000.0-7758000.0-7862000.0-6766000.0-9816000.0-7874000.0-7250000.0-7357000.0-7429000.0-7349000.0-9293000.0-7962000.0-8555000.0-8801000.0-7916000.0-8221000.0-8248000.0-8579000.0-8526000.0-8450000.0-8163000.0-8090000.0-8204000.0-8094000.0-7464000.0-7673000.0-6963000.0-6979000.0-6642000.0-7033000.0-6999000.0-7253000.0
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.7-1.1-1.9-0.9-1.0-0.9-0.8-0.7-0.9-0.8-0.7-0.8-2.3-1.0-0.7-1.2-1.2-1.2-1.6-1.3-1.2-1.2-1.2-1.1-1.1-0.9-0.9-1.0-0.9-1.0-0.9-1.0-0.8-0.9-0.8-0.8-0.8-0.8-0.7-0.7-0.6-0.7-0.6-0.6-0.6-0.6

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value1151122377718-33.2451454357815612546422142441213633603751-230.84357213347675013215630445.162-45.43994523161-5.982451578619245
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.415.830.110.82.9-4.519.15.87.711.88.218.56.96.531.73.86.23.65.95.39.76.38.3-36.06.62.536.18.585.415.817.63.44.40.5-4.39.35.23.25.8-0.64.31.56.75.17.74.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value568000.0185000.0439000.08000.0-646000.0112000.0-180000.0114000.0-46000.06000.069000.074000.060000.03000.000433000.0435000.0-60000.0287000.0434000.0774000.0256000.0-121000.0-499000.0-219000.055000.075000.0253000.097000.064000.0-71000.011000.070000.017000.016000.0-40000.014000.02000.0-76000.0-8000.0-12000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.10.0-0.10.0-0.00.0-0.00.00.00.00.00.00.00.00.10.1-0.00.00.00.10.0-0.0-0.1-0.00.00.00.00.00.0-0.00.00.00.00.0-0.00.00.0-0.0-0.0-0.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value1141112357718-33.3291454256815612446422142441213633603751-230.84357203347675013215630444.718-45.43993513161-6.208451578609145
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.315.730.010.82.9-4.619.05.87.711.78.218.46.96.531.73.76.23.65.95.39.76.38.3-36.06.62.436.18.585.415.717.63.34.40.5-4.39.35.13.25.8-0.64.21.46.75.17.74.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-04
Value1141112357718-33.3291454256815612446422122441203632593751-231.3375620325813611285256446.104-45.43944331060-3.88846177885101
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.315.730.010.82.9-4.619.05.87.711.78.218.46.96.531.43.76.23.65.85.39.56.28.3-36.16.42.535.29.141.215.35.96.24.40.6-4.34.43.41.15.7-0.44.41.76.67.28.5

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value373346405.8778.08530165740756065446744682910968745167-213.7238846146819479105819323-14.425756017107518152150137166103
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.74.85.95.60.91.14.02.27.95.811.09.09.86.79.96.810.15.017.410.911.88.611.0-33.310.15.515.89.010.89.511.99.19.12.4-1.47.56.01.810.15.07.64.912.711.613.99.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-14.57-14.78-17.647-12.739-13.02-8.572-11.665-12.03-13.238-14.224-13.276-12.887-12.756-13.942-14.955.2655.094.618243.3422.0951.8940.949-8.413
Percentage of OperatingIncomeLoss-38.8-43.7-38.2-31.7-221.5-106.0-38.5-73.9-22.8-35.6-17.6-21.2-19.4-31.5-22.311.87.415.922.14.92.83.71.43.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.8-2.1-2.2-1.8-2.0-1.2-1.5-1.6-1.8-2.1-1.9-1.9-1.9-2.1-2.20.80.80.83.80.50.30.30.2-1.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1318-8.6753.333124.6923.333-7.1612625142237222113329.0312916321426-242.77715-22.8493312102.522141723-4.056
Percentage of OperatingIncomeLoss35.056.0-18.88.3208.558.011.0-44.045.464.019.336.757.251.331.530.048.231.127.324.044.427.938.8113.617.8-49.122.915.411.23.213.820.825.5-17.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.62.7-1.10.51.90.60.4-1.03.63.72.13.35.63.43.12.04.91.54.82.65.22.44.3-37.81.8-2.73.61.41.20.31.61.92.3-0.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education3.95.80.01.13.71.30.0-2.07.26.94.26.210.16.05.63.68.52.40.04.27.83.60.0-50.43.0-4.66.12.31.90.52.63.14.3-0.8

us-gaap:OperatingSegments, ghc:GrahamHealthcareGroup


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value8.5957.145.9788.1428.8183.1691.7731.2082.5982.3290.928-8.7020.764-1.391-2.9470.920.384
Percentage of OperatingIncomeLoss22.921.112.920.2150.039.25.87.44.55.81.2-14.31.2-3.1-4.42.10.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.00.81.11.40.40.20.20.40.30.1-1.30.1-0.2-0.40.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:GrahamHealthcareGroup15.714.30.015.817.96.90.03.06.46.22.4-24.52.0-3.70.02.31.0

us-gaap:OperatingSegments, ghc:Manufacturing


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value128.9072.4584.851-1.4826.5015.6566.8454.6923.2746.4125.1468.6658.628
Percentage of OperatingIncomeLoss33.126.35.312.1-25.280.418.742.18.18.28.58.513.219.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.61.30.30.7-0.20.90.70.90.60.50.90.81.31.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Manufacturing8.87.70.04.5-1.85.70.06.14.12.85.44.16.97.3

us-gaap:OperatingSegments, ghc:TelevisionBroadcasting


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value35328252233535364435735541403932392555594441434042385444444443323929
Percentage of OperatingIncomeLoss94.797.4178.2131.1402.0442.5118.2226.376.888.897.191.362.791.758.973.957.489.451.087.059.679.564.6-19.047.382.837.255.346.755.841.740.142.2126.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.44.610.57.43.64.94.75.06.05.110.78.26.16.15.95.05.84.58.99.57.06.97.16.34.84.65.95.05.05.34.93.63.83.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:TelevisionBroadcasting29.729.00.039.423.431.00.032.038.232.848.142.736.037.335.632.537.028.40.052.645.844.80.045.246.346.153.151.449.951.851.344.748.942.2

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-17.613-19.337-18.263-16.088-21.316-29.692-6.694-9.029-2.196-9.237-5.844.613-1.054-3.6953.751-7.033-8.918-10.564-0.509-10.801-5.062-5.73-3.285-3.059
Percentage of OperatingIncomeLoss-46.9-57.1-39.5-40.0-362.7-367.2-22.1-55.5-3.8-23.1-7.77.6-1.6-8.45.6-15.8-13.0-36.4-0.5-15.9-6.8-11.0-4.81.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.2-2.7-2.3-2.2-3.3-4.1-0.9-1.2-0.3-1.3-0.80.7-0.2-0.60.6-1.1-1.3-1.8-0.1-1.7-0.8-1.0-0.5-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:AllOtherSegments-12.1-18.60.00.0-24.5-29.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:HigherEducation, us-gaap:ReportableSubsegments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2.3746.2532.4816.85317-2.024.1475.1772.7211.915-3.3996.042111.355-0.368.809171216111721273.153240.593435.39120132914225.101
Percentage of OperatingIncomeLoss6.318.55.417.0290.1-25.013.731.84.74.8-4.59.917.13.1-0.519.825.943.415.216.923.241.139.9-1.527.91.329.86.622.216.527.718.024.222.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.90.31.02.6-0.30.50.70.40.3-0.50.91.70.2-0.11.32.62.22.61.82.73.54.40.52.80.14.70.62.41.63.31.62.20.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:HigherEducation us-gaap:ReportableSubsegments3.08.30.08.219.7-2.70.06.63.62.30.06.813.01.4-0.36.612.78.70.07.710.912.90.01.510.30.20.02.28.35.20.05.58.31.9

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanInternational, us-gaap:ReportableSubsegments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1410-6.008-13.75916186.533-14.2262524178.3752420225.348157.707251.561164.897208.295177.7172813171029126.496.397
Percentage of OperatingIncomeLoss37.430.2-13.0-34.2272.8234.821.6-87.444.160.723.013.836.946.133.712.023.326.523.32.322.29.429.6-3.919.816.619.517.019.013.728.214.87.027.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.81.4-0.8-1.92.52.60.9-1.93.53.52.51.23.63.13.30.82.41.34.00.32.60.83.31.32.00.93.11.52.01.33.31.30.60.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:KaplanInternational us-gaap:ReportableSubsegments7.85.90.0-11.19.79.50.0-8.013.513.10.05.013.111.111.93.19.34.70.01.09.02.90.04.38.84.00.06.78.45.40.06.13.53.5

us-gaap:OperatingSegments, ghc:Education, ghc:ProfessionalU.S., us-gaap:ReportableSubsegments


Operating
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5.7211.3786.1266.1454.9394.745117.7456.7684.789.3155.5137.3164.57110
Percentage of OperatingIncomeLoss14.223.475.820.330.48.228.110.211.17.321.18.216.46.735.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.20.80.80.70.61.61.11.00.71.40.81.10.71.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:ProfessionalU.S. us-gaap:ReportableSubsegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, ghc:Education, ghc:SupplementalEducation, us-gaap:ReportableSubsegments


Operating
Period End2021-06-302021-03-312020-06-302020-03-31
Value8.813120.33-6.55
Percentage of OperatingIncomeLoss23.436.95.6-81.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.80.1-0.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:SupplementalEducation us-gaap:ReportableSubsegments11.315.70.4-8.1

us-gaap:OperatingSegments, ghc:Education, ghc:TestPreparation, us-gaap:ReportableSubsegments


Operating
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value13-1.048-12.676-1.3954.9594.289-0.4541.883106.120.5211.37.335.741-2.864-3.7158.5887.036-2.310.433137.079-4.334-1.1786.98-3.904-6.628-3.1883.827.831-4.345
Percentage of OperatingIncomeLoss33.2-17.8-156.8-4.630.57.4-1.12.517.49.31.21.916.48.4-9.9-3.412.69.5-4.50.6-6.48.0-9.3-0.88.6-4.1-8.3-3.04.78.4-18.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.9-0.2-1.7-0.20.70.6-0.10.31.60.90.10.21.10.8-0.5-0.61.41.1-0.40.12.10.8-0.5-0.10.8-0.4-0.8-0.40.40.8-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:TestPreparation us-gaap:ReportableSubsegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanCorporateAndOther


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-12.115-10.119-12.004-8.83-21.161-5.723-12.094-8.011-10.99-11.404-8.954-9.452-8.763-8.895-8.124-8.037-6.451-8.469-8.442-5.31-7.811
Percentage of OperatingIncomeLoss-32.2-29.9-26.0-21.9-360.1-70.8-39.9-49.2-19.0-28.5-11.8-15.6-13.4-20.1-12.1-18.0-9.4-29.1-7.7-7.8-10.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.5-1.4-1.5-1.2-3.2-0.8-1.6-1.1-1.5-1.6-1.3-1.4-1.3-1.3-1.2-1.2-1.0-1.5-1.3-0.9-1.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:KaplanCorporateAndOther-335.1-300.90.0-276.5-696.3-178.60.0-327.0-463.9-495.40.0-6609.8-1982.6-3121.1-4669.0-16402.0-11317.5-60492.90.0-11297.9-43394.4

us-gaap:OperatingSegments, ghc:Education, us-gaap:IntersubsegmentEliminations


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.0010.0980.00.00.00.005-0.0030.0010.003-0.006-0.004-0.0430.0110.00.179-0.059-0.030.0530.020.0-0.0490.00.0010.0370.0260.032-0.109-0.0220.0920.044-0.0460.1560.0940.131
Percentage of OperatingIncomeLoss-0.00.30.00.00.00.1-0.00.00.0-0.0-0.0-0.10.00.00.3-0.1-0.00.20.00.0-0.10.00.0-0.00.00.1-0.1-0.00.10.1-0.00.20.10.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.00.00.00.00.0-0.00.00.0-0.0-0.0-0.00.00.00.0-0.0-0.00.00.00.0-0.00.00.00.00.00.0-0.0-0.00.00.0-0.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education us-gaap:IntersubsegmentEliminations0.1-7.60.0-0.0-0.0-0.40.0-0.2-1.00.80.08.1-2.9-0.0-27.99.212.6-9.50.0-0.010.7-0.00.0-38.5-19.3-24.20.012.3-18.4-15.20.0-27.5-49.7-32.3

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1.08-1.2032992117-37.943121-18.086-12.0958.29-109.226-5.202-33.22110153391718-77.8647.205-10.773.235-115.47-4.713-1.689-16.928-94.405-8.314-156.886133997.1841623621.737-4.945
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-0.238.13.02.6-5.215.9-2.4-1.61.2-15.9-0.8-4.91.622.76.02.53.1-12.41.2-1.70.5-18.7-0.7-0.2-2.0-10.2-0.9-17.91.644.90.81.62.55.90.2-0.5

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-0.097-1.1942670.7120.7730.6596-1.053-1.026-1.384-96.049-2.353-2.355-0.943130-0.869-0.869-1.022-90.9090.2370.2360.237-130.227-2.4920.4190.419-95.134-4.515-4.516-4.371
Percentage of OtherComprehensiveIncomeLossNetOfTax-9.099.389.23.34.5-1.779.65.88.5-16.787.945.27.1-8.784.9-2.2-5.1-5.6116.83.3-2.27.3112.852.9-24.8-2.5100.854.32.9-32.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.234.00.10.10.112.6-0.1-0.1-0.2-13.9-0.3-0.4-0.119.3-0.1-0.1-0.2-14.40.00.00.0-21.1-0.40.00.0-10.3-0.5-0.5-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.010.4770.2170.121-0.11-1.217-0.328-0.3490.035-0.359-0.04-0.0050.3010.1910.265-0.058-0.015
Percentage of OtherComprehensiveIncomeLossNetOfTax0.9-39.70.10.6-0.63.2-0.31.9-0.3-4.30.00.1-0.91.80.2-0.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.10.00.0-0.0-0.2-0.0-0.00.0-0.1-0.0-0.00.00.00.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1.08-1.2032117-37.943-18.086-12.0958.29-5.202-33.22110
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-0.23.02.6-5.2-2.4-1.61.2-0.8-4.91.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1.167-0.486322016-37.37625-16.684-11.10410-13.137-2.844-31.16711-1.464119.63813-20.52-0.353-5.1213.845-1.511-4.5224.765-12.129-9.354-9.7771.920.746
Percentage of OtherComprehensiveIncomeLossNetOfTax108.140.410.796.196.198.520.792.291.8121.012.054.793.8107.0-1.029.256.274.826.4-4.947.5118.91.395.9-282.171.79.9117.6-1.25.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-0.14.12.82.5-5.13.3-2.3-1.51.4-1.9-0.4-4.61.8-0.21.71.42.3-3.3-0.1-0.80.6-0.2-0.70.5-1.4-1.0-1.10.20.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value1.08-1.2032992117-37.943121-18.086-12.0958.29-109.226-5.202-33.22110153391718-77.8647.205
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-0.238.13.02.6-5.215.9-2.4-1.61.2-15.9-0.8-4.91.622.76.02.53.1-12.41.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value166.322030.2228.12.688-3.7045.5561.22829-12.5593.1422.3339.187-2.641.9634.0690.849-28.513-18.225191521-40.45811-1.10538764268133-14.928.11-12.858-4.083-17.5724.163-1.168.5881.073-29.65-2.591-24.0322.15712-3.807-3.321
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.00.925.90.01.20.4-0.50.80.24.2-1.80.50.31.4-0.40.30.60.1-4.5-2.93.02.53.4-6.31.3-0.141.97.230.515.9-1.70.9-1.3-0.4-1.70.4-0.10.90.1-2.9-0.2-2.30.21.1-0.3-0.3

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value1151122367818-33.8911464257815612546422142441213633613851-230.55658213347674913215630455.259-45.37593523161-5.966451578619245
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.515.830.110.92.9-4.619.15.87.811.88.218.56.96.531.73.86.23.65.95.39.76.48.3-35.96.62.636.28.585.315.717.63.44.40.5-4.39.35.23.25.8-0.64.31.56.75.17.74.0

us-gaap:ProfitLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-0.0561.04-0.872-0.878-0.897-0.686651.0661.071.438252.4012.3910.9410.7080.8290.8360.9975.664-0.235
Percentage of ProfitLoss-0.00.9-0.4-1.1-4.82.045.22.51.91.844.91.95.12.20.33.32.04.715.3-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.1-0.1-0.1-0.1-0.18.60.10.10.23.70.40.40.10.10.10.10.20.9-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-0.153-0.154-0.161-0.166-0.124-0.036-0.0160.0130.0440.0540.050.0480.036-0.002-0.024-0.04-0.033
Percentage of ProfitLoss-0.1-0.1-0.1-0.2-0.70.1-0.00.00.10.10.10.00.1-0.0-0.0-0.2-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.00.00.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1151127818-33.8914257811254642
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.515.810.92.9-4.65.87.811.818.56.96.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value801712787716652732763738737692689674672659675657676582629621628601616641879846925898878840888902102195910501011100697210631032107210631185118711971142
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.516-0.529-0.451-0.525-0.349-0.303-0.359-0.224-0.044-0.04-0.0550.0-0.021-0.024-0.0510.00.00.00.00.0-0.069-0.07-0.057-0.0590.00.00.00.0-0.03-0.098-0.039-0.049-0.076-0.077
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.00.0-0.0-0.0-0.00.00.00.00.00.0-0.0-0.0-0.0-0.00.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.00.0-0.0-0.0-0.00.00.00.00.00.0-0.0-0.0-0.0-0.00.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value339329313302333356354357367372346358370375380376386372391386419401421481523500551543547526555546548527
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax42.446.239.942.251.048.746.448.449.953.850.353.155.056.956.357.357.264.062.162.266.766.768.475.159.559.259.660.562.362.662.460.653.755.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax42.446.239.942.251.048.746.448.449.953.850.353.155.056.956.357.357.264.062.162.266.766.768.475.159.559.259.660.562.362.662.460.653.755.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:GrahamHealthcareGroup


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value5450515149454240403737353837384038
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.87.06.67.27.56.35.65.55.55.55.55.35.75.75.76.25.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.87.06.67.27.56.35.65.55.55.55.55.35.75.75.76.25.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:GrahamHealthcareGroup100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:Manufacturing


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value14111511210683113107111114115117126126117
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.616.314.314.912.715.514.115.115.616.617.118.718.817.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.616.314.314.912.715.514.115.115.616.617.118.718.817.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Manufacturing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:TelevisionBroadcasting


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1191131751331001151231151161081521301141081111011069110811296929589908310287888585738068
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.015.922.318.715.415.816.215.615.815.622.219.317.016.516.415.415.715.717.318.115.315.315.414.010.39.911.19.710.010.29.68.17.97.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.015.922.318.715.415.816.215.615.815.622.219.317.016.516.415.415.715.717.318.115.315.315.414.010.39.911.19.710.010.29.68.17.97.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:TelevisionBroadcasting100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value14510486101
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.214.613.313.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.214.613.313.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:AllOtherSegments100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:HigherEducation, us-gaap:ReportableSubsegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value7875728386736778768267898599103133139144144148157165167203240237254249251253269266273271
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.810.69.211.713.210.08.910.710.312.09.713.212.815.115.320.320.624.823.023.925.127.527.231.727.428.127.527.828.730.230.429.526.728.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.810.69.211.713.210.08.910.710.312.09.713.212.815.115.320.320.624.823.023.925.127.527.231.727.428.127.527.828.730.230.429.526.728.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:HigherEducation us-gaap:ReportableSubsegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanInternational, us-gaap:ReportableSubsegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value181171165123164199197178188185184167184183190171171164184160182169184192200192225207213202232198187184
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.624.121.117.325.227.325.924.125.626.826.824.827.427.828.226.125.428.229.325.829.028.130.030.022.822.724.423.124.324.126.222.018.419.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.624.121.117.325.227.325.924.125.626.826.824.827.427.828.226.125.428.229.325.829.028.130.030.022.822.724.423.124.324.126.222.018.419.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:KaplanInternational us-gaap:ReportableSubsegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:Education, ghc:SupplementalEducation, us-gaap:ReportableSubsegments


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value77797981
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.711.212.211.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.711.212.211.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:SupplementalEducation us-gaap:ReportableSubsegments100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanCorporateAndOther


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3.6153.3633.2053.1943.0393.2052.3592.452.3692.3020.2720.1430.4420.2850.1740.0490.0570.0140.0240.0470.0180.125
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.50.40.40.50.40.30.30.30.30.00.00.10.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.50.40.40.50.40.30.30.30.30.00.00.10.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:KaplanCorporateAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:Education, us-gaap:IntersubsegmentEliminations


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-1.558-1.282-1.018-0.904-0.815-1.267-0.877-0.542-0.294-0.748-0.866-0.53-0.382-0.705-0.641-0.642-0.239-0.557-0.452-0.46-0.459-0.347-0.123-0.096-0.135-0.132-0.343-0.179-0.5-0.29-0.791-0.568-0.189-0.405
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.2-0.2-0.1-0.1-0.1-0.2-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.0-0.1-0.1-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.2-0.2-0.1-0.1-0.1-0.2-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.0-0.1-0.1-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education us-gaap:IntersubsegmentEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

us-gaap:Product


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value290228223224169215231216197175
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.232.128.431.325.929.430.329.326.825.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.232.128.431.325.929.430.329.326.825.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Product100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Service


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value511483563492483516532522539516
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax63.867.971.668.774.170.669.770.773.274.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax63.867.971.668.774.170.669.770.773.274.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Service100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value801712787716652732763738737692689674672659675657676582629621628601616641879846925898878840888902102195910501011100697210631032107210631185118711971142
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.525-0.349-0.312-0.474-0.224-0.044-0.04-0.0550.0-0.021-0.024-0.0510.00.00.00.00.0-0.069-0.07-0.057-0.0590.00.00.00.0-0.03-0.098-0.039-0.049-0.076-0.077
Percentage of Revenues-0.1-0.1-0.0-0.1-0.0-0.0-0.0-0.00.0-0.0-0.0-0.00.00.00.00.00.0-0.0-0.0-0.0-0.00.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.1-0.0-0.1-0.0-0.0-0.0-0.00.0-0.0-0.0-0.00.00.00.00.00.0-0.0-0.0-0.0-0.00.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination100.0100.0103.0132.0100.0100.0100.0100.00.0100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value302333356354357367372346358370375380376386372391386419401421481523500551543547526555546548527
Percentage of Revenues42.251.048.746.448.449.953.850.353.155.056.956.357.357.264.062.162.266.766.768.475.159.559.259.660.562.362.662.460.653.755.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax42.251.048.746.448.449.953.850.353.155.056.956.357.357.264.062.162.266.766.768.475.159.559.259.660.562.362.662.460.653.755.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:GrahamHealthcareGroup


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value5149454240403737353837384038
Percentage of Revenues7.27.56.35.65.55.55.55.55.35.75.75.76.25.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.27.56.35.65.55.55.55.55.35.75.75.76.25.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:GrahamHealthcareGroup100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:Manufacturing


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value10683113107111114115117126126117
Percentage of Revenues14.912.715.514.115.115.616.617.118.718.817.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.912.715.514.115.115.616.617.118.718.817.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Manufacturing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:TelevisionBroadcasting


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1331001151231151161081521301141081111011069110811296929589908310287888585738068
Percentage of Revenues18.715.415.816.215.615.815.622.219.317.016.516.415.415.715.717.318.115.315.315.414.010.39.911.19.710.010.29.68.17.97.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.715.415.816.215.615.815.622.219.317.016.516.415.415.715.717.318.115.315.315.414.010.39.911.19.710.010.29.68.17.97.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:TelevisionBroadcasting100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value123768911998212173171501501371841791831181291221131089970
Percentage of Revenues17.211.712.215.613.328.825.12.522.322.420.927.327.327.120.320.619.718.018.116.210.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.211.712.215.613.328.825.12.522.322.420.927.327.327.120.320.619.718.018.116.210.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:AllOtherSegments0.087.988.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:HigherEducation, us-gaap:ReportableSubsegments


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value8386736778768267898599103133139144144148157165167203240237254249251253269266273271
Percentage of Revenues11.713.210.08.910.710.312.09.713.212.815.115.320.320.624.823.023.925.127.527.231.727.428.127.527.828.730.230.429.526.728.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.713.210.08.910.710.312.09.713.212.815.115.320.320.624.823.023.925.127.527.231.727.428.127.527.828.730.230.429.526.728.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:HigherEducation us-gaap:ReportableSubsegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanInternational, us-gaap:ReportableSubsegments


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value123164199197178188185184167184183190171171164184160182169184192200192225207213202232198187184
Percentage of Revenues17.325.227.325.924.125.626.826.824.827.427.828.226.125.428.229.325.829.028.130.030.022.822.724.423.124.324.126.222.018.419.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.325.227.325.924.125.626.826.824.827.427.828.226.125.428.229.325.829.028.130.030.022.822.724.423.124.324.126.222.018.419.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:KaplanInternational us-gaap:ReportableSubsegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:Education, ghc:ProfessionalU.S., us-gaap:ReportableSubsegments


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value322838343335413534313327282733
Percentage of Revenues4.64.45.34.54.64.86.05.15.14.65.14.04.34.05.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.64.45.34.54.64.86.05.15.14.65.14.04.34.05.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:ProfessionalU.S. us-gaap:ReportableSubsegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, ghc:Education, ghc:TestPreparation, us-gaap:ReportableSubsegments


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value59514252646561606768596072756462787966688380697085816761778568
Percentage of Revenues8.37.85.96.98.88.98.88.810.010.29.08.911.111.211.19.912.612.611.011.113.09.18.27.69.59.28.16.98.68.47.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.37.85.96.98.88.98.88.810.010.29.08.911.111.211.19.912.612.611.011.113.09.18.27.69.59.28.16.98.68.47.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:TestPreparation us-gaap:ReportableSubsegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanCorporateAndOther


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3.1943.0393.2052.3592.452.3692.3020.2720.1430.4420.2850.1740.0490.0570.0140.0240.0470.0180.125
Percentage of Revenues0.40.50.40.30.30.30.30.00.00.10.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.50.40.30.30.30.30.00.00.10.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education ghc:KaplanCorporateAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ghc:Education, us-gaap:IntersubsegmentEliminations


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.904-0.815-1.267-0.877-0.542-0.294-0.748-0.866-0.53-0.382-0.705-0.641-0.642-0.239-0.557-0.452-0.46-0.459-0.347-0.123-0.096-0.135-0.132-0.343-0.179-0.5-0.29-0.791-0.568-0.189-0.405
Percentage of Revenues-0.1-0.1-0.2-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.0-0.1-0.1-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.1-0.2-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.0-0.1-0.1-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments ghc:Education us-gaap:IntersubsegmentEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value65766518644458115672564559315487521251974764487347304760493746194508441644324438432843124352452461815525575254885289592058115095492448765105496648774939501649865092500551585186
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value25922645266525522447242725982424217021931842189318481871201820551968193519791929185618461836193829692370257925542442249124942347222222372495230522742295239723632365228823252227
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets39.440.641.443.943.143.043.844.241.642.238.738.939.139.340.944.543.743.844.743.542.942.842.242.848.042.944.846.546.242.142.946.145.145.948.946.446.646.547.847.446.545.745.143.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value65766518644458115672564559315487521251974764487347304760493746194508441644324438432843124352452461815525575254885289592058115095492448765105496648774939501649865092500551585186
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value396838573759323932063206331930523032299329162490256231783121314028902831341233002731268426152586260126042708269728142939
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets60.359.258.355.756.556.856.055.658.257.661.257.256.651.456.554.652.753.557.656.853.654.553.650.751.952.253.253.954.656.7

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value16401837177415191408144916631534148514771532153514951521173516171597175918711715162716051860195621131486169012641135183017021510136512751453127811641173124511811205121713611388
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets24.928.227.526.124.825.728.028.028.528.432.231.531.632.035.235.035.439.942.238.737.637.242.743.234.226.929.423.021.530.929.329.627.726.228.525.723.923.824.823.723.724.326.426.8

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-042010-01-032008-12-282007-12-30
Value1143504132952601782001421711702532652883153903954326326485936005307549771219619772441325642569440386300512305264294381311299329437577659533442357287
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.75.46.45.14.63.23.42.63.33.35.35.46.16.67.98.69.614.314.613.413.912.317.321.619.711.213.48.06.110.99.88.77.96.210.06.25.46.07.66.25.96.68.50.00.00.08.50.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value125372423311279201214157187191264276302328407416455657670621632774
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.95.76.65.44.93.63.62.93.63.75.55.76.46.98.39.010.114.915.114.014.617.8

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value496495519458430485595582506503538544476499600591553538398379375382388356397430
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.67.68.17.97.68.610.010.69.79.711.311.210.110.512.213.412.79.46.87.47.57.77.67.17.78.3

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value7.6311.4270.9420.9760.9391110587889682777888666568686063645853539491817879807776849182777875707380786864
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.00.00.00.00.21.81.61.71.91.71.61.71.91.31.41.51.61.41.41.51.41.21.21.51.71.41.41.51.41.31.51.71.91.61.61.61.51.41.51.61.61.31.2

Land

us-gaap:Land

us-gaap:Land


Land
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-02
Value1917151610101832424141
Percentage of Land100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.30.30.20.20.30.60.80.80.8

Machinery And Equipment Gross

us-gaap:MachineryAndEquipmentGross

us-gaap:MachineryAndEquipmentGross


Machinery
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-02
Value39837038238743343823572289261724792401
Percentage of MachineryAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.26.28.07.99.810.141.039.451.349.446.5

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-02
Value84983478074477875028173011340632713192
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.214.116.415.117.617.349.051.866.765.261.9

Leasehold Improvements Gross

us-gaap:LeaseholdImprovementsGross

us-gaap:LeaseholdImprovementsGross


Leasehold
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-02
Value229233206215209205214294314304308
Percentage of LeaseholdImprovementsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.63.94.34.44.74.73.75.16.26.16.0

Construction In Progress Gross

us-gaap:ConstructionInProgressGross

us-gaap:ConstructionInProgressGross


Construction
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-02
Value2579681636137194669591
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.41.31.40.30.80.31.21.61.31.91.8

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-02
Value470450487484544519195720832325-2119.059-1991.791
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.37.610.29.812.311.934.035.945.5-42.2-38.6

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value13131414141413131213131211101210106.8367.5116.626.2786.2625.124.5124.6774.7695.257.4063.363.0813.7312.8373.3133.7177.6115.14.54.2786.8199.37.46.8086.556.57.6046.516
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AmortizationOfIntangibleAssets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3.9144.1654.3674.3354.2714.2014.0273.9443.3773.5673.8682.6821.6631.1491.3641.3551.3231.122.3581.7731.7041.681
Percentage of AmortizationOfIntangibleAssets28.229.930.930.629.829.729.329.126.227.328.921.914.611.110.612.412.616.431.426.827.126.8
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:OperatingSegments ghc:Education0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value373375378379376382384370327319293271265258259259263243233225222224231203819823860870847845927910103110451081110011171129115211491168117812001239
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.75.85.96.56.66.86.56.86.36.16.25.65.65.45.35.65.85.55.35.15.15.25.34.513.314.915.015.916.014.316.017.921.021.421.222.222.922.923.023.022.923.623.323.9

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures


Investments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value16416915515715616716216315914014314213313112812267605864636059535036192121201532272215252119172532293154
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.62.42.72.83.02.73.03.12.73.02.92.82.82.62.61.51.41.31.51.51.41.41.20.80.70.30.40.40.40.30.60.60.50.30.50.40.40.30.50.60.60.61.1

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value1653148514841458144013621388134513351339129713101280130112991299127911791122115011531180101794713251314134813531348124112881293128813091317140613981404141414151463139013761423
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets25.122.823.025.125.424.123.424.525.625.827.226.927.127.326.328.128.426.725.325.926.727.423.420.921.423.823.424.725.521.022.225.426.226.925.828.328.728.428.228.428.727.826.727.4

us-gaap:Goodwill us-gaap:BusinessAcquisition

us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitions


Goodwillus-gaap:
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value167737676846341419.6291431431384218476128
Percentage of Goodwill10.15.05.35.36.14.73.23.20.811.011.010.83.616.47.59.6
Percentage of Assets2.51.11.31.41.41.20.90.80.22.93.13.11.04.21.72.2
Percentage of Assets us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitions0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Goodwill us-gaap:StatementBusinessSegments

ghc:Education


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-31
Value85385285282380479080978879680679780980182282082080679576078779481865564293592895497410019849719941108
Percentage of Goodwill51.657.457.456.455.958.058.358.659.660.261.561.862.663.263.263.163.067.467.768.568.869.364.467.870.570.670.872.174.279.375.475.578.3
Percentage of Assets13.013.113.214.214.214.013.714.415.315.516.716.616.917.316.617.717.918.017.117.718.319.015.114.215.116.816.617.818.916.616.719.522.1
Percentage of Assets ghc:Education0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ghc:GrahamHealthcareGroup


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value98989898989898776969696969696959
Percentage of Goodwill6.06.66.66.76.87.27.15.85.25.25.45.35.45.35.35.3
Percentage of Assets1.51.51.51.71.71.71.71.41.31.31.51.41.51.51.41.3
Percentage of Assets ghc:GrahamHealthcareGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ghc:Manufacturing


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-31
Value227227227227227227227226223212
Percentage of Goodwill13.815.315.315.615.816.716.416.817.316.3
Percentage of Assets3.53.53.53.94.04.03.84.14.74.3
Percentage of Assets ghc:Manufacturing0.00.00.00.00.00.00.00.00.00.0

ghc:TelevisionBroadcasting


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-31
Value190190190190190190190190190190190190190190190192192190168168168168168168168168168165165142203203203
Percentage of Goodwill11.512.812.913.113.214.013.714.214.314.214.714.614.914.714.714.815.016.115.014.614.614.316.517.812.712.812.512.212.311.515.815.414.4
Percentage of Assets2.92.93.03.33.43.43.23.53.73.74.03.94.04.03.94.24.34.33.83.83.93.93.93.72.73.02.93.03.12.43.54.04.0
Percentage of Assets ghc:TelevisionBroadcasting0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllOtherSegments


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value283115115118103394545278272239239218134
Percentage of Goodwill17.17.87.88.17.22.93.33.420.920.418.518.316.812.0
Percentage of Assets4.31.81.82.01.80.70.80.85.35.25.04.94.43.0
Percentage of Assets us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Goodwill us-gaap:StatementBusinessSegments, us-gaap:Subsegments

ghc:Education, ghc:HigherEducation


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value6363636363636363636363636363141141141141141141143143143409
Percentage of Goodwill3.84.34.34.34.44.64.64.74.74.74.94.84.94.910.910.911.012.012.612.312.512.214.130.4
Percentage of Assets1.01.01.01.11.11.11.11.21.21.21.31.31.31.32.93.13.13.23.23.23.33.33.37.1
Percentage of Assets ghc:Education ghc:HigherEducation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ghc:Education, ghc:KaplanInternational


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value636635634605587573595574582592583596598627615614601590555582586610447481
Percentage of Goodwill38.542.842.841.540.842.142.942.743.644.245.045.546.748.247.447.347.050.049.450.650.851.744.035.7
Percentage of Assets9.79.79.910.410.410.210.010.511.211.412.212.212.613.212.513.313.313.412.513.113.514.210.38.4
Percentage of Assets ghc:Education ghc:KaplanInternational0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ghc:Education, ghc:KaplanProfessional


Goodwillus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value89898986868686868675660.066
Percentage of Goodwill6.16.26.66.26.46.56.46.66.65.95.10.05.9
Percentage of Assets1.51.61.61.51.61.71.71.81.81.61.40.01.5
Percentage of Assets ghc:Education ghc:KaplanProfessional0.00.00.00.00.00.00.00.00.00.00.00.00.0

ghc:Education, ghc:SupplementalEducation


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-312018-12-31
Value154154154150150
Percentage of Goodwill9.310.410.410.911.6
Percentage of Assets2.32.42.42.53.2
Percentage of Assets ghc:Education ghc:SupplementalEducation0.00.00.00.00.0

ghc:Education, ghc:TestPreparation


Goodwillus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value646464646464646464646463636363636363636363
Percentage of Goodwill4.44.54.74.74.84.84.85.04.95.05.04.94.95.05.45.75.55.55.46.34.7
Percentage of Assets1.11.11.11.11.21.21.21.41.31.41.41.31.41.41.41.41.41.51.51.51.1
Percentage of Assets ghc:Education ghc:TestPreparation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill


Indefinite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value1211211201171151161401441261289911410010310210911093666870732114510510516572535519541541539539539525530530530530536530530540
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.81.91.92.02.02.12.42.62.42.52.12.42.12.22.12.42.42.11.51.51.61.70.50.38.39.29.010.410.18.89.310.611.011.110.610.610.910.710.610.610.510.610.310.4

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

ghc:LicensureAndAccreditation


Indefinite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value0.150.150.150.150.150.150.150.150.150.150.150.150.150.150.650.650.650.650.8340.8340.8340.8340.8340.9940.9940.9946.7817.3217.3217.1717.1717.371
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill0.10.10.10.10.10.10.10.10.10.10.20.10.10.10.60.60.60.71.31.21.21.13.86.80.20.21.31.31.41.41.31.4
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.1
Percentage of Assets ghc:LicensureAndAccreditation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FranchiseRights


Indefinite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-01-02
Value212121212121282828280.00.00.0496496496496496496496496496496496496496496496496496496
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill18.018.118.118.518.918.820.419.422.021.80.00.00.097.197.196.086.792.795.691.791.792.092.092.094.493.693.593.593.592.493.5
Percentage of Assets0.30.30.30.40.40.40.50.50.50.50.00.00.08.09.08.69.09.48.48.59.710.110.29.710.010.210.09.910.09.79.6
Percentage of Assets us-gaap:FranchiseRights0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingAndBroadcastRights


Indefinite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value1111111111111118181818181818182626260.0
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill9.19.19.19.39.59.57.813.014.814.619.016.418.718.118.424.224.228.50.0
Percentage of Assets0.20.20.20.20.20.20.20.30.40.40.40.40.40.40.40.60.60.60.0
Percentage of Assets us-gaap:OperatingAndBroadcastRights0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TrademarksAndTradeNames


Indefinite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value8888878482831009780818095818482828265656769722113
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill72.872.772.672.071.571.671.767.563.063.580.983.581.181.881.075.275.270.898.798.898.898.996.22.6
Percentage of Assets1.31.41.41.51.51.51.71.81.51.61.72.01.71.81.71.81.81.51.51.51.61.70.50.2
Percentage of Assets us-gaap:TrademarksAndTradeNames0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value264190204218231235233245237250263260236230237239248153107114100106107818690967861363943384245465052545659616171
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.02.93.23.84.14.23.94.54.64.85.55.35.04.84.85.25.53.52.42.62.32.52.51.81.41.61.71.41.20.60.70.90.80.90.90.91.01.11.11.11.21.21.21.4

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ContractBasedIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value9.64310101011111212131313141415154041450.0
Percentage of FiniteLivedIntangibleAssetsNet3.65.35.15.04.95.05.25.25.55.45.35.56.36.66.616.916.629.40.0
Percentage of Assets0.10.20.20.20.20.20.20.20.30.30.30.30.30.30.30.90.91.00.0
Percentage of Assets us-gaap:ContractBasedIntangibleAssets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CustomerRelationships


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value13010711612313113914715515115916817516216917615015771737865696849515357624924262828303226282727
Percentage of FiniteLivedIntangibleAssetsNet49.256.756.756.756.659.463.063.363.963.963.967.468.973.474.363.063.446.568.368.465.164.863.960.359.859.458.980.379.867.066.566.174.373.372.256.155.452.651.0
Percentage of Assets2.01.71.82.12.32.52.52.82.93.13.53.63.43.63.63.33.51.61.71.81.51.61.61.10.81.01.01.10.90.40.50.60.60.60.60.50.60.60.6
Percentage of Assets us-gaap:CustomerRelationships0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Databases


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-01-02
Value13131416181717181617182016161415164.4861.2330.3130.3760.4390.5031.1511.3141.4941.6743.8264.3233.4593.7994.0820.00.3750.751.1251.541.9232.3553.7185.6537.593
Percentage of FiniteLivedIntangibleAssetsNet5.16.97.37.67.87.67.67.46.86.97.17.87.17.06.16.46.52.91.10.30.40.40.51.41.51.61.74.97.09.59.69.40.00.91.62.43.03.64.36.69.612.4
Percentage of Assets0.20.20.20.30.30.30.30.30.30.30.40.40.40.30.30.30.40.10.00.00.00.00.00.00.00.00.00.10.10.10.10.10.00.00.00.00.00.00.00.10.10.1
Percentage of Assets us-gaap:Databases0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncompeteAgreements


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-01-02
Value0.0110.0370.0630.0890.3070.3460.3840.4220.4610.2250.250.3150.4060.5250.4630.5310.70.2660.3260.4580.2070.2880.3690.4490.530.610.911.0191.0470.8280.9181.0161.061.1791.4622.1332.6643.1973.7293.8345.04810
Percentage of FiniteLivedIntangibleAssetsNet0.00.00.00.00.10.10.20.20.20.10.10.10.20.20.20.20.30.20.30.40.20.30.30.50.60.70.91.31.72.32.32.32.82.83.24.65.26.16.86.88.616.9
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.2
Percentage of Assets us-gaap:NoncompeteAgreements0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value117.2338.0868.949.794101112131314155.2155.4885.7626.3367.586.7087.0577.7276.3437.1147.8860.4721.1241.3041.4891.6831.8862.072.2642.6911.3311.6852.012.8072.7283.083.406
Percentage of FiniteLivedIntangibleAssetsNet4.33.84.04.14.24.55.05.15.55.55.66.02.22.42.42.63.14.46.56.76.36.77.40.61.31.41.52.23.15.75.76.23.54.04.46.05.45.86.2
Percentage of Assets0.20.10.10.20.20.20.20.20.20.30.30.30.10.10.10.10.20.20.20.20.10.20.20.00.00.00.00.00.00.00.00.10.00.00.00.10.10.10.1
Percentage of Assets us-gaap:OtherIntangibleAssets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TrademarksAndTradeNames


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value9951555760544446434547343623242525252527282929303133356.275
Percentage of FiniteLivedIntangibleAssetsNet37.727.326.926.626.323.319.018.918.218.118.013.115.410.410.410.810.116.623.724.228.127.927.937.236.836.836.915.9
Percentage of Assets1.50.80.91.01.11.00.70.80.80.91.00.70.80.50.50.60.60.60.60.60.70.70.70.70.50.60.60.1
Percentage of Assets us-gaap:TrademarksAndTradeNames0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4444534624864814865265033613820.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets6.87.07.28.48.58.68.99.26.97.40.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value1571481461471401281281291421291171171131231029275737381856775787265655347615049535246545659646372575659
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.42.32.32.52.52.32.22.42.72.52.52.42.42.62.12.01.71.71.61.82.01.61.71.71.21.21.11.00.91.00.91.01.11.10.91.11.21.21.31.31.41.21.11.1

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi

us-gaap:EquitySecuritiesFvNi


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value751700573491431436585535518510496497452
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.410.78.98.57.67.79.99.89.99.810.410.29.6

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value751700573491431436585535518510496497452
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.410.78.98.57.67.79.99.89.99.810.410.29.6
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value751700573491431436585535518510496497452
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.410.78.98.57.67.79.99.89.99.810.410.29.6
Percentage of Assets us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ghc:MarkelCorporation


Equity
Period End2021-06-302021-03-312020-12-312019-12-312018-12-31
Value5250283229
Percentage of EquitySecuritiesFvNi7.07.25.05.55.9
Percentage of Assets0.80.80.40.50.6
Percentage of Assets ghc:MarkelCorporation0.00.00.00.00.0

Accounts Payable And Accrued Liabilities Current

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value512492520500433433507477461422486448457435526446451444500406451399428410502414464462429393505478447444486493492492495575642580626555
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.87.68.18.67.67.78.68.78.88.110.29.29.79.110.79.710.010.111.39.210.49.39.89.18.17.58.18.48.16.78.79.49.19.19.59.910.110.09.911.512.611.612.110.7

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent dei:LegalEntity

ghc:CableOne


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value151520212020
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent3.13.24.04.44.84.8
Percentage of Assets0.20.20.30.40.40.4
Percentage of Assets ghc:CableOne0.00.00.00.00.00.0

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302020-12-31
Value116106
Percentage of AccountsPayableCurrent100.0100.0
Percentage of Assets1.81.6

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312011-10-022011-01-02
Value8.2366.8915.144.4013.0290.6154.1216.6681412107.235108.5936.1090.00.00.08.23111285052550.022152.9920.7260.00.00.0
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.00.00.0
Percentage of Assets0.10.10.10.10.10.00.10.10.30.20.20.10.20.20.10.00.00.00.10.22.20.91.00.90.00.40.30.10.00.00.00.0

Debt Current

us-gaap:DebtCurrent

us-gaap:DebtCurrent


Debt
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-01-02
Value6.45282819.3519.5686.366.5686.5534066.7266.7136.4926.1586.1286.4980.03.07.5375.171465053493.1683.0223.1293.1692433.0433.1733.251123.1073.2193.0
Percentage of DebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.11.41.50.20.20.10.10.18.50.10.10.10.10.10.10.00.10.10.10.80.91.00.80.10.10.10.14.80.10.10.12.30.10.10.1

Dividends Payable Current

us-gaap:DividendsPayableCurrent

us-gaap:DividendsPayableCurrent


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-01-02
Value7.5537.5537.2597.5727.5860.07.3877.3887.3880.07.0717.1347.3190.07.0257.0817.10.06.7976.7976.820.06.71515150.01414190.00.2060.2130.2220.01818180.0180.0
Percentage of DividendsPayableCurrent100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.00.0
Percentage of Assets0.10.10.10.10.10.00.10.10.10.00.10.20.20.00.20.20.20.00.20.20.20.00.10.30.30.00.30.30.30.00.00.00.00.00.40.40.40.00.40.0

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value9029279499158189371041988814829812804746115287881375577881875474473572576490384810501014915981934993863870112690587491299599810449951008989
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.714.214.715.814.416.617.618.015.616.017.016.515.824.217.817.616.817.618.517.017.217.116.716.914.615.418.318.517.316.616.119.517.517.822.118.217.918.519.820.020.519.919.519.1

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value4.2484.2386.4526.1045.8587882
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.11.41.4

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value868486888789927880820.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets1.31.31.31.51.51.61.61.41.51.60.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302020-12-31
Value256278
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0
Percentage of Assets3.94.3

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value50650650650950543043042049750047047347891486486489487485490400399399399947399399398398403447448446453453453452453452450402396396396
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.77.87.98.88.97.67.37.79.59.69.99.710.11.99.910.510.911.011.011.19.29.39.28.815.37.26.97.37.56.87.78.89.19.38.99.19.39.29.09.07.97.97.77.6

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312018-01-012017-12-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value531549521407405406427309364347361377403416403
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.18.48.17.07.27.27.26.50.07.08.28.59.39.69.3

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value4.795.6637.1242021
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.40.5
Percentage of Assets us-gaap:OtherPostretirementBenefitPlansDefinedBenefit0.00.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value11510996104100
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent2417.61937.91350.7499.6461.8
Percentage of Assets1.81.92.02.12.3
Percentage of Assets us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit0.00.00.00.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312011-10-022011-01-02
Value7826000.07214000.07091000.06845000.06748000.06785000.07557000.06901000.06042000.05938000.000000476000.09937000.0326000.0269000.0221000.0293000.0338000.0278000.0190000.0000
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.00.20.00.00.00.00.00.00.00.00.00.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value3236486275312727222257596063656764676567717070737482918886848686102107109115112112107111114112119134
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.60.81.11.30.60.50.50.40.41.21.21.31.31.31.51.41.51.51.51.71.61.61.61.21.51.61.61.61.41.51.72.12.22.22.32.32.32.12.22.32.22.32.6

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4074194284544514404774623233370.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets6.26.46.77.88.07.88.08.46.26.50.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value88
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets1.4

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value71
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets1.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value57
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.9

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value45
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.7

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value280
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets4.4

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value515569540404420
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets8.09.69.97.88.1

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value650
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets10.1

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value135
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets2.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value396838573759323932063206331930523032299329162490256231783121314028902831341233002731268426152586260126042708269728142939
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets60.359.258.355.756.556.856.055.658.257.661.257.256.651.456.554.652.753.557.656.853.654.553.650.751.952.253.253.954.656.7

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value39753864376632463213321233263058303829992916297528772884291525602536248024522508247224402490256231783121314028992832341233002732268526152586264225842626260126042708269728142940
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets60.559.358.455.956.756.956.155.758.357.761.261.060.860.659.055.456.356.255.356.557.156.657.256.651.456.554.652.853.557.656.853.654.553.650.753.253.053.251.952.253.253.954.656.7

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementClassOfStock

us-gaap:CommonClassA


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-032008-12-28
Value0.9640.9640.9640.9640.9640.9751.1691.2191.2291.2411.2921.292
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassB


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-032008-12-28
Value191919191919181818181818
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.50.60.70.70.80.60.60.70.70.70.60.0
Percentage of Assets0.30.30.40.40.40.30.30.40.40.40.40.0
Percentage of Assets us-gaap:CommonClassB0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-032008-12-282007-12-30
Value5935945953283273263252292302312323283313333341681681691702612612613925011176373-0.99-79.914298
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest14.915.415.810.110.210.29.87.57.67.78.011.111.511.611.56.66.76.87.010.410.610.512.515.24.52.42.6-0.00.00.0
Percentage of Assets9.09.19.25.65.85.85.54.24.44.54.96.77.07.06.83.63.73.83.95.96.06.06.88.62.31.31.4-0.00.00.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value-1.24-1.25-1.727-1.944-2.065-1.955-0.738-0.41-0.061-0.0960.2630.3030.308-0.184-0.277
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.0-0.0-0.0-0.1-0.1-0.1-0.0-0.0-0.0-0.00.00.00.0-0.0-0.0
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.0-0.0-0.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value603602603303282265303181200212203313318351535236314453699
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest15.215.616.09.48.88.39.15.96.67.17.010.511.112.218.49.612.614.421.2
Percentage of Assets9.29.29.45.25.04.75.13.33.84.14.36.46.77.410.85.37.27.912.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-032008-12-282007-12-30
Value109.2689.754-22.429-42.859-59.264-21.888-47.025-30.341-19.237-29.27-16.133-13.289176.3147.778-3.692-13.33-26.998-6.478-6.125-4.8498.5482526213727-3.41242
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.30.20.3-0.7-1.3-1.8-0.7-1.5-1.0-0.6-1.0-0.5-0.50.60.20.3-0.1-0.5-1.1-0.3-0.2-0.20.30.81.00.81.30.90.00.0
Percentage of Assets0.20.10.2-0.4-0.8-1.0-0.4-0.9-0.6-0.4-0.6-0.3-0.30.40.10.2-0.1-0.3-0.6-0.1-0.1-0.10.10.40.50.40.70.50.00.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-032008-12-282007-12-30
Value386385388386384383381379378376378376374372370364356303288240252249241232217
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest9.710.010.311.912.011.911.512.412.412.613.012.713.012.912.714.914.39.78.79.39.78.98.20.00.0
Percentage of Assets5.95.96.06.76.86.86.46.97.37.28.07.77.97.87.58.28.25.35.04.75.04.84.70.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value603602603303282265303181200212203313318351535311271254236314307314453
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest15.215.616.09.48.88.39.15.96.67.17.010.511.112.218.412.210.710.39.612.512.412.614.4
Percentage of Assets9.29.29.45.25.04.75.13.33.84.14.36.46.77.410.86.76.05.85.37.17.17.27.9
Percentage of Assets us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-032008-12-282007-12-30
Value7.8267.2147.0916.8456.7486.7857.5576.9016.0425.9380.00.00.00.00.00.00.00.4760.2210.190.00.00.4710.8850.811
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.20.20.20.20.20.20.20.20.20.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-032008-12-282007-12-30
Value7009690268046567649764856534638863526303623661796061602157915588544760084782454645614520432443134329
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest176.3178.6180.7202.3202.2201.9196.4208.9209.1210.1213.8207.7210.7208.7198.7227.8218.7191.3144.9175.8175.3160.6147.10.00.0
Percentage of Assets106.6105.9105.6113.0114.5114.9110.2116.4121.9121.3130.9126.8128.1126.5117.3126.1125.1104.582.389.190.987.683.40.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-032008-12-282007-12-30
Value-4051.958-4051.909-4056.993-4038.052-3977.722-3948.427-3920.152-3918.397-3918.254-3918.254-3922.009-3914.058-3897.301-3881.716-3802.834-3756.85-3648.546-3645.476-2490.333-2474.347-2398.189-2157.826-1750.686-1697.268-1600.883
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-101.9-104.8-107.7-124.4-123.8-122.9-117.8-128.1-128.9-130.6-134.5-131.5-135.4-134.6-130.5-153.2-146.5-116.1-75.5-95.7-92.2-76.7-59.50.00.0
Percentage of Assets-61.6-62.2-63.0-69.5-70.1-69.9-66.1-71.4-75.2-75.4-82.3-80.3-82.4-81.5-77.0-84.8-83.8-63.4-42.9-48.5-47.8-41.8-33.80.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-03
Value0.9640.9640.9640.9640.9640.9640.9751.1691.2191.2291.2411.292
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassB


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-03
Value191919191919191818181818
Percentage of CommonStockValue1974.71974.71974.71974.71974.71974.71951.31610.91540.71527.31511.61448.0
Percentage of Assets0.30.30.40.40.40.40.30.30.40.40.40.4
Percentage of Assets us-gaap:CommonClassB0.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value386385388386384383381379378376378376374372370368365363364360357360356345311302303296291289288261252244240248245250252249247244249241
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.95.96.06.76.86.86.46.97.37.28.07.77.97.87.58.08.18.28.28.18.38.48.27.65.05.55.35.45.54.95.05.15.15.04.75.05.05.15.05.04.94.94.84.7

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value70096902680465676497648565346388635263036236617960616022579156485630559555885552552554715447539660405998600856745612487747824626459645514546466545894555456145004524449745204324
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets106.6105.9105.6113.0114.5114.9110.2116.4121.9121.3130.9126.8128.1126.5117.3122.3124.9126.7126.1125.1127.7126.9125.1119.397.7108.6104.5103.4106.182.482.390.893.393.389.193.994.192.290.990.388.889.987.683.4

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-01-03
Value40514051405640383977394839203918391839183922391438973881380237873752375337563738373737293648362936283635364536483648248724902476247724772474248124582393239823292281227121571750
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets61.662.263.069.570.169.966.171.475.275.482.380.382.481.577.082.083.285.084.884.286.386.583.880.258.765.863.466.569.042.042.948.650.350.848.550.050.448.447.846.744.845.441.833.8

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312011-10-022011-01-02
Value7826000.07214000.07091000.06845000.06748000.06785000.07557000.06901000.06042000.05938000.000000476000.09937000.0326000.0269000.0221000.0293000.0338000.0278000.0190000.0000
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.00.20.00.00.00.00.00.00.00.00.00.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1.6721.5891.7681.5671.5681.6691.6161.6391.9372.1622.325
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1.6721.5891.7681.5671.5681.6691.6161.6391.9372.1622.325
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.0

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders


Minority
Period End2021-06-302021-03-312020-09-30
Value152000.0126000.0276000.0
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0
Percentage of Assets0.00.00.0

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-312020-09-30
Value152000.0126000.0276000.0
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value4823-30.22711910812928821-37.922951215118478939911178.7218846-41.30338123-45.8713514811177-19.7621501237418112585841298313049150226138178
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.13.4-3.816.716.71.712.212.02.9-5.513.818.07.72.97.013.65.915.818.61.414.17.8-6.76.114.0-5.43.816.512.79.2-2.216.612.17.717.312.48.58.612.28.112.24.612.719.011.615.7

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-247.218-63.29186-13.929179.561-34.285-101.549-27.023-73.878-79.702-107.133-32.599-11.53-31.549-75.345-235.129-99.996-26.51-101.18513-196.852-150.643-160.872-61.224-52.831313-10.892-87.27613144-75.203-52.087-42.167-96.94-53.751-16.202-61.15-57.866-33.904-124.146-44.812-79.502-75.51-27.452-27.408
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-30.9-8.923.7-1.92.61.3-4.5-13.7-3.7-10.7-11.6-15.9-4.8-1.7-4.7-11.5-34.8-17.2-4.2-16.32.1-32.7-24.4-25.1-7.0-6.233.9-1.2-9.91.716.2-8.3-5.1-4.4-9.2-5.3-1.6-6.3-5.4-3.3-11.6-4.2-6.7-6.4-2.3-2.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-49.046-10.129-50.328-75.655-51.334-26.685-6.901-14.6823.28337-25.148-40.329-35.909-90.973-25.547-55.42-9.55-9.589-25.78786-29.045-74.857-31.611-112.248536-50.382-12.48-14.293-342.811-19.0324.115-22.89216-241.228122-33.41-98.243-112.237-1.467-32.01-37.946-115.538-176.48-238.806-19.775-56.111
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.1-1.4-6.4-10.6-7.9-3.6-0.9-2.00.45.4-3.6-6.0-5.3-13.8-3.8-8.4-1.4-1.6-4.113.9-4.6-12.4-5.1-17.561.0-6.0-1.3-1.6-39.0-2.30.5-2.51.6-25.211.6-3.3-9.8-11.5-0.1-3.1-3.5-10.9-14.9-20.1-1.7-4.9

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-247.087-50.4351113277-12.40556-30.227-3.491-72.99-12.62-26.006-25.444-79.381-8.846-38.734-202.196-13.47449-11.024
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-30.8-7.114.24.511.9-1.77.4-4.1-0.5-10.5-1.8-3.9-3.8-12.0-1.3-5.9-29.9-2.37.9-1.8

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value2329150.61620-21.5543127.5895.8923.744-6.7273.296-7.436-162.7581.93617128.499-3.70158-0.573-12.246-8.572
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-13.345-25.1967725-63.582-100.7326.294743.375-30.556-4.647238.304-87.31195150.483-122.6055343-8.037-41.749664732-59.7418345-8.931-23.4984962-6.588-23.022.862443.98-36.716104.5411-54.448-5.09318-1.569-26.401
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312014-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-6.52211-3.7352.789-11.3528.512-6.652-9.909138.807-3.562-3.1968.685.4290.4350.2871.9080.612-3.6583.561-1.7922.118-2.016-0.681-0.893.762-0.604-0.654-3.4590.431-4.889
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-11.53820294.427-1.40247252228453.216-10.223-7.20641152.37-2.0649.489-4.2271.0336.2729.187-9.089-7.19510178.48737-33.301-21.5362816-17.80824-3.835-3.168-17.10914-13.81622-6.0143445-22.031-4.106-0.12
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value4823-30.22711910812928821-37.922951215118478939911178.7218846-41.30338123-45.8713514811177-19.7621501237418112585841298313049150226138178
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.13.4-3.816.716.71.712.212.02.9-5.513.818.07.72.97.013.65.915.818.61.414.17.8-6.76.114.0-5.43.816.512.79.2-2.216.612.17.717.312.48.58.612.28.112.24.612.719.011.615.7

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value1151122377718-33.2451454357815612546422142441213633603751-230.84357213347675013215630445.162-45.43994523161-5.982451578619245
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.415.830.110.82.9-4.519.15.87.711.88.218.56.96.531.73.86.23.65.95.39.76.38.3-36.06.62.536.18.585.415.817.63.44.40.5-4.39.35.23.25.8-0.64.31.56.75.17.74.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value1151122367818-33.8911464257815612546422142441213633613851-230.55658213347674913215630455.259-45.37593523161-5.966451578619245
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.515.830.110.92.9-4.619.15.87.811.88.218.56.96.531.73.86.23.65.95.39.76.48.3-35.96.62.636.28.585.315.717.63.44.40.5-4.39.35.23.25.8-0.64.31.56.75.17.74.0

us-gaap:ProfitLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-0.0561.04-0.872-0.878-0.897-0.686651.0661.071.438252.4012.3910.9410.7080.8290.8360.9975.664-0.235
Percentage of ProfitLoss-0.00.9-0.4-1.1-4.82.045.22.51.91.844.91.95.12.20.33.32.04.715.3-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.1-0.1-0.1-0.1-0.18.60.10.10.23.70.40.40.10.10.10.10.20.9-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-0.153-0.154-0.161-0.166-0.124-0.036-0.0160.0130.0440.0540.050.0480.036-0.002-0.024-0.04-0.033
Percentage of ProfitLoss-0.1-0.1-0.1-0.2-0.70.1-0.00.00.10.10.10.00.1-0.0-0.0-0.2-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.00.00.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1151127818-33.8914257811254642
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.515.810.92.9-4.65.87.811.818.56.96.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312012-12-31
Value1.5751.4851.591.6231.5671.5681.5261.5251.6161.6111.241.911.1512.1112.6412.3242.3382.8663.0993.1673.8983.2549.61248.8265.0174.4547.023-9.2664.092
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-247.218-63.29186-13.929179.561-34.285-101.549-27.023-73.878-79.702-107.133-32.599-11.53-31.549-75.345-235.129-99.996-26.51-101.18513-196.852-150.643-160.872-61.224-52.831313-10.892-87.27613144-75.203-52.087-42.167-96.94-53.751-16.202-61.15-57.866-33.904-124.146-44.812-79.502-75.51-27.452-27.408
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-30.9-8.923.7-1.92.61.3-4.5-13.7-3.7-10.7-11.6-15.9-4.8-1.7-4.7-11.5-34.8-17.2-4.2-16.32.1-32.7-24.4-25.1-7.0-6.233.9-1.2-9.91.716.2-8.3-5.1-4.4-9.2-5.3-1.6-6.3-5.4-3.3-11.6-4.2-6.7-6.4-2.3-2.4

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value14131315142517232428391823171613141525191110161952477469563680555136655452447052533984744935
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-49.046-10.129-50.328-75.655-51.334-26.685-6.901-14.6823.28337-25.148-40.329-35.909-90.973-25.547-55.42-9.55-9.589-25.78786-29.045-74.857-31.611-112.248536-50.382-12.48-14.293-342.811-19.0324.115-22.89216-241.228122-33.41-98.243-112.237-1.467-32.01-37.946-115.538-176.48-238.806-19.775-56.111
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.1-1.4-6.4-10.6-7.9-3.6-0.9-2.00.45.4-3.6-6.0-5.3-13.8-3.8-8.4-1.4-1.6-4.113.9-4.6-12.4-5.1-17.561.0-6.0-1.3-1.6-39.0-2.30.5-2.51.6-25.211.6-3.3-9.8-11.5-0.1-3.1-3.5-10.9-14.9-20.1-1.7-4.9

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302015-09-302014-09-30
Value1.0371.0340.635740.8476.8952.4720.01
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value386029332.1030.00.00.07.18216157915340.00.395181.2667.71681220.00.00.00.00.03270.00.00.00.04.1965.65123740.1366847101211272331527
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateStatedPercentage

ghc:FivePointSevenFivePercentUnsecuredNotesdueJune12026


Debt
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-05-30
Value5.750.05750.05750.05750.05750.05750.05750.0575
Percentage of DebtInstrumentInterestRateStatedPercentage100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations ghc:FivePointSevenFivePercentUnsecuredNotesdueJune120260.00.00.00.00.00.00.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.126.90.690.573
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-01-032008-12-28
Value604.65569.31566.55565.65559.62552.0682.68469.76478.32494.95495.05525.44581.17
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

ghc:PriceRangeFour


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value865.02865.02865.02865.02719.15719.15659.65651.91
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice143.1151.9152.7152.9128.5130.396.6138.8

ghc:PriceRangeOne


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value243.85243.85259.19262.22261.18255.69383.37380.96
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice40.342.845.746.446.746.356.281.1

ghc:PriceRangeThree


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value719.15719.15719.15719.15421.91421.91502.58502.58
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice118.9126.3126.9127.175.476.473.6107.0

ghc:PriceRangeTwo


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value426.86325.26325.26325.26325.26325.26423.05421.75
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice70.657.157.457.558.158.962.089.8

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-02
Value512415348333327322355362356362361403754837767758714
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-02
Value202190112129196173193204241226223
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1.8981.5722.4831717177.00.00.00.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.00.00.00.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-02
Value474633484169737278-59.179-41.359
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:IncomeTaxAuthority

us-gaap:ForeignCountry


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value14119.98.29.54134372914
Percentage of DeferredTaxAssetsValuationAllowance31.624.729.916.823.060.047.451.138.3-23.7

us-gaap:StateAndLocalJurisdiction


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value313422383127383548
Percentage of DeferredTaxAssetsValuationAllowance65.973.567.078.077.040.152.748.961.7

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward

us-gaap:ForeignCountry, us-gaap:CapitalLossCarryforward


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value3.93.63.62.31.910
Percentage of DeferredTaxAssetsValuationAllowance8.37.810.94.74.614.5

ghc:AcceleratedDepreciation dei:LegalEntity

ghc:AcceleratedDepreciation

ghc:ClydesRestaurantGroup


Accelerated
Period End2020-12-312020-09-302020-06-30
Value02800000.02800000.0
Percentage of AcceleratedDepreciation0.0100.0100.0

ghc:AdditionalUndistributedEarningsDueToDilutiveStockOptions

ghc:AdditionalUndistributedEarningsDueToDilutiveStockOptions


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2000.01000.03000.01000.0006000.02000.02000.03000.02000.05000.02000.01000.013000.01000.03000.002000.02000.04000.02000.0004000.0031000.06000.031000.05000.01000.03000.01000.00
Percentage of AdditionalUndistributedEarningsDueToDilutiveStockOptions100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0

ghc:AmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets

ghc:AmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-03-312013-12-312013-09-302013-06-302013-03-31
Value1714141625302113132011101211196.8369.1146.626.2789.353253114.738223.0816.9812.8373.3133.717
Percentage of AmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:AmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-03-312013-12-312013-09-302013-06-302013-03-31
Value6.0735.2124.7096.251144.2014.0273.9443.8682.6821.6631.1491.3641.3551.3231.122.3581.7731.7042.5732498.3431.507192.2886.0442.2872.3632.518
Percentage of AmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets34.434.832.538.955.313.718.528.328.913.214.611.110.512.16.716.425.926.827.127.598.772.431.885.074.386.680.671.367.7

us-gaap:OperatingSegments, ghc:GrahamHealthcareGroup


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value0.780.7810.780.8231.3071.311.6891.9141.3999.8391.8092.1872.421.644
Percentage of AmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets4.45.25.45.15.14.37.713.710.548.315.916.921.58.3

us-gaap:OperatingSegments, ghc:Manufacturing


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value6.616.9876.9876.9876.9887.1376.7626.522
Percentage of AmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets37.446.648.343.527.023.331.046.8

us-gaap:OperatingSegments, ghc:TelevisionBroadcasting


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-03-312013-12-312013-09-302013-06-302013-03-31
Value1.3611.3591.3591.361.3611.369.1841.4081.4081.4081.4081.4083.4061.0710.970.9020.0620.0630.0630.0630.0630.0630.0630.0320.00.00.00.00.0
Percentage of AmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets7.79.19.48.55.34.442.110.110.56.912.413.626.39.54.913.20.71.01.00.70.00.51.30.10.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-30
Value2.8330.6450.6450.6451.89116-0.470.1566.6876.4496.5198.2058.809176.6944.7844.5116.7173.11
Percentage of AmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets16.04.34.54.07.354.2-2.21.150.031.657.263.278.488.473.472.371.971.81.2

ghc:AmountOfRevenueRecognizedFromProviderReliefFund ghc:CARESActFund, us-gaap:StatementBusinessSegments, us-gaap:UnusualOrInfrequentItem

ghc:AmountOfRevenueRecognizedFromProviderReliefFund

ghc:ProviderReliefFund, ghc:GrahamHealthcareGroup, ghc:CARESActReliefFromCOVID19


Amount
Period End2020-12-312020-09-302020-06-30
Value0200000.05500000.0
Percentage of AmountOfRevenueRecognizedFromProviderReliefFund0.0100.0100.0

ghc:AntidilutiveRestrictedStock

ghc:AntidilutiveRestrictedStock


Antidilutive
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value9000.01000.012000.010000.012000.0014000.012000.010000.0021000.021000.028000.01000.030000.029000.028000.0042000.041000.038000.0-1000.050000.055000.054000.01000.061000.055000.051000.04000.091000.050000.038000.0
Percentage of AntidilutiveRestrictedStock100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:AverageOutstandingDebtAmount

ghc:AverageOutstandingDebtAmount


Average
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value525512-0.39999999999994045155105110.9501507494-12.0480591496-0.349249549314473400399-7.9404454435-0.5450452451-6.1449454516
Percentage of AverageOutstandingDebtAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:ChangeinCapitalizedContractCostOther

ghc:ChangeinCapitalizedContractCostOther


Changein
Period End2021-06-302021-03-312020-12-31
Value199000.0-95000.01169000.0
Percentage of ChangeinCapitalizedContractCostOther100.0100.0100.0

ghc:ContractCostsCapitalizedDuringthePeriod

ghc:ContractCostsCapitalizedDuringthePeriod


Contract
Period End2021-06-302021-03-312020-12-31
Value4.8591127
Percentage of ContractCostsCapitalizedDuringthePeriod100.0100.0100.0

ghc:DeferredRevenuePeriodIncreaseDecreasePercentage

ghc:DeferredRevenuePeriodIncreaseDecreasePercentage


Deferred
Period End2021-06-302021-03-312020-12-31
Value-14.0-2.03.0
Percentage of DeferredRevenuePeriodIncreaseDecreasePercentage100.0100.0100.0

ghc:DepreciationDepletionAmortizationAndImpairment

ghc:DepreciationDepletionAmortizationAndImpairment


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-30
Value3431303448473829272628342827242224267
Percentage of DepreciationDepletionAmortizationAndImpairment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:DividendsPaidCommonStockAndSharebasedCompensationCash

ghc:DividendsPaidCommonStockAndSharebasedCompensationCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value7.553150.07.17.58115-0.0017.3867.38814-0.0187.0486.948140.07.0477.0814-0.0046.7966.775130.06.7361530134-14.773-14.819-37.6750.00.00.00.0
Percentage of DividendsPaidCommonStockAndSharebasedCompensationCash100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

ghc:Equityeffectofredemptionofredeemablenoncontrollinginterest us-gaap:Ownership, us-gaap:StatementBusinessSegments

ghc:Equityeffectofredemptionofredeemablenoncontrollinginterest

ghc:HooverTreatedWoodProducts, ghc:Manufacturing


Equityeffectofredemptionofredeemablenoncontrollinginterestus-gaap:
Period End2021-03-31
Value3500000.0
Percentage of Equityeffectofredemptionofredeemablenoncontrollinginterest100.0

ghc:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityForeignCurrencyTranslationGainLoss us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass

ghc:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityForeignCurrencyTranslationGainLoss

us-gaap:FairValueInputsLevel3, ghc:ContingentConsiderationLiabilities


Fair
Period End2021-06-302021-03-31
Value143000.0-109000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityForeignCurrencyTranslationGainLoss100.0100.0

ghc:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityGainLossAccretionIncludedInEarnings us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass

ghc:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityGainLossAccretionIncludedInEarnings

us-gaap:FairValueInputsLevel3, ghc:ContingentConsiderationLiabilities


Fair
Period End2021-06-302021-03-31
Value435000.0606000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityGainLossAccretionIncludedInEarnings100.0100.0

ghc:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityGainLossChangesInFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass

ghc:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityGainLossChangesInFairValue

us-gaap:FairValueInputsLevel3, ghc:MandatorilyRedeemableNoncontrollingInterest


Fair
Period End2021-06-302021-03-31
Value-955000.01051000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityGainLossChangesInFairValue100.0100.0

ghc:GainRelatedtoContingentConsideration

ghc:GainRelatedtoContingentConsideration


Gain
Period End2020-09-302020-06-302018-06-30
Value800000.01700000.01400000.0
Percentage of GainRelatedtoContingentConsideration100.0100.0100.0

ghc:GainRelatedtoContingentConsideration ghc:Transaction, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

ghc:KaplanUniversityTransaction, ghc:Education, ghc:HigherEducation


Gain
Period End2021-06-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value600000.01700000.0500000.0500000.0200000.00500000.01400000.0
Percentage of GainRelatedtoContingentConsideration0.0100.00.00.00.00.00.0100.0

ghc:IncomeLossAttributabletoRedeemableNoncontrollingInterestandNonredeemableNoncontrollingInterest

ghc:IncomeLossAttributabletoRedeemableNoncontrollingInterestandNonredeemableNoncontrollingInterest


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-198000.0439000.08000.0-646000.0136000.0-180000.0114000.0-46000.053000.06000.069000.074000.0382000.060000.03000.0000433000.0435000.0-60000.0287000.0434000.0774000.0
Percentage of IncomeLossAttributabletoRedeemableNoncontrollingInterestandNonredeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0

ghc:IncreaseDecreaseInLeaseLiabilitites

ghc:IncreaseDecreaseInLeaseLiabilitites


Increase
Period End2021-03-312020-03-31
Value-21119000.0-22503000.0
Percentage of IncreaseDecreaseInLeaseLiabilitites100.0100.0

ghc:NetPeriodicBenefitForDefinedBenefitPensionPlansExcludingEarlyRetirementProgramSpecialSeparationBenefitExpenseCurtailmentAndSettlement us-gaap:RetirementPlanType

ghc:NetPeriodicBenefitForDefinedBenefitPensionPlansExcludingEarlyRetirementProgramSpecialSeparationBenefitExpenseCurtailmentAndSettlement

us-gaap:PensionPlansDefinedBenefit


Net
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-22.03-13.888-14.043-13.639-13.172-13.123-12.717-13.653-18.573-18.59-19.573-17.295-14.758-14.764-14.829-14.688-12.39-12.389
Percentage of NetPeriodicBenefitForDefinedBenefitPensionPlansExcludingEarlyRetirementProgramSpecialSeparationBenefitExpenseCurtailmentAndSettlement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:NetProceedsFromSaleOfBusinessesPropertyPlantAndEquipmentAndOtherAssets

ghc:NetProceedsFromSaleOfBusinessesPropertyPlantAndEquipmentAndOtherAssets


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value4.4650.272240.7080.6440.2180.710.37118343.139-0.1514.558-17.890.5930.9120.0121.748320.006152142-3.8267.35-4.331395846.7521572420.4591.7053.636
Percentage of NetProceedsFromSaleOfBusinessesPropertyPlantAndEquipmentAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:OperatingExpense

ghc:OperatingExpense


Operating
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value477433497524517503477432448440365348352358300300293296291283302383383391398398379381400400381389407387382
Percentage of OperatingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets

ghc:OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value5548605631385230
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets100.0100.0100.0100.0100.0100.0100.0100.0

ghc:OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-14.57-14.78-17.647-12.739-13.02-8.572-11.665-12.03
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets-26.4-30.3-29.1-22.6-41.1-22.2-22.4-39.8

ghc:OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1924-3.9669.584268.8937.36-3.217
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets34.849.5-6.517.083.723.014.1-10.6

us-gaap:OperatingSegments, ghc:GrahamHealthcareGroup


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value9.3757.9216.7588.965104.4793.4623.122
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets17.016.211.115.931.911.66.610.3

us-gaap:OperatingSegments, ghc:Manufacturing


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value19159.445115.506131213
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets34.532.615.621.017.435.323.844.2

us-gaap:OperatingSegments, ghc:TelevisionBroadcasting


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value3634835424374538
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets66.970.3137.996.178.896.186.3126.5

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-14.78-18.692-17.618-15.443-22.429-16.923-4.45-9.251
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets-26.8-38.3-29.0-27.4-70.7-43.8-8.5-30.6

ghc:OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:HigherEducation, us-gaap:ReportableSubsegments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value2.3746.2532.4816.85317-2.024.1475.177
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets4.312.84.112.253.8-5.28.017.1

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanInternational, us-gaap:ReportableSubsegments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1410-6.008-13.75916186.533-14.226
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets25.520.9-9.9-24.450.649.112.5-47.1

us-gaap:OperatingSegments, ghc:Education, ghc:ProfessionalU.S., us-gaap:ReportableSubsegments


Operating
Period End2020-09-302019-09-30
Value5.7214.939
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets10.216.3

us-gaap:OperatingSegments, ghc:Education, ghc:SupplementalEducation, us-gaap:ReportableSubsegments


Operating
Period End2021-06-302021-03-312020-06-302020-03-31
Value8.813120.33-6.55
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets16.025.61.0-16.9

us-gaap:OperatingSegments, ghc:Education, ghc:TestPreparation, us-gaap:ReportableSubsegments


Operating
Period End2020-09-302019-09-30
Value134.959
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets23.716.4

ghc:OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanCorporateAndOther


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-6.042-4.907-7.295-2.579-6.87-1.522-8.067-4.067
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets-10.9-10.0-12.0-4.6-21.7-3.9-15.5-13.5

us-gaap:OperatingSegments, ghc:Education, us-gaap:IntersubsegmentEliminations


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-0.0010.0980.00.00.00.005-0.0030.001
Percentage of OperatingIncomeBeforeAmortizationOfIntangibleAssetsAndImpairmentOfGoodwillAndOtherLongLivedAssets-0.00.20.00.00.00.0-0.00.0

ghc:OperatingLeaseAbandonmentCost

ghc:OperatingLeaseAbandonmentCost


Operating
Period End2020-12-312020-09-30
Value786000.00
Percentage of OperatingLeaseAbandonmentCost100.00.0

ghc:OperatingLeaseAbandonmentCost us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Operating
Period End2020-12-312020-09-30
Value786000.00
Percentage of OperatingLeaseAbandonmentCost100.00.0

ghc:OperatingLeaseAbandonmentCost us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:HigherEducation, us-gaap:ReportableSubsegments


Operating
Period End2020-12-312020-09-302020-06-302020-03-31
Value9000.001442000.02000000.0
Percentage of OperatingLeaseAbandonmentCost1.10.00.00.0

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanInternational, us-gaap:ReportableSubsegments


Operating
Period End2020-12-312020-09-30
Value487000.00
Percentage of OperatingLeaseAbandonmentCost62.00.0

us-gaap:OperatingSegments, ghc:Education, ghc:ProfessionalU.S., us-gaap:ReportableSubsegments


Operating
Period End2020-09-30
Value0
Percentage of OperatingLeaseAbandonmentCost0.0

us-gaap:OperatingSegments, ghc:Education, ghc:TestPreparation, us-gaap:ReportableSubsegments


Operating
Period End2020-09-30
Value0
Percentage of OperatingLeaseAbandonmentCost0.0

ghc:PaymentsToAcquireEquityMethodCostMethodInvestmentsAndOtherInvestments

ghc:PaymentsToAcquireEquityMethodCostMethodInvestmentsAndOtherInvestments


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value2.4952.4154.0690.2870.5847.4271.6931.494203.4011.0234.3691.7584.55216559.6620.8651.723
Percentage of PaymentsToAcquireEquityMethodCostMethodInvestmentsAndOtherInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:PercentOfPlanAssetsManagedByInvestmentCompanies us-gaap:RetirementPlanType

ghc:PercentOfPlanAssetsManagedByInvestmentCompanies

us-gaap:PensionPlansDefinedBenefit


Percent
Period End2021-06-302021-03-312020-12-31
Value060.00
Percentage of PercentOfPlanAssetsManagedByInvestmentCompanies0.0100.00.0

ghc:PercentageOfUndistributedEarningsAllocatedToCommonStockholders

ghc:PercentageOfUndistributedEarningsAllocatedToCommonStockholders


Percentage
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value99.3499.330.0299.430.99441.00.00010.99440.99430.99430.00050.99340.99330.993-0.00010.99070.99060.99040.00090.9870.98680.986401.00.98181.00.00090.97890.97880.98330.01030.97420.9740.9738
Percentage of PercentageOfUndistributedEarningsAllocatedToCommonStockholders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:PercentageofRevenuefromContractwithCustomerExcludingAssessedTax us-gaap:StatementGeographical

ghc:PercentageofRevenuefromContractwithCustomerExcludingAssessedTax

country:US


Percentageof
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value78.077.0083.00.750.74-0.010.790.760.7500.780.750.74
Percentage of PercentageofRevenuefromContractwithCustomerExcludingAssessedTax100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:NonUs


Percentageof
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value22.023.0017.00.250.260.010.210.240.2500.220.250.26
Percentage of PercentageofRevenuefromContractwithCustomerExcludingAssessedTax28.229.90.020.533.335.1-100.026.631.633.30.028.233.335.1

ghc:PercentageofRevenuefromContractwithCustomerExcludingAssessedTax us-gaap:TimingOfTransferOfGoodOrService

us-gaap:TransferredAtPointInTime


Percentageof
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value34.030.0029.00.240.270.010.30.240.2400.20.20.19
Percentage of PercentageofRevenuefromContractwithCustomerExcludingAssessedTax43.639.00.034.932.036.5-100.038.031.632.00.025.626.725.7

us-gaap:TransferredOverTime


Percentageof
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value66.070.0071.00.760.73-0.010.70.760.7600.80.80.81
Percentage of PercentageofRevenuefromContractwithCustomerExcludingAssessedTax84.690.90.085.5101.398.6100.088.6100.0101.30.0102.6106.7109.5

ghc:PercentofPlanAssetsManagedInternallybyCompany us-gaap:RetirementPlanType

ghc:PercentofPlanAssetsManagedInternallybyCompany

us-gaap:PensionPlansDefinedBenefit


Percentof
Period End2021-06-302021-03-312020-12-31
Value040.00
Percentage of PercentofPlanAssetsManagedInternallybyCompany0.0100.00.0

ghc:ProceedsFromPaymentsOfVehicleFloorPlanPayableNet

ghc:ProceedsFromPaymentsOfVehicleFloorPlanPayableNet


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-12.0532.4622.14-5.237-13.5412.478-0.722-9.512159.5290.00.00.00.0
Percentage of ProceedsFromPaymentsOfVehicleFloorPlanPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

ghc:SellingGeneralandAdministrativeExpenses

ghc:SellingGeneralandAdministrativeExpenses


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value195175209164164179170175148148152131141225225228208225
Percentage of SellingGeneralandAdministrativeExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:TemporaryEquityChangeinRedemptionValue

ghc:TemporaryEquityChangeinRedemptionValue


Temporary
Period End2021-06-302021-03-312019-03-31
Value65000.0-634000.054000.0
Percentage of TemporaryEquityChangeinRedemptionValue100.0100.0100.0

ghc:UndistributedEarningsAllocatedToCommonStockholders

ghc:UndistributedEarningsAllocatedToCommonStockholders


Undistributed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value107962357011-48.53414535496656117392821217346.8183625532351-237.95841-9.48325673479168524521
Percentage of UndistributedEarningsAllocatedToCommonStockholders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:VehicleFloorPlanFacilityAssistance dei:LegalEntity

ghc:VehicleFloorPlanFacilityAssistance

ghc:Automotive


Vehicle
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value800000.0600000.0600000.0600000.0500000.0400000.0200000.0400000.0800000.0400000.0
Percentage of VehicleFloorPlanFacilityAssistance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ghc:WeightedAverageNumberOfPotentiallyDilutiveSharesOutstanding

ghc:WeightedAverageNumberOfPotentiallyDilutiveSharesOutstanding


Weighted
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value4982000.05072000.05201000.05274000.05324000.05329000.05329000.05326000.05309000.05337000.05362000.05473000.05509000.05554000.05577000.05569000.05556000.05574000.05574000.05652000.05834000.05837000.05805000.05791000.05770000.05757000.07363000.07352000.07347000.07337000.07283000.07266000.0
Percentage of WeightedAverageNumberOfPotentiallyDilutiveSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccretionExpense

us-gaap:AccretionExpense


Accretion
Period End2020-12-312020-09-30
Value2095000.0800000.0
Percentage of AccretionExpense100.0100.0

us-gaap:AssetImpairmentCharges

us-gaap:AssetImpairmentCharges


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-30
Value3.7681.0470.3421.91611168.0870.3720.6930.00.08.1090.00.00.0780.3129.20.01.6030.00.04.233248
Percentage of AssetImpairmentCharges100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.0100.0100.0100.00.0100.00.00.0100.0100.0

us-gaap:AssetImpairmentCharges us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value2.1591.0470.3421.916100.00.00.6930.00.00.0
Percentage of AssetImpairmentCharges57.3100.0100.0100.087.00.00.0100.00.00.00.0

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss


Business
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1112367818-36.4141484357825412646432152446213732624045-229.8316525
Percentage of BusinessAcquisitionsProFormaNetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessAcquisitionsProFormaRevenue

us-gaap:BusinessAcquisitionsProFormaRevenue


Business
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value841787717654732791750737705689680677659675657680584629626628601593696740700
Percentage of BusinessAcquisitionsProFormaRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1

us-gaap:BusinessCombinationConsiderationTransferred1


Business
Period End2020-12-312020-09-302019-12-312018-12-31
Value0.00.0200.2
Percentage of BusinessCombinationConsiderationTransferred10.00.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

ghc:Leaf, us-gaap:AllOtherSegments


Business
Period End2021-06-14
Value308
Percentage of BusinessCombinationConsiderationTransferred10.0

us-gaap:BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1

us-gaap:BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1


Business
Period End2020-09-30
Value5700000.0
Percentage of BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1100.0

us-gaap:BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual

us-gaap:BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual


Business
Period End2020-12-312020-09-302020-06-302019-09-302018-09-302018-06-302017-09-302016-09-302016-06-30
Value7.64.22.1-2.00.0-0.84.0-2.25.1
Percentage of BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual

us-gaap:BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual


Business
Period End2020-12-312020-09-302020-06-302019-09-302018-09-302018-06-302017-09-302017-06-302016-09-302016-06-30
Value149.24.396102.164636.113
Percentage of BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain

us-gaap:BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain


Business
Period End2020-12-312020-09-302020-06-302019-06-30
Value003708000.00
Percentage of BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain0.00.0100.00.0

us-gaap:CapitalizedContractCostAmortization

us-gaap:CapitalizedContractCostAmortization


Capitalized
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value-13.894-13.298-19.687-23.0129.213-15.6421011
Percentage of CapitalizedContractCostAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized


Contract
Period End2021-06-302021-03-31
Value81145
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0

us-gaap:DebtInstrumentInterestRateDuringPeriod

us-gaap:DebtInstrumentInterestRateDuringPeriod


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value4.95.005.00.0510.05100.0510.0510.051-0.0010.0510.0580.06200.0630.0620.063-0.0020.0620.0720.0720.0010.0720.0680.07100.070.070.07-0.0030.070.07
Percentage of DebtInstrumentInterestRateDuringPeriod100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentInterestRateDuringPeriod dei:LegalEntity, us-gaap:DebtInstrument

ghc:Automotive, ghc:VehicleFloorPlanFacility


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.21.2-0.21.20.0160.026-0.0010.0340.0340.035
Percentage of DebtInstrumentInterestRateDuringPeriod24.524.00.024.031.451.00.066.766.768.6

us-gaap:DeferredRevenueRevenueRecognized1 ghc:CARESActFund, us-gaap:StatementBusinessSegments, us-gaap:UnusualOrInfrequentItem

us-gaap:DeferredRevenueRevenueRecognized1

ghc:MedicareAcceleratedAdvancedPaymentProgramReliefFund, ghc:GrahamHealthcareGroup, ghc:CARESActReliefFromCOVID19


Deferred
Period End2021-06-30
Value5.0
Percentage of DeferredRevenueRevenueRecognized1100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.7361.0191.0121.0120.9271.0971.091.091.091.091.0190.9210.9210.9220.9740.9720.9720.9730.3750.3760.376
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1.6712.8920.00.00.00.0-0.0370.0372.9752.9742.9741.0461.0381.0391.0391.2940.00.00.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses227.0283.80.00.00.00.0-3.43.4292.0322.9322.9113.4106.6106.9106.9133.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-1.483-1.482-1.317-1.316-1.317-1.317-0.578-0.579-0.578-0.579-0.601-0.6-0.601-0.601-0.443-0.444-0.443-0.444-0.664-0.665-0.665
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses-201.5-145.4-130.1-130.0-142.1-120.1-53.0-53.1-53.0-53.1-59.0-65.1-65.3-65.2-45.5-45.7-45.6-45.6-177.1-176.9-176.9

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-2000.0-2000.0-120000.0-120000.0-121000.0-120000.0-1841000.0-1841000.0-1840000.0-1841000.0-1276000.0-44000.0-44000.0-44000.0-36000.0-38000.0-37000.0-37000.0-84000.0-83000.0-84000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value712000.0711000.0707000.0708000.0707000.0708000.0824000.0824000.0825000.0409000.036000.036000.036000.042000.042000.042000.043000.043000.074000.074000.075000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-35600.0-35550.0-589.2-590.0-584.3-590.0-44.8-44.8-44.8-22.2-2.8-81.8-81.8-95.5-116.7-110.5-116.2-116.2-88.1-89.2-89.3

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value82000.083000.083000.083000.082000.083000.085000.085000.084000.085000.078000.077000.078000.078000.0113000.0114000.0114000.0114000.0115000.0114000.0114000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-4100.0-4150.0-69.2-69.2-67.8-69.2-4.6-4.6-4.6-4.6-6.1-175.0-177.3-177.3-313.9-300.0-308.1-308.1-136.9-137.3-135.7

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod


Defined
Period End2020-12-312020-09-302018-12-312017-12-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-03
Value-0.0167.7830.00.8930.00.8723.7340.00.00.03.8840.04.490.00.08.442140.07.4860.01.0220.2040.00.00.430.00.0
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod100.0100.00.0100.00.0100.0100.00.00.00.0100.00.0100.00.00.0100.0100.00.0100.00.0100.0100.00.00.0100.00.00.0

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod dei:LegalEntity, ghc:EarlyRetirmentProgramExpense, us-gaap:RetirementPlanType

ghc:Dekko, ghc:SeparationIncentiveProgram, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-30
Value1.1
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod0.0

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod ghc:EarlyRetirmentProgramExpense, us-gaap:RetirementPlanType, us-gaap:StatementBusinessSegments

ghc:SeparationIncentiveProgram, us-gaap:PensionPlansDefinedBenefit, ghc:Education


Defined
Period End2020-09-302019-12-312019-06-302017-12-31
Value7.80.06.60.9
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod100.20.00.0100.8

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Defined
Period End2020-12-312020-09-30
Value-0.0167.783
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod100.0100.0

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:HigherEducation, us-gaap:ReportableSubsegments


Defined
Period End2020-12-312020-09-30
Value0.00.802
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod-0.010.3

us-gaap:OperatingSegments, ghc:Education, ghc:ProfessionalU.S., us-gaap:ReportableSubsegments


Defined
Period End2020-09-30
Value1.458
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod18.7

us-gaap:OperatingSegments, ghc:Education, ghc:TestPreparation, us-gaap:ReportableSubsegments


Defined
Period End2020-09-30
Value4.829
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod62.0

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanCorporateAndOther


Defined
Period End2020-12-312020-09-30
Value0.00.694
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod-0.08.9

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302016-12-312016-09-30
Value1.118-0.0167.7836.0140.0-0.1756.6070.00.00.00.8930.9320.00.0
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod0.0100.0100.00.00.00.00.00.00.00.0100.00.00.00.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value333428282828303030303131323230303030303030
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.010.0360.0420.0410.0220.0620.0730.0720.0720.0720.1110.170.1690.170.1950.1950.1940.1950.3070.3080.307
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value6.7546.6548.1398.1398.148.169111111111111111111111111121212
Percentage of DefinedBenefitPlanInterestCost67540.018483.319378.619851.237000.013175.816086.316309.716309.716100.010670.36967.17008.36620.66143.66143.66174.76146.74184.04170.54184.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.7350.7360.9190.920.920.9191.0781.0791.0791.0780.9660.9670.9660.9661.0581.0591.0581.0581.0961.0961.096
Percentage of DefinedBenefitPlanInterestCost7350.02044.42188.12243.94181.81482.31476.71498.61498.61497.2870.3568.8571.6568.2542.6543.1545.4542.6357.0355.8357.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-20.912-24.501-6.26-7.625-13.7845.0965.1424.9635.2214.4914.4734.3174.944.591-13.832-14.829-14.688-30.383-12.389-12.266-12.059-19.48-16.255-11.44-11.432-18.686-13.32-17.919-12.188-9.058-2.73312186.02122.4423.2141.1291.4891.458-0.1411.741-1.732-16.9360.435
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-0.728-0.985-1.09-1.091-1.026-1.155-2.858-2.859-2.858-2.859-5.475-0.528-0.528-0.528-0.558-0.558-0.558-0.5580.1950.1950.194
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost3.54.00.017.413.58.4-56.1-55.6-57.6-54.8-121.9-11.8-12.2-10.7-12.24.03.83.8-0.6-1.6-1.6

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-20.912-24.501-13.904-6.26-7.625-13.784-104.848-13.298-6.11-13.653-45.49-18.59-19.573-18.101-13.865-13.832-14.829-14.688-30.383-12.389-12.266
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.00.0100.0100.0100.0-2057.5-258.6-123.1-261.5-1012.9-415.6-453.4-366.4-302.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value2.5562.5562.5582.5572.5582.5571.9561.9571.9561.9561.851.8491.8491.851.8291.8311.831.832.1222.1212.121
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-12.2-10.40.0-40.8-33.5-18.638.438.139.437.541.241.342.837.439.8-13.2-12.3-12.5-7.0-17.1-17.3

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DefinedBenefitPlanServiceCost


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value5.8775.6025.6125.4575.8045.7835.0965.1424.963
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1.6821.5481.4261.4261.4661.3861.21.21.231
Percentage of DefinedBenefitPlanServiceCost28.627.625.426.125.324.023.523.324.8

us-gaap:DefinedBenefitPlanServiceCost us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2.3982.2832.4972.352.5922.5852.5962.6032.522
Percentage of DefinedBenefitPlanServiceCost40.840.844.543.144.744.750.950.650.8

us-gaap:OperatingSegments, ghc:GrahamHealthcareGroup


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.1080.1720.1360.1360.1120.1590.1230.1230.063
Percentage of DefinedBenefitPlanServiceCost1.83.12.42.51.92.72.42.41.3

us-gaap:OperatingSegments, ghc:Manufacturing


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.2460.3950.3170.3180.3950.3940.020.020.015
Percentage of DefinedBenefitPlanServiceCost4.27.15.65.86.86.80.40.40.3

us-gaap:OperatingSegments, ghc:TelevisionBroadcasting


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.9560.8350.8140.8170.8360.7960.7520.7620.78
Percentage of DefinedBenefitPlanServiceCost16.314.914.515.014.413.814.814.815.7

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.4870.3690.4220.410.2410.4630.4050.4340.161
Percentage of DefinedBenefitPlanServiceCost8.36.67.57.54.28.07.98.43.2

us-gaap:DefinedBenefitPlanServiceCost us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:HigherEducation, us-gaap:ReportableSubsegments


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1.1371.0831.0370.9731.071.071.1341.1361.102
Percentage of DefinedBenefitPlanServiceCost19.319.318.517.818.418.522.322.122.2

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanInternational, us-gaap:ReportableSubsegments


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.0770.0710.0990.1020.120.1120.1130.1140.11
Percentage of DefinedBenefitPlanServiceCost1.31.31.81.92.11.92.22.22.2

us-gaap:OperatingSegments, ghc:Education, ghc:ProfessionalU.S., us-gaap:ReportableSubsegments


Defined
Period End2020-09-302020-06-302019-09-302019-06-30
Value0.2380.2610.340.329
Percentage of DefinedBenefitPlanServiceCost4.44.56.66.6

us-gaap:OperatingSegments, ghc:Education, ghc:SupplementalEducation, us-gaap:ReportableSubsegments


Defined
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.9760.9311.0841.085
Percentage of DefinedBenefitPlanServiceCost16.616.618.718.8

us-gaap:OperatingSegments, ghc:Education, ghc:TestPreparation, us-gaap:ReportableSubsegments


Defined
Period End2020-09-302020-06-302019-09-302019-06-30
Value0.7480.8230.8470.821
Percentage of DefinedBenefitPlanServiceCost13.714.216.516.5

us-gaap:DefinedBenefitPlanServiceCost us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanCorporateAndOther


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.2080.1980.3090.2890.3180.3180.1660.1660.16
Percentage of DefinedBenefitPlanServiceCost3.53.55.55.35.55.53.33.23.2

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value5.8775.6025.6125.4575.8045.7835.0965.1424.9635.2214.4914.4734.3174.944.5914.5914.5914.9145.0395.045.04
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.2560.2550.2390.2380.2390.2380.2150.2140.2150.2140.2050.2050.2040.2050.2150.2140.2150.2140.2470.2460.246
Percentage of DefinedBenefitPlanServiceCost4.44.64.34.44.14.14.24.24.30.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value16161618221616151313141313141516151415161616151461584553525477556365796362626462636363606161
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Depreciationus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.1580.1680.1780.1770.1760.1750.1740.2190.2420.240.2490.2520.2530.2530.2580.2790.2910.290.2910.2910.280.254
Percentage of Depreciation1.01.01.11.00.81.01.11.41.71.81.71.81.91.71.61.71.82.01.91.81.71.5

us-gaap:Depreciation us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Depreciationus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value7.4827.787.2846.822107.3297.0596.2586.1376.2016.9696.6856.8397.6067.9128.0858.3258.5849.8659.9771011
Percentage of Depreciation45.147.045.136.945.143.942.840.844.245.947.049.050.251.949.550.552.558.662.862.063.866.2

us-gaap:OperatingSegments, ghc:GrahamHealthcareGroup


Depreciationus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.3310.3170.3140.3180.4930.540.5310.5660.6070.610.6290.6480.6470.6531.1541.1661.194
Percentage of Depreciation2.01.91.91.72.23.23.23.74.44.54.24.74.84.57.27.37.5

us-gaap:OperatingSegments, ghc:Manufacturing


Depreciationus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.4272.5172.7232.5572.5262.5272.5482.6712.3842.4332.42.3332.3312.451
Percentage of Depreciation14.615.216.913.811.015.115.417.417.218.016.217.117.116.7

us-gaap:OperatingSegments, ghc:TelevisionBroadcasting


Depreciationus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3.5433.4733.6423.3993.4463.3432.9783.3073.2933.2393.9613.1982.9743.0713.4763.1182.9912.5942.5752.542.452.377
Percentage of Depreciation21.321.022.518.415.020.018.121.523.724.026.723.421.821.021.719.518.817.716.415.815.314.2

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Depreciationus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2.6592.292.0185.2085.8272.6693.081.9743.6053.2330.4282.8652.9063.0594.3384.524.2643.1842.9863.2893.0733.027
Percentage of Depreciation16.013.812.528.225.416.018.712.926.023.92.921.021.320.927.128.226.921.719.020.419.218.1

us-gaap:Depreciation us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:HigherEducation, us-gaap:ReportableSubsegments


Depreciationus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.8730.8520.8450.6820.8320.7230.8170.840.6290.5970.7790.9151.2741.8581.9752.7683.2493.4314.4974.1573.9934.175
Percentage of Depreciation5.35.15.23.73.64.35.05.54.54.45.36.79.412.712.417.320.523.428.625.824.924.9

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanInternational, us-gaap:ReportableSubsegments


Depreciationus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value4.8355.2524.784.5855.6194.5784.1963.63.7163.8824.2583.7593.7643.9743.8213.783.6093.6823.7844.364.3195.06
Percentage of Depreciation29.131.729.624.824.527.425.423.526.828.728.727.527.627.123.923.622.725.124.127.126.930.2

us-gaap:OperatingSegments, ghc:Education, ghc:ProfessionalU.S., us-gaap:ReportableSubsegments


Depreciationus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.1191.1651.1131.0460.9780.9590.8650.9250.8590.670.6420.7350.7580.7650.783
Percentage of Depreciation6.15.16.76.36.46.96.46.26.34.94.44.64.74.85.3

us-gaap:OperatingSegments, ghc:Education, ghc:SupplementalEducation, us-gaap:ReportableSubsegments


Depreciationus-gaap:
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.671.5763.7721.939
Percentage of Depreciation10.19.516.511.6

us-gaap:OperatingSegments, ghc:Education, ghc:TestPreparation, us-gaap:ReportableSubsegments


Depreciationus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.3352.6070.8260.9260.7740.7790.8050.9571.0330.9730.9781.2061.4071.3321.3411.451.4411.6151.781
Percentage of Depreciation1.811.44.95.65.05.66.06.57.67.16.77.58.88.49.29.29.010.110.6

us-gaap:Depreciation us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanCorporateAndOther


Depreciationus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.1040.10.10.1010.1010.0890.0740.0660.0540.0520.050.1190.1580.1540.1750.130.1350.130.1340.0190.3150.087
Percentage of Depreciation0.60.60.60.50.40.50.40.40.40.40.30.91.21.11.10.80.90.90.90.12.00.5

us-gaap:DividendsCommonStock

us-gaap:DividendsCommonStock


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value7.553157.17.581157.3867.388147.0486.94914
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value7.553157.17.581157.3867.388147.0486.94914
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value7.503150.0067.0597.53915-0.0027.3457.34614-0.0247.0016.90114-56.1266.9817.01314-53.9386.7086.68513-104.236.6211530-132.0331414370.00.00.00.0
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.331-1.0155.7072.2242.731-7.6844.943-2.955-0.9981.776-2.9310.136-8.5234.1711.0522.7422.8164.21-7.882-1.305
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentRealizedGainLossOnDisposal

us-gaap:EquityMethodInvestmentRealizedGainLossOnDisposal


Equity
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302015-12-312015-09-302014-12-312014-09-30
Value0.00.01.473-0.1030.00.00.0280.00.00.00.00.00.00.00.03960.0
Percentage of EquityMethodInvestmentRealizedGainLossOnDisposal0.00.0100.0100.00.00.00.0100.00.00.00.00.00.00.00.00.0100.00.0

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiGainLoss


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value8379615939-100.39349177.79124-44.14944-2.554-14.1020.00.00.0
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:EquitySecuritiesFvNiRealizedGain

us-gaap:EquitySecuritiesFvNiRealizedGain


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value6699000.094000.00521000.00518000.08000.0259000.00
Percentage of EquitySecuritiesFvNiRealizedGain100.0100.00.0100.00.0100.0100.0100.00.0

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGainLoss


Equity
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8161000.000-4608000.0-8774000.0-109000.0-61000.0-2000.02982000.000-1660000.0-2611000.0
Percentage of EquitySecuritiesFvNiRealizedGainLoss100.00.00.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7579615944-91.61949177.79321-44.14944-0.894-11.491
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount


Equity
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value4800000.0002600000.00000197000.02500000.0
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount100.00.00.0100.00.00.00.00.0100.0100.0

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-30
Value7.82.70.01.62.60.00.03.70.01.33.28.50.00.0
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount100.0100.00.0100.0100.00.00.0100.00.0100.0100.0100.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements

us-gaap:FairValueInputsLevel3, ghc:ContingentConsiderationLiabilities


Fair
Period End2021-06-302021-03-31
Value171.849
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements100.0100.0

us-gaap:FairValueInputsLevel3, ghc:MandatorilyRedeemableNoncontrollingInterest


Fair
Period End2021-06-302021-03-31
Value0.0220.019
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements0.11.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax


Foreign
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-04
Value0.6770.003-3.03-2.343-1.074.29-2.3540.6610.1090.514-1.639-0.116-2.2660.177-3.2981.4143.4661.728-6.566-3.797-24.084-5.4430.627-12.9723.608-6.827-8.511-10.5642.9095.037-4.0327.886-12.622-4.614-0.0473.111-2.5922.660.412-6.7070.3312.7011.88111-3.751
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDispositionOfAssets1

us-gaap:GainLossOnDispositionOfAssets1


Gain
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value140.240.4745.628-0.184-0.11-0.22329-13.2310.7813.8598.7390.304-0.102-0.067-0.335-92.581-0.141412018-26.6742.5254.515
Percentage of GainLossOnDispositionOfAssets1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfBusiness

us-gaap:GainLossOnSaleOfBusiness


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value0.6440.8022100.7551.6530.107-1.4710.4860.2320.1890.00.9161.3345.907-0.2270.00.0-0.3420.00.00.0180.0-26.2532.9180.00.00.00.0
Percentage of GainLossOnSaleOfBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.00.0100.00.00.00.0100.00.0100.0100.00.00.00.00.0

us-gaap:GainLossOnSaleOfBusiness us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ghc:Megaphone


Gain
Period End2020-12-31
Value209
Percentage of GainLossOnSaleOfBusiness99.5

us-gaap:GoodwillForeignCurrencyTranslationGainLoss

us-gaap:GoodwillForeignCurrencyTranslationGainLoss


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.3720.387291814-32.36122-14.595-10.1599.048-12.806-2.05-29.793120.768131214-28.466-3.647-24.1492.012
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss us-gaap:StatementBusinessSegments

ghc:Education


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.3720.387291814-32.36122-14.595-10.1599.048-12.806-2.05-29.793120.768131214-28.466-3.647-24.1492.012
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss us-gaap:StatementBusinessSegments, us-gaap:Subsegments

ghc:Education, ghc:KaplanInternational


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.3350.361291814-32.22122-14.578-10.2019.019-12.724-2.085-29.737120.789131214-28.406-3.635-24.1521.899
Percentage of GoodwillForeignCurrencyTranslationGainLoss97.393.399.799.899.699.699.999.9100.499.799.4101.799.8100.4102.799.499.799.899.899.7100.094.4

ghc:Education, ghc:KaplanProfessional


Goodwill
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0390.057-0.140.025-0.0170.0420.029-0.0820.035-0.056-0.005
Percentage of GoodwillForeignCurrencyTranslationGainLoss0.20.40.40.10.1-0.40.30.6-1.70.2-0.0

ghc:Education, ghc:SupplementalEducation


Goodwill
Period End2021-06-302021-03-31
Value0.0370.026
Percentage of GoodwillForeignCurrencyTranslationGainLoss2.76.7

us-gaap:GoodwillImpairmentLoss

us-gaap:GoodwillImpairmentLoss


Goodwill
Period End2020-12-312020-09-302020-06-302020-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302012-12-312011-12-312011-10-022011-07-032011-04-03
Value0.00.00.06.8780.00.01.6030.00.00.04992481020.0110.00.0
Percentage of GoodwillImpairmentLoss0.00.00.0100.00.00.0100.00.00.00.0100.0100.0100.00.0100.00.00.0

us-gaap:GoodwillImpairmentLoss us-gaap:StatementBusinessSegments

us-gaap:AllOtherSegments


Goodwill
Period End2020-12-312020-09-302020-06-302020-03-312016-12-31
Value0.00.00.06.8781.6
Percentage of GoodwillImpairmentLoss0.00.00.0100.099.8

us-gaap:GoodwillPurchaseAccountingAdjustments

us-gaap:GoodwillPurchaseAccountingAdjustments


Goodwill
Period End2020-12-312020-09-302016-12-312016-09-30
Value00-289000.0-20200000.0
Percentage of GoodwillPurchaseAccountingAdjustments0.00.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value1.776132.9374.0921.182-1.5473.8354.6831.4671.6791.4269.5370.9312.579-4.697-0.5321.3310.649-7.042-1.008-0.8911.004-0.0350.095-0.353-0.4040.2024.613914.0520.0375.8923.8683.4182.7854.0993.3143.8880.568-1.4943.1383.737-0.1912.142.027-8.109
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-10-022011-07-032011-04-032010-04-04
Value-6.18811-3.8081.479-2.716-1.547-1.2043.4861.417-1.0210.3127.3490.832.115-5.08-0.5321.3170.649-7.964-1.008-0.8911.004-0.2650.095-0.354-0.5940.202-2.24944.0525.8913.8693.4083.3753.5113.691-1.4943.1383.737-8.109
Percentage of IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value14-29.9653233-2.02-97.47613-4.58328-84.66350-23.08313-85.955820.399-8.07-55.58496-42.71150-45.93-11.2112675-28.337173223-112.8112967-15.228-43.487-9.339-0.74-1.317-22.828-38.128-43.75545-90.647382437-58.96
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInDeferredRevenue


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-54.936-6.6550.36643-56.315-12.795.56791-50.083-16.459-23.34784-37.41-8.783-13.35156-34.3094.603-11.46247-37.44617-39.94533-33.598-11.621-32.7276-31.95825-35.31945-29.509154.41235-19.3493.647-10.95729-39.34311-52.23552-72.96562
Percentage of IncreaseDecreaseInDeferredRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInIncomeTaxes

us-gaap:IncreaseDecreaseInIncomeTaxes


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-0.179103.56.24421-27.774-3.698-1.252-11.18617-13.668-3.257.60518108.10312-6.49-22.091-11.7832117-14.836-39.01-3.028-117.45278-2.499-2.65673-40.2367.454122.27323-39.164-7.19611
Percentage of IncreaseDecreaseInIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements us-gaap:AwardType

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:EmployeeStockOption


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value17000.010000.0-1000.012000.05000.00-1000.044000.044000.042000.01000.035000.037000.037000.0-1000.036000.038000.034000.0030000.030000.029000.00030000.033000.02000.025000.024000.026000.04000.015000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInterest


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1876000.0890000.0876000.0890000.0954000.01151000.01398000.01474000.01579000.01700000.01469000.0611000.01901000.01372000.03184000.0861000.01173000.01363000.01041000.0740000.0721000.0591000.0546000.0481000.0323000.0559000.0
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms, us-gaap:StatementBusinessSegments

us-gaap:SecuritiesSubjectToMandatoryRedemption, ghc:GrahamHealthcareGroup


Investment
Period End2021-06-30
Value1000000.0
Percentage of InvestmentIncomeInterest53.3

us-gaap:MarketableSecuritiesRealizedGainLoss

us-gaap:MarketableSecuritiesRealizedGainLoss


Marketable
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.00.025-2.0-0.1-0.10.09.70.00.00.00.0-8.0470.04.5021.754-0.0140.00.00.00.00.0-2.259-0.785-10.4380.00.3370.542
Percentage of MarketableSecuritiesRealizedGainLoss0.00.0100.0100.0100.0100.00.0100.00.00.00.00.0100.00.0100.0100.0100.00.00.00.00.00.0100.0100.0100.00.0100.0100.0

us-gaap:MinorityInterestChangeInRedemptionValue

us-gaap:MinorityInterestChangeInRedemptionValue


Minority
Period End2021-06-302021-03-312019-03-31
Value65000.0761000.0-54000.0
Percentage of MinorityInterestChangeInRedemptionValue100.0100.0100.0

us-gaap:MinorityInterestChangeInRedemptionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Minority
Period End2021-03-312019-03-31
Value697000.0-54000.0
Percentage of MinorityInterestChangeInRedemptionValue91.6100.0

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-31
Value65000.064000.0
Percentage of MinorityInterestChangeInRedemptionValue100.08.4

us-gaap:MinorityInterestDecreaseFromRedemptions

us-gaap:MinorityInterestDecreaseFromRedemptions


Minority
Period End2021-03-312019-03-31
Value3508000.0550000.0
Percentage of MinorityInterestDecreaseFromRedemptions100.0100.0

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest


Net
Period End2021-06-302020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-131000.066000.045000.0126000.027000.010000.016000.06000.070000.073000.0
Percentage of NetIncomeLossAttributableToRedeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-131000.066000.045000.0126000.027000.010000.016000.06000.070000.073000.0
Percentage of NetIncomeLossAttributableToRedeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent

us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-25.216-28.787-18.287-10.489-12.136-18.403-111.061-19.556-12.253-19.928-53.9-22.214-23.041-21.386-17.657-17.621-18.62-18.801
Percentage of NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable

us-gaap:NoncontrollingInterest


Noncontrolling
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-699000.0-185000.0-373000.037000.0-772000.0-207000.0104000.0-62000.0
Percentage of NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetainedEarnings


Noncontrolling
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value699000.0185000.0373000.0-37000.0772000.0207000.0-104000.062000.0
Percentage of NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:OperatingLeaseImpairmentLoss

us-gaap:OperatingLeaseImpairmentLoss


Operating
Period End2020-12-312020-09-30
Value0.2351.71
Percentage of OperatingLeaseImpairmentLoss100.0100.0

us-gaap:OperatingLeaseImpairmentLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ghc:Education


Operating
Period End2020-12-312020-09-30
Value0.2831.71
Percentage of OperatingLeaseImpairmentLoss120.4100.0

us-gaap:OperatingLeaseImpairmentLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments, us-gaap:SubsegmentsConsolidationItems

us-gaap:OperatingSegments, ghc:Education, ghc:KaplanInternational, us-gaap:ReportableSubsegments


Operating
Period End2020-12-312020-09-30
Value0.1860.0
Percentage of OperatingLeaseImpairmentLoss79.10.0

us-gaap:OperatingSegments, ghc:Education, ghc:ProfessionalU.S., us-gaap:ReportableSubsegments


Operating
Period End2020-09-30
Value0.0
Percentage of OperatingLeaseImpairmentLoss0.0

us-gaap:OperatingSegments, ghc:Education, ghc:TestPreparation, us-gaap:ReportableSubsegments


Operating
Period End2020-09-30
Value1.71
Percentage of OperatingLeaseImpairmentLoss100.0

us-gaap:OperatingLeaseRightOfUseAssetAmortizationExpense

us-gaap:OperatingLeaseRightOfUseAssetAmortizationExpense


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1818191927232220
Percentage of OperatingLeaseRightOfUseAssetAmortizationExpense100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherAssetImpairmentCharges

us-gaap:OtherAssetImpairmentCharges


Other
Period End2021-06-302021-03-312020-09-302020-06-302019-09-302019-06-30
Value3.81.01.9110.40.7
Percentage of OtherAssetImpairmentCharges100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-03
Value1.167-0.486322016-37.37623-16.684-11.10410-13.137-2.844-31.16711-1.601119.63813-20.52-0.353-5.1213.845-1.511-10.5485.249-12.088-8.95-9.7771.920.7461.0025.639-3.509-4.1911.3895.321-8.9117.823-1.464-32.9695.0887.97
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value792000.0792000.0670000.0671000.0668000.0671000.0-932000.0-932000.0-931000.0-1347000.0-1162000.069000.070000.076000.0119000.0118000.0120000.0120000.0105000.0105000.0105000.0104000.068000.068000.070000.069000.0-102000.0-101000.0-102000.0-102000.0-178000.0-384000.0-384000.0-437000.0-469000.0-469000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-0.1430.3230.056-0.045-0.234-1.253-0.344-0.3360.079-0.3050.010.043
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1.167-0.486322016-37.37623-16.684-11.10410-13.137-2.844-31.16711-1.601119.63813-20.52-0.353-5.1213.845-1.511-10.5485.249-12.088-8.95-9.7771.920.746
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax-816.1-150.557469.6-45400.0-7010.72982.9-6722.74965.5-14055.7-3289.5-131370.0-6614.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value1.024-0.1632982016-38.629187-17.02-11.0259.728-83.756-2.801-30.8311154401719-72.26.97
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax-716.1-50.5533498.2-45300.0-6910.73082.9-54450.35065.5-13955.7-3189.5-837560.0-6514.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossBeforeTax

us-gaap:OtherComprehensiveIncomeLossBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1.048-1.5023982117-38.063156-18.604-12.477.671-144.76-6.076-34.0210217572221-115.96512-14.5362.828-191.44-4.84-5.992-20.13-151.104-7.339-262.76226648.21229421020.286-2.307
Percentage of OtherComprehensiveIncomeLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-0.132-1.6373660.9751.0580.891132-1.443-1.406-1.895-131.573-3.226-3.224-1.291178-1.449-1.448-1.703-151.5140.3940.3940.394-217.042-4.1540.698
Percentage of OtherComprehensiveIncomeLossBeforeTax-12.6109.091.94.56.1-2.384.37.811.3-24.790.953.19.5-12.381.8-2.5-6.5-8.0130.73.2-2.713.9113.485.8-11.6

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.0130.6210.2820.157-0.143-1.578-0.44-0.4770.04-0.467-0.05-0.0060.3710.2360.327-0.072-0.019
Percentage of OtherComprehensiveIncomeLossBeforeTax1.2-41.30.10.7-0.84.1-0.32.6-0.3-6.10.00.1-1.12.20.2-0.1-0.1

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-30
Value1.167-0.486322016-37.37625-16.684-11.10410-13.137-2.844-31.16711-20.52-0.353-5.121-1.511-4.5224.765
Percentage of OtherComprehensiveIncomeLossBeforeTax111.432.48.194.894.798.216.089.789.0130.89.146.891.6110.017.7-2.935.20.893.4-79.5

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value13000.0621000.0282000.0157000.0-143000.0-1578000.0-440000.0-477000.040000.0-467000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value0.1321.637-366.07-0.975-1.058-0.891-132.2591.4431.4061.8951313.2263.2241.291-178.1491.4491.4481.703151-0.394-0.394-0.3942174.154-0.698-0.6981587.5267.5277.284642-1.62-1.621.59194-2.123-2.12
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.9242.429-0.305-0.304-0.39-0.220.5120.5110.4750.5483.3933.2953.2941.3671.5691.5671.5681.823-0.289-0.289-0.289-0.295.4875.676-0.628-0.6297.387.4257.4257.1823.229-2.004-2.004-2.317-2.529-2.592
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeLossTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-042010-04-04
Value-0.032-0.299980.2990.252-0.1235-0.518-0.375-0.619-35.534-0.874-0.799-0.30364185.0083.117-38.1015.039-3.766-0.407-75.97-0.127-4.303-3.202-56.6990.975-105.8748.5662651.028131840-1.4512.638132.186-15.316-9.115422.444-33.00834
Percentage of OtherComprehensiveIncomeLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-0.035-0.443980.2630.2850.24135-0.39-0.38-0.511-35.524-0.873-0.869-0.34847-0.58-0.579-0.681-60.6050.1570.1580.157-86.815-1.6620.279
Percentage of OtherComprehensiveIncomeLossTax109.4148.299.988.0113.1-200.8100.375.3101.382.6100.099.9108.8114.974.6-3.1-11.6-21.8159.13.1-4.2-38.6114.31308.7-6.5

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.0030.1440.0650.036-0.033-0.361-0.112-0.1280.005-0.108-0.01-0.0010.070.0450.062-0.014-0.004
Percentage of OtherComprehensiveIncomeLossTax-9.4-48.20.112.0-13.1300.8-0.324.7-1.317.40.00.1-8.8-14.90.1-0.1-0.1

us-gaap:OtherNonoperatingGainsLosses

us-gaap:OtherNonoperatingGainsLosses


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-022011-07-032011-04-032011-01-022010-10-032010-07-04
Value319000.02698000.01531000.0-349000.0-235000.0453000.01188000.0519000.0887000.0-346000.03622000.0-3645000.0723000.0258000.0869000.0749000.0603000.0-537000.0-490000.0572000.01278000.0-146000.0394000.0-1233000.0325000.0-250000.0-602000.0-159000.0731000.01351000.02030000.0206000.0-574000.0710000.0594000.01164000.0-179000.0111000.0894000.0385000.027000.0131000.0276000.0563000.0-56000.0
Percentage of OtherNonoperatingGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherOperatingActivitiesCashFlowStatement


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value96000.01298000.0284000.0504000.0137000.0-496000.0-354000.0-90000.0297000.0380000.0249000.0170000.01331000.0404000.0618000.0159000.0257000.0103000.0-66000.0169000.0333000.0169000.0169000.0612000.0217000.0272000.03681000.0-1699000.0-34000.0145000.02757000.0350000.0477000.0513000.0
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities


Payment
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value291.340.02.5872.4230.00.0
Percentage of PaymentForContingentConsiderationLiabilityFinancingActivities100.0100.00.0100.0100.00.00.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-03-312020-12-312016-12-312015-12