GNTX


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

Table of contents



us-gaap:CommonStockValue

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:ComprehensiveIncomeNetOfTax
us-gaap:StatementEquityComponents

us-gaap:CostOfGoodsAndServicesSold

us-gaap:GrossProfit

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

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

us-gaap:InterestExpenseDebt

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingExpenses

us-gaap:OperatingIncomeLoss
us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

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

us-gaap:ResearchAndDevelopmentExpense

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementGeographical
us-gaap:StatementBusinessSegments

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementGeographical
us-gaap:StatementBusinessSegments

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:Assets
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ShortTermInvestments

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet

us-gaap:InventoryFinishedGoods

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:MachineryAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:ConstructionInProgressGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:LongTermInvestments

us-gaap:Goodwill
us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition, us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill
us-gaap:BusinessAcquisition
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:DividendsPayableCurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent
us-gaap:LongtermDebtType
us-gaap:LongTermDebt

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInOperatingActivities

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

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt
us-gaap:LongtermDebtType

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:Dividends
us-gaap:SubsequentEventType

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

gntx:GainOnDisposalOfAssets

gntx:LossOnDispositionOfAssets

gntx:NetDecreaseinCommonStockSharesfromSharesIssuedinShareBasedCompensationandSharesRepurchased
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:GainOnSaleOfInvestments
us-gaap:BusinessAcquisition
us-gaap:GoodwillAcquiredDuringPeriod

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:InvestmentIncomeNonoperating

us-gaap:LossOnSaleOfInvestments

us-gaap:NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:AwardType
us-gaap:RestrictedStockExpense
us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:StockIssuedDuringPeriodSharesAcquisitions

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueAcquisitions
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedDuringPeriodShares

us-gaap:StockRepurchasedDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment
us-gaap:BusinessAcquisition
gntx:BusinessAcquisitionAgreementValue
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:FinancialInstrument
gntx:DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveYearsFairValue

gntx:DeferredTaxLiabilitiesDeferredExpenseExcessTaxOverBookDepreciation

gntx:LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour

gntx:PatentAndOtherAssetsNet

gntx:PatentandOtherAssetsNet

gntx:PercentageNetSalesInvoicedAndPaidInForeignCurrencies

us-gaap:AccruedRoyaltiesCurrent

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:BuildingsAndImprovementsGross
us-gaap:IncomeStatementLocation
us-gaap:BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet

us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DebtSecuritiesAvailableForSaleAmortizedCostCurrent
us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
us-gaap:PlanName
us-gaap:DeferredCompensationEquity

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:EmployeeRelatedLiabilitiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:PlanName

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue

us-gaap:IntangibleAssetsGrossExcludingGoodwill
us-gaap:BusinessAcquisition
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:InventoryRawMaterials

us-gaap:InventoryWorkInProcess

us-gaap:InvestmentsAndCash
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:InvestmentsFairValueDisclosure

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Interest Expense Debt
Balance Sheet
Operating Lease Liability
Assets
Inventory Net
Current Assets
Prepaid Expense And Other Assets Current
NonCurrent Assets
Long Term Investments
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Operating Lease Liability Current
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Financing 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 Noncurrent
NonoperatingIncomeExpense
Other Nonoperating Income Expense
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
InventoryNet
Inventory Finished Goods

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ▅▆▆▆▆▆▆▆▆▆▆▆▇▇▇▇███████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁14.33799514.49232914.62157214.70370314.74652914.69193915.07665115.1788615.28674715.3350615.55971715.7270316.13538716.43126316.81687917.03879117.17251717.26654517.26425117.27577617.25546117.34707317.48028117.53433117.61765117.68056717.7148778.7834598.7754248.75468.7346818.6837298.6555858.6150428.5845818.5652278.6739688.6530248.6441748.6083448.587118.5644488.537528NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█239.732498241.693151NA242.817067241.684323247.616443NA252.578982256.579621259.105232NA267.595142274.122498277.509428NA287.02095289.842902291.479838NA290.453825291.463883291.316353NA295.377478297.462102298.594143NA146.437976146.499493146.718507NA144.5189144.010625143.075465NA143.584375144.741357144.988001NA144.31502144.196994143.985844NA140.559193140.54628NA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█238.602197239.55937NA241.898117241.684323246.309869NA251.075859255.219868257.822836NA265.607128271.747049274.759516NA284.66192286.722482287.4089NA287.736638288.803045289.210621NA292.589866293.958258295.031431NA145.484717145.21513144.918406NA143.69776143.240333142.534655NA143.027693143.722329143.502772NA142.68178142.27921141.860885NA139.50736139.124771NA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▁█0.2704750.271383NA0.4127751.6366610.177966NA0.0030541.0133321.799477NA0.4626310.0242310.156467NA0.8070130.8739370.002311NA1.8180324.3303167.86633NA3.7563691.8041571.184635NA3.8494242.9946290.594415NA3.220983.2703425.034165NA5.3326613.5136822.233907NA1.7168321.0785120.0NA1.5916420.285998NA
us-gaap:EarningsPerShareBasic ▅▇█▇▁▅▆▆▆▆▆▆▆▆▇▅▅▅▅▅▅▄▅▄▄▄▄▇▇▇▇▆▅▅▄▅▄▅▅▅▄▅▄▄▄▄0.360.470.580.48-0.010.360.390.440.420.40.410.420.40.40.460.320.310.340.310.320.30.280.30.270.250.260.240.50.530.470.480.390.360.320.280.290.280.320.28999999999999990.30.270.30.260.250.240.23
us-gaap:EarningsPerShareDiluted ▅▆█▇▁▅▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▄▅▄▄▄▄▇▇▇▇▆▅▅▄▄▄▅▄▅▄▄▄▄▄▄0.360.460.590.48-0.010.360.390.440.420.40.410.420.40.40.460.310.310.330.310.320.30.280.30.270.250.260.240.490.520.470.480.380.360.320.280.290.280.320.280.30.270.290.260.240.240.23
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 Operating Margin us-gaap:StatementBusinessSegments gntx:AutomotiveProductsSegmentNANANA464.673587222.067846439.855587NA464.280707456.625064455.798643442.803051449.184447444.245425454.965374450.39077428.161863433.92226445.652575411.526604419.793577414.403115393.968947395.862458379.889957370.5043360.615289342.414084341.786404329.557679326.364107320.306643280.924112279.789872262.9675NA261.910519274.820852285.6845NANANANANANANANA
 Operating Margin us-gaap:StatementBusinessSegments us-gaap:AllOtherSegmentsNANANA9.9649977.8577113.906139NA13.4807112.0862912.79035410.60566811.06898610.73601510.4547319.17969910.4659239.2168137.8826758.3863139.8496999.39766311.5988399.7301779.9391828.7541778.3221667.9968559.1275088.8792859.375237NA7.6975147.1840266.531469NA6.337575.4346965.022262NANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 TTM Greenblatt ROC _ _▅▇█▇▁▆▆▇▇▆▆▇▇▇▇▇▆▇▇▇▇▆▇▆▆▆▅▆▅▅▅▄▄▄▄▄▄▄▄▄▃▄▃99.924621133.733701162.414138.852889-6.738256105.027167110.901128.13568127.904966121.596331125.499127.427911126.683004128.515333133.994129.072652125.864514134.42712127.936134.212281128.745721120.84899126.662116.26262108.13283107.70850698.615103.20582799.83543897.17754695.63673.65624671.59627163.85363953.81957.62335557.51223265.50096355.78362.2467853.24689260.09087450.605116NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AllocatedShareBasedCompensationExpense █▁6.7275135.894645NA6.9047259.6413536.35607NA5.7121325.2000454.786794NA4.8294634.4656343.901316NA3.0670763.4063713.48424NA3.724783.81134.022382NA4.4042974.7289494.846051NA4.7786934.603699NANA3.7956263.544677NANA3.8112423.554026NANA3.2459752.822986NANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▅▆█▇▁▅▆▆▆▆▆▆▆▆▇▅▅▆▅▆▅▅▅▄▄▅▄▄▅▄▄▄▃▃▃▃▃▄▃▂▃▃▃▃▂88.816789108.554485145.743243118.8004180.15041791.00969899.020453110.636126109.73358105.605015106.796206109.692931106.331889112.911077131.65686793.05459490.97186999.5732887.9328795.09746384.90172679.51874889.02634669.43089772.89439274.67437368.15012868.95691574.76068166.07450769.75753956.83339349.93819150.80547839.05249344.8815534.20775155.47355445.28652126.3287935.96541247.31280541.0194442.92821623.884823NA
us-gaap:CostOfGoodsAndServicesSold ▆▇█▇▁▇▆▇▇▇▆▇▆▇▆▅276.408285300.424671313.18902286.401872185.980748297.174245282.031064297.440131292.17375298.944494281.365186287.263147282.176968292.791704279.280443267.398126NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GrossProfit ▅▇█▇▁▆▆▇▆▆▆▆▆▆▇▆▆▆▆▆▆▆▆▅▅▅▅▅▅▅▄▄▃▃▃▃▃▃▃▃▃▃▂▂▂▂151.596741183.300168216.675188.23671243.944808156.587481161.805180.321286176.537604169.644503172.044172.990286172.804472172.628401180.29171.22966167.207795175.800785169.167173.8219166.772559158.690788163.244151.8967145.543431143.092409134.673138.625692134.292228131.298807128.694105.962485102.61261993.46350389.11990.11606892.757306100.82649390.35495.28531785.62457190.31673779.46836373.75975573.89382668.568369
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▅▇█▇▁▆▆▇▇▆▇▇▆▇▇▇▆▇▆▇▆▆▆▆▆▆▅▅▆▅▅▅▄▄▄▄▄▄▄▄▄▄▃▃▃▃101.815719135.266736165.513309142.896998-3.872027107.274649113.644734131.579513130.282544124.908541130.779623130.534615128.972778131.759931138.155994130.832043127.943763134.864904129.054469134.327982127.60871119.569612128.675651116.047742110.450173108.41789104.01979103.992607105.622003101.69209104.13793881.04325477.12893965.75391258.47250161.68606160.67971568.78732358.72986564.49861657.74806863.45526255.24238750.1713150.34106547.685252
us-gaap:IncomeTaxExpenseBenefit ▄▅▅▅▁▄▃▄▅▅▅▄▄▅▂██▇█████▇▇▆▇▆▆▇▇▅▅▄▄▄▄▅▄▅▄▅▄▄▄▄15.30930121.81586622.17405825.804396-1.49799417.76884814.09768319.68166121.32391920.6281324.50506819.19879819.94879620.5111887.68709540.60170839.40781637.30816340.29307542.26333641.12346839.28961840.28009537.71531735.89173631.23444933.04491131.65572428.89525733.12601934.25691425.52229325.03154220.32334518.87386719.80897819.91317622.44273918.26375221.10155219.27589921.1223818.31912215.88006616.28373515.223122
us-gaap:InterestExpenseDebt NANANA0.20.3NANANANANA0.00.10.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▅▇█▇▁▅▆▆▆▆▆▆▆▆▇▅▅▆▅▆▅▅▅▅▅▅▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃86.506418113.45087143.339117.092602-2.37403389.50580199.547111.897852108.958625104.280411106.275111.335817109.023982111.248743130.46990.23033588.53594797.55674188.76192.06464686.48524280.27999488.39678.33242574.55843777.18344170.97572.33688376.72674668.56607169.88155.52096152.09739745.43056739.59941.87708340.76653946.34458440.46643.39706438.47216942.33288236.92326534.29124434.0573332.46213
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted ▅▇█▇▁▅▆▇▆▆85.185631111.790565141.287872115.400063-2.8133688.28896998.223501110.514244107.70723103.202291NANANA110.421438NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ▃▃▄▅▄▄▄▄▄▄▆▄▄▄▅▃▃▂▃▂▁▁▃▂▄▂▆▂▆▅█▇▆▃▅▅▄▄▄▄▅▄▅▄▃▄1.8910981.5330353.0990174.0441092.8662292.2474822.7441093.4438332.3775783.312215.2803243.1067042.2897743.2445984.1619281.7593912.0792490.4377841.1185260.115701-1.137011-1.2793782.013168-0.2148782.3173430.7093845.4044270.786785.7865654.5145448.5022817.3870085.5326681.9002734.6538194.0627063.1674833.286362.9464862.2518364.5011763.3643884.6372713.1990131.5543063.077355
us-gaap:OperatingExpenses ▇▇█▇▇▇▇█▇▇▆▆▆▆▆▅▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▂▄▃▄▄▃▃▃▂▂▂▁▁51.6721249.56646754.26022749.38382350.68306451.56031450.90394952.18560648.63263848.04817246.54423445.56237546.12146844.11306846.2959642.15700841.34328141.37366541.23105439.60961938.02683837.84179836.58102935.6340837.41060135.38390336.05760535.41986534.4567934.12126133.05863832.30623931.01634829.60986435.3000132.49271335.24507435.3255334.57033133.03853732.37767930.22586328.86324726.78745825.10706723.960472
us-gaap:OperatingIncomeLoss ▅▇█▇▁▆▆▇▇▆▆▇▇▇▇▇▆▇▇▇▇▆▇▆▆▆▅▆▅▅▅▄▄▄▄▄▄▄▄▄▃▄▃▃▃▃99.924621133.733701162.414138.852889-6.738256105.027167110.901128.13568127.904966121.596331125.499127.427911126.683004128.515333133.994129.072652125.864514134.42712127.936134.212281128.745721120.84899126.662116.26262108.13283107.70850698.615103.20582799.83543897.17754695.63673.65624671.59627163.85363953.81957.62335557.51223265.50096355.78362.2467853.24689260.09087450.60511646.97229748.78675944.607897
us-gaap:OtherComprehensiveIncomeLossNetOfTax █▁█▇█▇▅▄▆▇▆▄▃▇2.310371-4.8963852.4039921.7078162.524451.503897-0.526598-1.2617260.7749551.3246040.521653-1.642886-2.6920931.662333NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▃▃▄▄▄▂▃▃▃▃▄▃▂▄▃▂▃▂▂▂▁▁▂▂▄▃▃▃▇▆▅█▆▄▄▅▅▅▃▄▆▅▅▅▃▅0.9879590.5096251.8466532.2188521.404196-0.1991670.2700510.0903230.2371910.0494692.08036-0.073979-0.5543591.2069930.067593-0.3799960.343111-1.034743-1.187903-0.800855-1.911113-2.069419-1.116098-0.7103461.5632910.0973590.5173540.3802895.388564.1893863.3727786.9129244.9069511.404861.1628793.4761892.5337832.6903370.4226981.707843.9027212.8648183.4243622.5788530.9983022.564472
 us-gaap:ProfitLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedNetUnrealizedInvestmentGainLossNA0.351354NA0.3243540.7219320.029209NA0.2957520.103020.0699760.8139520.2054330.0002240.5653170.011937-0.1149050.5452060.1647180.4304860.094489-0.016076-0.3007710.2593811.3219821.2452341.6979761.1115671.5062384.2525063.2652242.4789264.2012413.2695811.834435NANANANANANANANANANANANA
us-gaap:ResearchAndDevelopmentExpense █▇█▇████▇▇▇▇▇▆▆▆▆▆▆▅▅▅▅▄▅▄▄▄▄▄▄▃▃▃▃▄▅▅▄▄▄▃▃▂▁▁29.05905827.65208129.51392627.8127328.99296829.61542228.8400629.39872528.35934328.08918126.9961426.88899927.20046526.04925824.56049224.77027925.2434125.15225724.4899223.58511523.07178823.09120922.98466321.50546122.31524421.58755121.78049721.6719420.23407420.48922719.84061119.10668218.86418218.68357618.56195320.43401222.79250323.21513421.80510320.66853720.24575718.91476118.07551116.4637615.22262214.338518
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▆▇█▇▂▆▆▇▇▇▆▇▆▇▇▆▆▆▆▆▆▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▁▁▁428.005026483.724839529.864474.639229.926453.762443.836477.761468.711468.589453.409460.253454.981465.42459.57438.627786443.139453.535419.913429.643276423.800778405.567786405.593389.829139379.258477368.937455350.411350.913912338.436964335.739344326.77288.621626286.973898269.498969260.349268.248089280.255548290.706762260.347269.467967243.001541250.945897222.100572206.832953201.56096185.768929
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax NANANA474.638584229.925556453.761726NA477.761417468.711354468.588997453.409460.253433454.98144465.420105459.57438.627786443.139453.535419.913429.643276423.800778405.567786405.593389.829139379.258477368.937455350.411350.913912338.436964335.739344326.77288.621626286.973898269.498969260.349268.248089280.255548290.706762260.347269.467967243.001541250.945897222.100572206.832953201.56096185.768929
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService gntx:AutomotiveProductsNANANA464.673587222.067846439.855587NA464.280707456.625064455.798643442.803051449.184447444.245425454.965374NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments gntx:AutomotiveMirrorsElectronics,gntx:AutomotiveSegmentNANANA427.426159210.60054401.085314NA418.746334413.429267408.971666398.068188399.732577396.547385404.241628NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments gntx:FireProtectionProducts,gntx:OtherSegmentNANANA6.3783034.837546.168751NA5.9772456.3592665.8522325.098835.9180855.813215.279658NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments gntx:HomeLinkModules,gntx:AutomotiveSegmentNANANA37.24742811.46730638.770273NA45.53437343.19579746.82697744.73486349.4518747.6980450.723746NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments gntx:WindowsProducts,gntx:OtherSegmentNANANA3.5866943.020177.737388NA7.5034655.7270246.9381225.5068385.1509014.9228055.175073NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical gntx:AutomotiveProducts,country:DENANANA56.51496923.86600972.785724NA74.04759673.15169278.44992773.94550981.62162385.64220591.793541NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical gntx:AutomotiveProducts,country:JPNANANA64.35326337.33394751.136933NA60.64197755.72229256.33369455.46806755.36364448.64708249.832997NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical gntx:AutomotiveProducts,country:MXNANANA33.34217113.58960145.950481NA43.88460942.17870544.410388NA28.41099822.35861723.09881NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical gntx:AutomotiveProducts,country:USNANANA156.5211155.849461135.581918NA145.798028144.547946141.383064149.233516151.229829142.896639140.312987NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical gntx:AutomotiveProducts,gntx:OtherCountriesNANANA153.94207491.428828134.400531NA139.908497141.024429135.22157164.155959160.969351167.059499173.025849NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical gntx:OtherProducts,country:USNANANA9.9649977.8577113.906139NA13.4807112.0862912.79035410.60566811.06898610.73601510.454731NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementBusinessSegments gntx:AutomotiveProductsSegmentNANANA464.673587222.067846439.855587NA464.280707456.625064455.798643442.803051449.184447444.245425454.965374450.39077428.161863433.92226445.652575411.526604419.793577414.403115393.968947395.862458379.889957370.5043360.615289342.414084341.786404329.557679326.364107320.306643280.924112279.789872262.9675NA261.910519274.820852285.6845NANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementBusinessSegments gntx:AutomotiveSegmentNANANA464.673587222.067846439.855587NA464.280707456.625064455.798643442.803051449.184447444.245425454.965374NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementBusinessSegments gntx:OtherSegmentNANANA9.9649977.8577113.906139NA13.4807112.0862912.79035410.60566811.06898610.73601510.454731NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementBusinessSegments us-gaap:AllOtherSegmentsNANANA9.9649977.8577113.906139NA13.4807112.0862912.79035410.60566811.06898610.73601510.4547319.17969910.4659239.2168137.8826758.3863139.8496999.39766311.5988399.7301779.9391828.7541778.3221667.9968559.1275088.8792859.375237NA7.6975147.1840266.531469NA6.337575.4346965.022262NANANANANANANANA
us-gaap:SellingGeneralAndAdministrativeExpense ▇▇█▇▇▇▇▇▆▆▆▅▅▅▇▅▄▄▄▄▃▃▃▃▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁22.61306221.91438624.74630121.57109321.69009621.94489222.06388922.78688120.27329519.95899119.54809418.67337618.92100318.0638121.73546817.38672916.09987116.22140816.74113416.02450414.9550514.75058913.59636614.12861915.09535713.79635214.27710813.74792514.22271613.63203413.21802713.19955712.15216610.92628811.73805712.05870112.45257112.11039612.76522812.3712.13192211.31110210.78773610.3236989.8844459.621954
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets ▇▇▇▇▇▇▇▇▇▇▇▆▇▇█████▇▇▇▇▇▇▇▆▆▆▅▅▅▃▃▂▂▂▂▂▂▂▁▁2166.7979312242.4455442197.941172192.4751062101.0415332158.1030922168.8031932167.2964042142.8028732100.3656282085.4340682069.3889262192.1092842254.3524682352.0539122371.6311942364.0937962363.2926662309.6198332258.2736722207.2592062197.3121212148.6729282124.0113712112.541032091.4351052022.5400291950.4323921890.0340791865.0529231764.0884341697.1281631366.2770151330.1322761265.6913351254.9043291254.0260271255.1472061176.0270021134.5434611114.0199081091.9129671002.690639NANANA
us-gaap:Liabilities ▂▃▁▃▂▄▁▂▁▂▁▁▂▃▃▄▅▅▆▆▆▇▇▇██▇▇▇█▇▇250.478942281.46483233.998042296.862807278.43412323.497459230.715373245.968141238.468638243.290881223.682408226.284671270.609972284.374972302.535651345.365995360.157373388.521128399.195599402.008282422.336028448.357032426.156167452.91577465.536324477.952649451.127584452.917321442.295766480.129842436.484751441.820726NANA144.730779NANANANANANANANANANANA
us-gaap:LiabilitiesAndStockholdersEquity ▇▇▇▇▇▇▇▇▇▇▇▆▇▇█████▇▇▇▇▇▇▇▆▆▆▅▅▅▃▃▂▂▂▂▂▂▂▁▁2166.7979312242.4455442197.941172192.4751062101.0415332158.1030922168.8031932167.2964042142.8028732100.3656282085.4340682069.3889262192.1092842254.3524682352.0539122371.6311942364.0937962363.2926662309.6198332258.2736722207.2592062197.3121212148.6729282124.0113712112.541032091.4351052022.5400291950.4323921890.0340791865.0529231764.0884341697.1281631366.2770151330.1322761265.6913351254.9043291254.0260271255.1472061176.0270021134.5434611114.0199081091.9129671002.690639NANANA
us-gaap:StockholdersEquity ▇▇▇▇▇▇▇▇▇▇▇▇▇█████▇▇▆▆▆▆▆▅▅▅▄▄▄▃▃▃▂▂▂▂▂▂▁▁▁1916.3189891960.9807141963.9431281895.6122991822.6074131834.6056331938.087821921.3282631904.3342351857.0747471861.751661843.1042551921.4993121969.9774962049.5182612026.2651992003.9364231974.7715381910.4242341856.265391784.9231781748.9550891722.5167611671.0956011647.0047061613.4824561571.4124451497.5150711447.7383131384.9230811327.6036831255.3074371207.009671162.4478281120.9605561092.6452471094.6900581070.2711721027.118521983.618617963.700994934.958451893.530826NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent ▅▆▆▆▄▅▅▆▅▅▄▄▅▇████▇▇▆▇▆▆▅▅▄▄▃▃▂▁▄▄▃▃▄▄▃▃▃▃▂924.5761761010.515547979.330564975.318566859.326688910.727496950.376892987.495404930.402907886.396011850.930254827.558593943.0773891141.6941881184.5638231203.8614951204.6985511194.5576731154.9890291108.816121055.6039011060.14553984.008792979.203221955.212123930.766861856.637694799.979786733.708178703.600975601.186242523.851649855.471597795.257475744.66304739.741466776.741088786.267964752.292984758.20257725.64465722.835545655.269274NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▄▅▅▄▃▂▃▂▂▁▁▁▃▆▇▇▇▇▇▇▆█▇▇▇▇▆▅▄▄▃▂▆▅▄▄▄▄▄▄▅▅▃▃▃▃353.032803455.940751423.371036400.499542343.811484278.524928296.321622260.151083260.332892221.688575217.025278194.017041296.699141524.32356569.734496561.999767580.579352559.645625546.477075534.518281499.493964626.47072551.557527564.528197569.896553549.911648497.429804433.486636391.650469374.688291309.591724226.676955502.721765442.552961389.678664381.101955375.707033370.804725357.986774397.105404444.619932440.321896348.349773303.717898295.234858340.853897
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▄▆▅▅▄▃▃▂▂▂▁▁▃▇█353.032803455.940751423.371036400.499542343.811484278.524928296.321622260.151083260.332892221.688575217.025278194.017041296.699141524.32356569.734496NANANA546.477075NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShortTermInvestments ▁▂▂▃▃▅▆█▇▇▇▆▇▆▆▇▇▇▇▆▆▁▁13.79882725.94411427.16436952.5784870.015164131.078039140.384053207.156287190.565065180.313222169.412999143.623541171.020806152.179408152.538054178.650929184.553242176.635803177.021197152.235753145.3355329.5952624.547355NANANA0.0NANANA0.00.092.51625275.95199160.80285621.52229945.94711651.98993660.80823759.14533824.11680341.64901486.447596NANANA
us-gaap:AccountsReceivableNetCurrent ▆██▇▄▆▆▇▆▆▅▇▆▇▆▆▆▇▅▆▆▆▅▅▅▅▄▄▄▄▃▃▂▂▂▂▂▃▂▂▂▂▁234.145996277.676643284.925335268.457875170.643014233.578125235.410326253.108715226.426332244.266296213.537799247.322101239.406379246.427239231.121788240.505816229.250339249.457918211.591745229.236789219.44295223.98947195.9694208.203616196.05968201.782059168.008704186.412048178.281171.337311143.04659152.437232120.187023121.927126109.579693126.272547129.948477139.296845110.389715130.03921111.859028116.3301995.647612NANANA
us-gaap:InventoryNet █▇▆▇█▇▇▇▆▆▆▆▆▆▆▆▅▅▅▄▄▅▄▄▃▃▃▂▂▂▂▂▂▂▄▄▅▅▅▃▂▁▁263.899976233.060307226.291843233.358102259.728189251.006414248.941855238.676795225.094463225.303042225.281599213.394037212.375655207.232952216.765583206.657817196.540222197.088251189.311437179.353603176.226597188.624776174.695411164.604063150.772495145.563949141.757884135.5979125.211874128.349467120.074164117.406559116.00197130.06969159.930266177.119455192.330005200.75116188.753312151.130845119.457528104.036266100.72873NANANA
us-gaap:InventoryFinishedGoods █▆▆▆▇▇█▇▇▇█▇█▆▇█▅▆▆▆▅▅▅▄▄▃▃▂▂▂▂▁▁▁▁▂▄▄▄▄▂49.51189242.65987241.81171342.89423245.4815947.38748250.89804748.143346.88110245.95829450.83644346.01797149.87955443.97026347.01226249.03185639.25691140.65687341.702540.09007735.74906136.57987636.93423333.45846531.95029330.080526.8416224.81046624.19747725.51794423.58237821.66217420.46829920.26271420.59100725.08608233.52698832.50032232.58912134.60363925.339347NA24.815693NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent █▂▂▂▂▂▄▃▃▁▃▄▃▁▁▂▁▁▄▁▂▁█▅▅▄▇▆▅▄▃▃▃▃▃▄▄▃▄▂▃59.69857417.89373217.57798120.42456715.12883716.5399929.31903628.40252427.98415514.82487625.67257929.20187323.57540811.53102914.40390216.04716613.77539611.73007630.58757513.47169415.10485811.46530257.23909941.86734538.48339533.50920549.44130244.48320238.56483529.22590628.47376427.33090324.04458724.75570724.67156133.7252132.80845723.42529834.35494620.78177325.591359NA24.095563NANANA
us-gaap:MachineryAndEquipmentGross NANA857.583647NANANA843.439691NANANA838.887032NANANA790.833278NANANA721.71325NANANA616.335223NANANA554.4252NANANA507.768233NANANA472.844579NANANA415.394183NANANA352.618391NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:PropertyPlantAndEquipmentGross NANA1257.206445NANANA1227.127361NANANA1197.953787NANANA1144.262514NANANA1047.053772NANANA933.980839NANANA842.271675NANANA772.441372NANANA716.092717NANANA603.929533NANANA486.549059NANANA
us-gaap:ConstructionInProgressGross NANA49.048555NANANA39.45649NANANA18.156423NANANA35.828403NANANA30.643709NANANA84.980367NANANA56.685789NANANA41.481572NANANA45.092001NANANA58.244561NANANA13.351954NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA789.07131NANANA728.811261NANANA699.480021NANANA651.783184NANANA581.231305NANANA521.260569NANANA468.880683NANANA415.420147NANANA366.154545NANANA321.387945NANANA281.441303NANANA
us-gaap:AmortizationOfIntangibleAssets ▁▁▁▁▁▁▁▁▁▁▁▁▁█5.65.65.65.65.65.65.65.65.65.65.65.65.65.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentNet ▇▇▇▇█████████████▇▇▇▆▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▂▂▁▁458.943776460.593013468.135135474.019432485.314868493.114501498.3161491.968638501.398382492.613112498.473766497.305597499.673418496.274467492.47933493.663599482.588291473.151849465.822467450.781365431.695399414.695494412.72027388.188954375.320843372.616211373.390992363.385115358.316077358.920465357.021225351.06663345.931734348.055549349.938172341.854037326.842448309.66366282.541588256.562323232.716169213.688533205.107756NANANA
us-gaap:LongTermInvestments █▇▇▇▇▇▆▅▅▆▆▆▆▁▃▃▃▃▃▃▄▃▄▄▅▅▅▅▅▅▅▅▆▇▆▆▆▆▆▅▆▆▆193.41857172.93441162.028068159.011362171.134695177.79476139.909323103.025468121.061221126.528508137.979082141.63151141.3056953.2457.78241851.66343549.26038161.51216249.89436357.45851473.45735871.06373295.15653994.424586114.740646115.4971114.642567104.108686109.797786108.967579107.005522114.270623136.977928158.211405141.834034145.087877137.556403146.155364128.168165106.915898142.684806142.324972129.091167NANANA
us-gaap:Goodwill ▂▃▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█311.922787314.681508311.922787311.216556309.033022307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.4307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845307.365845337.670463NANA0.0NANANANANANANANANANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:BusinessAcquisition,us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass gntx:AirCraftGlass,us-gaap:InProcessResearchAndDevelopment▅██▁1.251.3892371.3949951.011399NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:BusinessAcquisition,us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass gntx:AirCraftglass,us-gaap:InProcessResearchAndDevelopmentNANA1.394995NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:BusinessAcquisition,us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass gntx:GuardianOpticalTechnologies,us-gaap:InProcessResearchAndDevelopment▁█11.26042911.99444NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:BusinessAcquisition,us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass gntx:HomeLink,us-gaap:LicensingAgreementsNANA96.0NANANA96.0NANANA96.0NANANA96.096.096.096.096.096.096.096.096.096.096.096.096.096.096.096.096.087.0NANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▇▇▇▇▇▇▇▇▇▇▇██████▁▁▁▁▁▁▁▁▁▁▁251.213561256.911809249.748127247.911399251.725245.55250.375255.2260.025264.85269.675274.5279.325284.15288.975293.8298.625303.45308.275313.1317.925322.75327.575332.4337.225342.05346.875351.7356.525361.35366.175370.26879827.89575628.60784729.25608928.22094912.88608813.06021813.02426512.8626712.97428313.06391713.222442NANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:BusinessAcquisition,us-gaap:FiniteLivedIntangibleAssetsByMajorClass gntx:HomeLink,us-gaap:CustomerContractsNANA11.825NANANA16.125NANANA20.425NANANA24.72525.826.87527.9529.02530.131.17532.2533.32534.435.47536.5537.62538.739.77540.8541.92543.0NANANANANANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:BusinessAcquisition,us-gaap:FiniteLivedIntangibleAssetsByMajorClass gntx:HomeLink,us-gaap:DevelopedTechnologyRightsNANA71.25NANANA86.25NANANA101.25NANANA116.25120.0123.75127.5131.25135.0138.75142.5146.25150.0153.75157.5161.25165.0168.75172.5176.25166.0NANANANANANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:CustomerContracts▁▁▂▂▃▄▄▄▅▆▆▆▇▇█9.67510.7511.82512.913.97515.0516.12517.218.27519.3520.42521.522.57523.6524.725NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:DevelopedTechnologyRights▁▂▂▂▃▄▄▄▅▆▆▆▇██63.7567.571.2575.078.7582.586.2590.093.7597.5101.25105.0108.75112.5116.25NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:Patents▁▁▂▂▂▂▃▃▃▃▄▄▄▅▄▄▅▅▅▅▅▆▇▆▇▇█13.45737813.78930514.09643914.02909514.26858714.49358314.83795315.06547815.30433815.31184915.72326615.81594316.23340416.59163715.90347516.18224316.46595416.47246716.5207416.51140717.04417.46450217.98346317.62794818.13262718.6499419.066963NANANANANANANANANANANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:TechnologyBasedIntangibleAssets█▄▅▄▁0.2756180.2613630.2621290.2579410.247756NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent █▇▇▇▇▇▇▇▇▇▇▇▇▆▇▇▇▇▇▇▇▇▇▇████████▁▂▂▂▁▁▁▁▁▁▁783.277979771.336984750.475471743.137108756.399977754.261095720.110201687.832362711.001584721.356505736.030048744.524736749.358477616.383813675.010759674.1061676.806954695.583144688.808337698.676187719.959906722.471097751.943866756.619196782.008064788.052033792.511343787.067491798.009824802.531483805.880967822.209884164.873684186.819252171.090123173.308826150.442491159.215582141.19243119.778568155.659089155.388889142.313609NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccountsPayableCurrent ▇█▆▆▄▇▇▇▆▆▇▆█▅▆▅▆▅▅▅▆▅▄▆▄▅▅▄▃▄▃▃▂▁▂▃▃▅▄▅▄▄▂101.262288107.06193684.78442390.24679160.183429100.09919197.55391795.30979790.04108790.11749692.81031690.041982106.78444777.30789789.89846779.90353482.92092977.7142879.9636371.00081981.82315779.4191866.35377483.89225869.936273.2846671.45698368.61340855.82067564.39967956.51032150.33938943.7896333.00192243.20000252.23432353.51492772.98604765.47057370.15759763.28299261.07309240.295464NANANA
us-gaap:AccruedIncomeTaxesCurrent NANA3.790219NANANA0.024952NANANA4.293608NANANA0.360014NANANA0.572834NANANA0.148251NANANA0.768142NANANA13.316102NANANA1.58257NANANA0.0NANANANANANANA
us-gaap:AccruedLiabilitiesCurrent ▄▅▄▅▃▃▃▃▃▄▃▃▃▄▃███▃▃▃▅▂▄▃▃▂▃▃▄▂▃▂▃▂▂▂▂▁▂▁▂▁95.134329116.16805792.952434121.24237982.44766888.85871374.29288386.99433487.5197194.37637676.35060382.84450884.525227100.86170975.74854185.019306188.219588196.64158469.89434985.47844487.260676115.90402464.65277297.73762885.37251790.41774761.9741874.49977172.992648102.72134563.47009370.25104260.09408176.6533944.7574452.02325852.49735657.11855235.22392746.59048640.51852354.26554831.793165NANANA
us-gaap:DividendsPayableCurrent NANA29.243144NANANA28.896914NANANA28.526147NANANA28.028132NANANA25.896376NANANA24.759481NANANA23.619837NANANA20.380923NANANA18.599926NANANA17.288348NANANA15.652134NANANA
us-gaap:LiabilitiesCurrent ▅▆▅▇▆█▄▅▅▅▄▄▆▆▇███▄▄▄▅▃▅▄▄▃▃▃▄▃▃▂▂▂▂▂▃▂▃▂▂▁196.396617223.229993177.736857236.48917217.631097263.957904171.8468182.304131177.560797184.493872169.160919172.88649214.434674228.169606243.647007264.92284271.140517274.355864149.857979156.479263169.083833195.323204131.006546181.629886155.308717163.702407133.431163143.113179128.813323167.121024119.980414120.590431103.883711109.65531287.957442104.257581106.012283130.104599100.6945116.748083103.801515115.3386472.088629NANANA
us-gaap:LongTermDebtCurrent NANANA25.075.075.00.0NANANA0.00.023.12550.078.0NANANA7.5NANANA7.5NANANA7.5NANANA7.5NANANA0.0NANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityCurrent ▁█1.3844441.524418NA1.41906NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent NANA20.30486NANANA11.613355NANANA11.496734NANANA14.197321NANANA11.614716NANANA12.547418NANANA9.050471NANANA5.127751NANANA7.497144NANANA4.631064NANANA5.428081NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:LongTermDebt us-gaap:LongtermDebtType us-gaap:RevolvingCreditFacilityNANANA25.0NANA0.0NANANA0.00.00.00.00.00.00.020.860.775.785.885.8100.8100.8125.0125.0125.0NANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▁▃▂▄▆▆▆█▇35.41388140.17496338.96074345.30193650.49616850.44804651.45414956.71130754.717622NA54.521489NANANA75.709731NANANA71.212619NANANA47.272462NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ██▇▇▅▄▄▄▃▃▁18.66844418.05987417.30044215.07170110.3068559.0915097.4144246.9527036.1902195.5093730.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁█0.8999671.151001NA1.430423NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo ▁▁█▅0.4305330.4298711.0860840.825645NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ▁▁█▅0.0380750.0374950.4475830.268705NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▁▁█▇0.0063690.0058340.0392460.032956NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ▇▇▇▇▇▇▇▇▇▇▇▇▇█████▇▇▆▆▆▆▆▅▅▅▄▄▄▃▃▃▂▂▂▂▂▂▁▁▁1916.3189891960.9807141963.9431281895.6122991822.6074131834.6056331938.087821921.3282631904.3342351857.0747471861.751661843.1042551921.4993121969.9774962049.5182612026.2651992003.9364231974.7715381910.4242341856.265391784.9231781748.9550891722.5167611671.0956011647.0047061613.4824561571.4124451497.5150711447.7383131384.9230811327.6036831255.3074371207.009671162.4478281120.9605561092.6452471094.6900581070.2711721027.118521983.618617963.700994934.958451893.530826NANANA
us-gaap:CommonStockValue ▅▆▆▆▆▆▆▆▆▆▆▆▇▇▇▇███████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁14.33799514.49232914.62157214.70370314.74652914.69193915.07665115.1788615.28674715.3350615.55971715.7270316.13538716.43126316.81687917.03879117.17251717.26654517.26425117.27577617.25546117.34707317.48028117.53433117.61765117.68056717.7148778.7834598.7754248.75468.7346818.6837298.6555858.6150428.5845818.5652278.6739688.6530248.6441748.6083448.587118.5644488.537528NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ████▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆▅▅▅▄▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁859.678392859.355232852.771508830.408683818.67888801.388454807.928139799.462368777.238253748.641461745.324144743.495999748.794815742.491728723.510672713.624374706.680885701.980783683.446463655.29047638.336658607.279154596.782695584.423871575.679415567.470322553.836483515.108023501.953007490.518149478.865778455.9971444.299603429.519108418.76601410.922622410.631715401.647926395.229891379.76399368.979703359.051014347.834218NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▆▆▆▆▅▅▆▆▆▆▆▆▇▇████▇▇▆▆▆▆▆▅▅▅▅▄▄▃▃▃▂▂▂▂▂▂▁▁▁1038.0375641085.1784861089.6989961046.052853986.442761018.3104461116.3721331107.449541111.3100141093.373961102.4681371086.0032161157.0482141208.8415161301.9973271289.5966191276.9018651254.7789761210.9848251184.1419241132.8066571126.2209441109.3846211070.8990251046.5677381019.52762988.54807959.485823919.492148866.166533818.027861768.52776733.268066701.368056676.039254655.040546660.27199638.299049610.702253587.524488561.344112540.046163514.842177NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▃▂▃▃▂▂▁▂▂▂▁▁▂▂▃▃▃▂▂▂▁▁▂▁▃▄▄▅▆▆▇▇▇▇▆▆▅▇▅▄▇█▇4.2650381.9546676.8510524.447062.7392440.214794-1.289103-0.7625050.499221-0.275734-1.600338-2.12199-0.4791042.2129897.1933836.0054153.1811560.745234-1.271305-0.44278-3.475598-1.892082-1.130836-1.7616267.1399028.80394711.31301514.13776617.51773419.48379921.97536322.09884820.78641622.94562217.57071118.11685215.11238521.67117312.5422037.72179524.79006927.29682622.316903NANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues ▁▂▄▂▂▂▂▆▇▂▁▂▄█4.3910449.2658418.1264597.9664898.3552047.3554889.59927626.28706131.4202610.5145545.4581548.38307316.72954636.267047NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▃▃█▄▂▃▃▃▂▂▂▂▂▁6.7275135.89464511.7041317.3065435.4305836.356075.7437585.7882865.2762014.8629474.7474164.9056264.6754683.977471NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃█▆▆▂▇▅▅▆▆▇▅▆▆▆▄▆▆▅▅▅▇▃▄▄▅▅▄▂▄▄▃▄▄▄▄▂▃▁▂▂▄▂▂▁▃61.393168190.849001135.447521138.59206639.171714151.28047122.026566110.473004139.627076133.840218154.211358105.822734144.935506147.449048148.44668688.998375132.366548131.191171118.43999399.553675102.029962151.44116468.41684591.27385983.935875107.95184699.76927685.34824744.3836497.72194693.67287751.38040774.86301297.42253481.39661174.92052640.39739661.13152116.23672720.81690827.23948777.37554336.02498225.0028965.79779461.308014
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▇▇██▇█▇▇▇▇█▅██▇▇▇▇▇▆▇▇▇▇▇▇▇▇▇▇▁▇▇▇▇▇▇▇▇▇█▇▇▇▇-23.786422-40.6092541.70486721.28327347.144471-43.7161742.344528-11.017646-33.139864-14.8981-38.0001858.362459-185.65694729.4734792.847861-23.278169-20.780171-36.502091-51.125495-24.203699-174.703278-1.413636-36.930124-18.999108-18.677488-15.130941-34.188643-17.055611-11.169562-17.299667-6.638811-588.550411-5.185589-32.881808-58.227387-18.047886-21.989327-33.809644-51.628103-58.959894-13.79941420.860421-13.721434-7.554762-44.379971-58.930326
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▃▃▃▄▂▃▃▃▃▃▁▂▁▂▃▃▃▃▄▃▃▄▃▄▄▄▄▄▄▄█▄▄▄▃▄▄▄▄▄▄▅▄▄▄-140.514694-117.670032-114.280894-103.187281-21.029629-125.36099-88.200555-99.637167-67.842895-114.278821-93.202936-216.867293-186.902978-222.333463-143.559818-84.299791-90.65265-81.52053-55.355704-40.325659-54.30344-75.114335-44.457391-77.643107-45.273482-40.339061-1.637465-26.456469-16.2519-15.325712-4.119297261.125194-9.508619-11.666429-14.592515-51.477718-13.505761-14.503926-3.727254-9.371542-9.142037-6.26384122.328327-8.965094-7.0368622.367763
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▄▇▇██▆▇▆▇▇▇▄▁▅-102.90794832.56971522.87149456.68805865.286556-17.79669436.170539-0.18180938.6443174.66329723.008237-102.6821-227.624419-45.410936NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DeferredIncomeTaxExpenseBenefit ▄▄▃▃▄▄▃▅▅▄▅▄▄▄▁▄▅▅▇▅▅▄█▃▄▄▇▄▅▄▄▄▄▄▄▅▄▄▆▄▅▅▅▅▄▄-2.002361-1.544501-5.859729-7.383531-0.586607-1.589855-5.5483551.9936851.429986-1.2338531.123309-2.7945110.00326-2.746797-21.851686-0.1528571.2900015.71836320.2943312.6061842.001664-2.40381823.895316-8.364234-2.45727-0.01535414.592048-0.4418912.28212-1.614318-1.455418-3.24693-0.844024-2.180428-2.079521.1935860.8491070.88031110.914713-4.3001245.3244342.0036516.2262433.8632080.461572-0.160137
us-gaap:DepreciationDepletionAndAmortization ▇▇▇▇█▇▇▇▇█▆▇██▇▇▇▇▅▆▆▆▄▅▅▅▄▅▅▅▅▃▃▃▂▂▂▂▁▂▂▂▁▁▁▁25.89853425.59913126.25087425.05132827.14255226.29514625.37146126.03512525.19758428.09880421.43854224.83959327.86224528.04643424.71235724.43023125.24646625.18185419.73366923.06397422.95075722.8390316.89007221.23786821.19212221.27910517.62867520.15508519.76714319.82540220.51917814.76834513.76068313.80594912.55931112.48158112.46421912.6747129.32443612.02696910.73090910.552379.02960110.0379779.8775059.675591
us-gaap:IncreaseDecreaseInAccountsPayable ▄▇▄█▁▅▅▆▅▅▅▃█▄▆▅▆▅▆▄▅▆▃▆▅▅▅▆▄▆▆▆▆▄▄▅▃▆▅▆▅▇▁▆▄▇-5.79964822.277513-5.46445630.063362-39.9982182.5452742.244125.26871-0.076409-2.692822.768335-16.74246529.476549-12.590579.994933-3.0173955.206649-2.249358.962811-10.8223382.40397713.065406-17.53848413.956058-3.348461.8276772.84357512.792733-8.5790047.8893586.1709326.54975910.787708-10.19808-9.034321-1.280604-19.471127.515474-4.6870246.8746052.209920.777628-35.4876695.842085-5.49469322.30156
us-gaap:IncreaseDecreaseInAccountsReceivable ▂▃▄█▁▄▃▅▃▅▂▄▃▄▃▄▃▅▃▄▄▅▃▄▃▅▃▄▄▅▃▅▄▄▃▄▃▅▃▅▄▅▁▄▄▄-43.530647-7.25369216.4574697.814861-63.149663-1.832201-17.69838926.682383-17.83996430.728497-33.7843047.915723-7.02085915.305451-9.38402811.255477-20.20757937.866173-17.6450449.793839-4.5465228.02007-12.23421612.143936-5.72237933.773355-18.4033448.1310486.94368928.290721-9.40778721.147907-1.74010312.347433-16.692854-3.67593-9.34836828.90713-19.64949518.180182-4.47116220.682578-60.0104713.2280219.6269512.667399
us-gaap:IncreaseDecreaseInInventories █▆▅▄▆▆▆▇▆▆▇▆▆▅▆▆▆▆▆▆▅▇▆▇▆▆▆▆▆▆▆▆▅▄▅▅▅▇██▇▆▁▇▇▇30.8396696.768464-7.066259-26.3700878.645992.06455810.2650613.582332-0.2085790.02144311.8875621.0183845.142701-9.53263110.10776610.117595-0.5480297.7768149.9578343.127006-12.39817913.92936510.09134813.8315675.2085453.8060656.15998410.386027-3.1375938.2753032.6676051.404589-14.06772-29.860576-17.189189-15.21055-8.42115511.99784837.62246731.67331715.4212623.307536-85.61710512.82565411.53434914.137368
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃█▆▆▂▇▅▅▆▆▇▅▆▆▆▄▆▆▅▅▅▇▃▄▄▅▅▄▂▄▄▃▄▄▄▄▂▃▁▂▂▄▂▂▁▃61.393168190.849001135.447521138.59206639.171714151.28047122.026566110.473004139.627076133.840218154.211358105.822734144.935506147.449048148.44668688.998375132.366548131.191171118.43999399.553675102.029962151.44116468.41684591.27385983.935875107.95184699.76927685.34824744.3836497.72194693.67287751.38040774.86301297.42253481.39661174.92052640.39739661.13152116.23672720.81690827.23948777.37554336.02498225.0028965.79779461.308014
us-gaap:NetIncomeLoss ▅▇█▇▁▅▆▆▆▆▆▆▆▆▇▅▅▆▅▆▅▅▅▅▅▅▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃86.506418113.45087143.339117.092602-2.37403389.50580199.547111.897852108.958625104.280411106.275111.335817109.023982111.248743130.46990.23033588.53594797.55674188.76192.06464686.48524280.27999488.39678.33242574.55843777.18344170.97572.33688376.72674668.56607169.88155.52096152.09739745.43056739.59941.87708340.76653946.34458440.46643.39706438.47216942.33288236.92326534.29124434.0573332.46213
 us-gaap:ProfitLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedNetUnrealizedInvestmentGainLossNA0.351354NA0.3243540.7219320.029209NA0.2957520.103020.0699760.8139520.2054330.0002240.5653170.011937-0.1149050.5452060.1647180.4304860.094489-0.016076-0.3007710.2593811.3219821.2452341.6979761.1115671.5062384.2525063.2652242.4789264.2012413.2695811.834435NANANANANANANANANANANANA
us-gaap:ShareBasedCompensation ▅▄▆▆█▅▄▄▄▃▃▃▃▃▄▃▃▃▃▃▃▄▃▄▄▄▄▄▄▃▃▃▃▂▃▃▃▃▃▂▂▂▂▁▁▁6.7275135.8946457.5304217.3065449.6042926.356075.7437585.7882865.2762014.8629474.7474244.9056184.6754683.9774715.2861613.9760964.6917124.4229964.6893924.725884.8029744.9744534.8963845.3100695.4105875.8139515.7069925.4227375.4051824.742084.8989694.4503094.2278923.8500634.0718444.3702884.0311263.9605794.0128383.7651443.3180513.1015242.9822062.7997782.535812.334402
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▇▇██▇█▇▇▇▇█▅██▇▇▇▇▇▆▇▇▇▇▇▇▇▇▇▇▁▇▇▇▇▇▇▇▇▇█▇▇▇▇-23.786422-40.6092541.70486721.28327347.144471-43.7161742.344528-11.017646-33.139864-14.8981-38.0001858.362459-185.65694729.4734792.847861-23.278169-20.780171-36.502091-51.125495-24.203699-174.703278-1.413636-36.930124-18.999108-18.677488-15.130941-34.188643-17.055611-11.169562-17.299667-6.638811-588.550411-5.185589-32.881808-58.227387-18.047886-21.989327-33.809644-51.628103-58.959894-13.79941420.860421-13.721434-7.554762-44.379971-58.930326
us-gaap:PaymentsToAcquireProductiveAssets ▃▂▂▁▂▃▅▂▆▃▃▃▅▅▃▆▆▅▆▇▇▄▇▆▃▃▄▄▂▃▃▂▂▂▄▅▆█▇▇▆▃▃18.75305512.59938814.6584688.22000713.25362315.57444326.25778312.81780528.66036616.84430117.21937716.91074525.61255826.2478917.92908329.89296629.09887727.11999329.45838536.66469734.50349720.32903535.65893528.69299418.42947815.16035522.52463519.7463513.83011216.4178917.35368813.95975711.39204212.6749719.87716628.17290329.59952239.82485835.18281135.99945329.55906919.43639717.770593NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▃▃▃▄▂▃▃▃▃▃▁▂▁▂▃▃▃▃▄▃▃▄▃▄▄▄▄▄▄▄█▄▄▄▃▄▄▄▄▄▄▅▄▄▄-140.514694-117.670032-114.280894-103.187281-21.029629-125.36099-88.200555-99.637167-67.842895-114.278821-93.202936-216.867293-186.902978-222.333463-143.559818-84.299791-90.65265-81.52053-55.355704-40.325659-54.30344-75.114335-44.457391-77.643107-45.273482-40.339061-1.637465-26.456469-16.2519-15.325712-4.119297261.125194-9.508619-11.666429-14.592515-51.477718-13.505761-14.503926-3.727254-9.371542-9.142037-6.26384122.328327-8.965094-7.0368622.367763
us-gaap:ProceedsFromIssuanceOfLongTermDebt NANA0.00.00.075.0NANA0.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RepaymentsOfLongTermDebt NANA25.0NANANA0.00.00.00.00.023.12526.87528.029.59.37526.87541.87516.875NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:LongtermDebtType us-gaap:RevolvingCreditFacilityNANA25.050.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividendsCommonStock ▇████▇███▇▇██▇▇▇▆▆▆▆▅▅▆▆▅▅▅▅▃▃▃▃▃▃▃▃▃▂▂▂▂▁▁▁▁▁28.9846629.24310829.40729329.49290829.38483328.89689429.09181429.29922529.39201228.52614628.83286329.58166330.12398128.02813228.39798328.62086325.89981725.89637725.91366425.88319124.5750224.75948124.84030224.95621123.57408923.61983723.42255623.40113120.42739920.38092320.26231620.19633820.10176518.59992618.55799318.79359818.74778817.28834817.21668817.17422117.12889615.65213415.43951715.39549115.34189215.217332
us-gaap:Dividends NANANA29.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Dividends us-gaap:SubsequentEventType us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▅▄▄▂▁▇▃▄▃▄▃▇▆█▅▃▂▂▂▂▃▃▂▂▂▂▂▁▁▁▁115.92107997.69276378.0000631.6608620.0178.81958468.70801796.62500369.87114396.26722969.828227172.543703146.633543202.572378101.5355556.2707842.57050130.98638540.61959830.46675247.68920344.58566828.32837132.79325825.05805125.04914520.0109259.9999570.00.00.0NANA0.00.0NANA0.0NANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1414141414141515151515151616161717171717171717171717178.7834598.7754248.75468.7346818.6837298.6555858.6150428.5845818.5652278.6739688.6530248.6441748.6083448.587118.5644488.5375288.300363
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.60.70.70.70.70.70.70.70.70.70.80.70.70.70.70.70.70.70.80.80.80.80.80.80.80.90.50.50.50.50.50.60.60.70.70.70.70.70.80.80.80.91.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value239241242241247252256259267274277287289291290291291295297298146146146144144143143144144144144143140140
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value238239241241246251255257265271274284286287287288289292293295145145144143143142143143143142142141139139
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value270480.0271380.0412780.01636700.0177970.03054.01013300.01799500.0462630.024231.0156470.0807010.0873940.02311.01818000.04330300.07866300.03756400.01804200.01184600.03849400.02994600.0594420.03221000.03270300.05034200.05332700.03513700.02233900.01716800.01078500.001591600.0286000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.360.470.580.48-0.010.360.390.440.420.40.410.420.40.40.460.320.310.340.310.320.30.280.30.270.250.260.240.50.530.470.480.390.360.320.280.290.280.320.290.30.270.30.260.250.240.23
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.360.460.590.48-0.010.360.390.440.420.40.410.420.40.40.460.310.310.330.310.320.30.280.30.270.250.260.240.490.520.470.480.380.360.320.280.290.280.320.280.30.270.290.260.240.240.23
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

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302013-09-302013-06-302012-09-302012-06-302011-09-302011-06-30
Value6.7275135.8946456.9047259.6413536.356075.7121325.2000454.7867944.8294634.4656343.9013163.0670763.4063713.484243.724783.81134.0223824.4042974.7289494.8460514.7786934.6036993.7956263.5446773.8112423.5540263.2459752.822986
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.61.21.54.21.41.21.11.01.01.00.80.70.80.80.90.91.01.11.21.31.41.41.31.21.41.31.21.2

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value881081451180.1504179199110109105106109106112131939099879584798969727468687466695649503944345545263547414223
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.822.427.525.00.120.122.323.223.422.523.623.823.424.328.621.220.522.020.922.120.019.621.917.819.220.219.419.722.119.721.319.717.418.915.016.712.219.117.49.814.818.918.520.811.8

us-gaap:ComprehensiveIncomeNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Comprehensive
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-4.043973-0.1158512.3878232.1959870.3613761.2506411.025605-5.814797-0.481443-0.238779-0.0168110.3210851.4866170.6190371.410665-0.2567962.1748260.248615-0.207577-0.04599-7.675667-1.941263-0.375495-1.363653-3.110576-1.724576-2.400314-0.2720111.039335-2.3883215.97666-1.0396762.728819-5.7737968.784185
Percentage of ComprehensiveIncomeNetOfTax-3.7-0.11587.52.40.31.11.0-5.4-0.4-0.2-0.00.21.60.71.4-0.32.30.3-0.3-0.1-11.1-2.7-0.5-2.0-4.5-2.3-3.6-0.41.8-4.811.8-2.76.1-16.915.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.8-0.01.00.50.10.30.2-1.3-0.1-0.1-0.00.10.30.10.3-0.10.50.1-0.1-0.0-2.0-0.5-0.1-0.4-0.9-0.5-0.7-0.10.4-0.82.2-0.41.0-2.13.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Comprehensive
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-0.8524121.8236670.136627-0.69209-1.623102-0.4756860.298999-0.306279-1.174213-2.4656031.6261780.6420771.1821521.495210.18859-1.5514540.162343-1.7538230.324844-0.409916-0.3966850.300767-0.942974-0.501892-0.269392-0.241489-0.091250.1485260.2730970.229115-0.6017490.4935350.275648-0.7849920.344785
Percentage of ComprehensiveIncomeNetOfTax-0.81.590.8-0.8-1.5-0.40.3-0.3-1.1-2.31.40.51.31.60.2-1.80.2-2.10.4-0.5-0.60.4-1.3-0.7-0.4-0.3-0.10.20.50.5-1.21.30.6-2.30.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.20.40.1-0.2-0.3-0.10.1-0.1-0.3-0.50.30.10.30.30.0-0.40.0-0.40.1-0.1-0.10.1-0.3-0.1-0.1-0.1-0.00.00.10.1-0.20.20.1-0.30.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value276300313286185297282297292298281287282292279267
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax64.662.159.160.380.965.563.562.362.363.862.162.462.062.960.861.0

Gross Profit

us-gaap:GrossProfit

us-gaap:GrossProfit


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value15118321618843156161180176169172172172172180171167175169173166158163151145143134138134131128105102938990921009095859079737368
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.437.940.939.719.134.536.537.737.736.237.937.638.037.139.239.037.738.840.340.539.439.140.239.038.438.838.439.539.739.139.436.735.834.734.233.633.134.734.735.435.236.035.835.736.736.9

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value101135165142-3.872027107113131130124130130128131138130127134129134127119128116110108104103105101104817765586160685864576355505047
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.828.031.230.1-1.723.625.627.527.826.728.828.428.328.330.129.828.929.730.731.330.129.531.729.829.129.429.729.631.230.331.928.126.924.422.523.021.723.722.623.923.825.324.924.325.025.7

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value15212225-1.4979941714192120241919207.68709540393740424139403735313331283334252520181919221821192118151615
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 RevenueFromContractWithCustomerExcludingAssessedTax3.64.54.25.4-0.73.93.24.14.54.45.44.24.44.41.79.38.98.29.69.89.79.79.99.79.58.59.49.08.59.910.58.88.77.57.27.47.17.77.07.87.98.48.27.78.18.2

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.0699030.0933980.1548270.0862210.1919060.007765-0.0229050.0786180.0273850.01860.2163660.054609-6e-050.1502740.006427-0.0618720.2935720.0886950.2318010.050878-0.008657-0.1619530.1396660.7118370.6705090.9142950.5985360.8110512.2898121.7581971.3348072.2622061.7605430.987772
Percentage of IncomeTaxExpenseBenefit0.50.40.70.3-12.80.0-0.20.40.10.10.90.3-0.00.70.1-0.20.70.20.60.1-0.0-0.40.31.91.92.91.82.67.95.33.98.97.04.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.10.0-0.00.00.00.00.00.0-0.00.00.0-0.00.10.00.10.0-0.0-0.00.00.20.20.20.20.20.70.50.40.80.60.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense Debt

us-gaap:InterestExpenseDebt

us-gaap:InterestExpenseDebt


Interest
Period End2020-09-302020-06-302018-12-312018-09-302018-06-30
Value200000.0300000.00100000.0300000.0
Percentage of InterestExpenseDebt100.0100.00.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.10.00.00.1

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value86113143117-2.374033899911110810410611110911113090889788928680887874777072766869555245394140464043384236343432
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 RevenueFromContractWithCustomerExcludingAssessedTax20.223.527.124.7-1.019.722.423.423.222.323.424.224.023.928.420.620.021.521.121.420.419.821.820.119.720.920.320.622.720.421.419.218.216.915.215.614.515.915.516.115.816.916.616.616.917.5

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value86113143117-2.3740338999111108104106111109111
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.223.527.124.7-1.019.722.423.423.222.323.424.224.023.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-03-31
Value85111141115-2.813368898110107103110
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.923.126.724.3-1.219.522.123.123.022.023.7

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.8910981.5330353.0990174.0441092.8662292.2474822.7441093.4438332.3775783.312215.2803243.1067042.2897743.2445984.1619281.7593912.0792490.4377841.1185260.115701-1.137011-1.2793782.013168-0.2148782.3173430.7093845.4044270.786785.7865654.5145448.5022817.3870085.5326681.9002734.6538194.0627063.1674833.286362.9464862.2518364.5011763.3643884.6372713.1990131.5543063.077355
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.30.60.91.20.50.60.70.50.71.20.70.50.70.90.40.50.10.30.0-0.3-0.30.5-0.10.60.21.50.21.71.32.62.61.90.71.81.51.11.11.10.81.91.32.11.50.81.7

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value51495449505150524848464546444642414141393837363537353635343433323129353235353433323028262523
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.110.210.210.422.011.411.510.910.410.310.39.910.19.510.19.69.39.19.89.29.09.39.09.19.99.610.310.110.210.210.111.210.811.013.612.112.612.213.312.313.312.013.013.012.512.9

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value99133162138-6.73825610511012812712112512712612813312912513412713412812012611610810798103999795737163535757655562536050464844
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 RevenueFromContractWithCustomerExcludingAssessedTax23.327.630.729.3-2.923.125.026.827.325.927.727.727.827.629.229.428.429.630.531.230.429.831.229.828.529.228.129.429.528.929.325.524.923.720.721.520.522.521.423.121.923.922.822.724.224.0

us-gaap:OperatingIncomeLoss us-gaap:StatementBusinessSegments

gntx:AutomotiveProductsSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value101134160138-6.0542351001081231241161221241231241311251231321251301251151221121051049610096939471696252565765
Percentage of OperatingIncomeLoss101.9100.799.099.789.896.098.296.397.296.297.597.697.797.298.097.597.998.698.297.397.596.096.996.597.397.397.896.997.096.298.896.997.798.198.397.599.4100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.827.830.429.2-2.622.224.525.826.525.027.027.027.226.828.628.727.829.229.930.429.628.630.328.827.728.427.528.528.627.828.924.724.423.320.320.920.422.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProductsSegment24.228.30.029.8-2.722.90.026.627.225.70.027.727.927.50.029.428.429.70.031.130.329.40.029.528.429.10.029.329.428.60.025.425.023.80.021.520.822.9

us-gaap:AllOtherSegments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-1.865689-0.9343511.5843680.424261-0.6840214.2516231.9449754.7931423.6097434.6436313.0993523.0764122.9248093.5531742.6441293.2546582.6417031.9221632.3016043.645083.1739124.8683733.8844334.0236822.8903652.9004482.2004333.1522052.985473.7330782.279521.6366161.1922051.4295910.3728170.03026
Percentage of OperatingIncomeLoss-1.9-0.71.00.310.24.01.83.72.83.82.52.42.32.82.02.52.11.41.82.72.54.03.13.52.72.72.23.13.03.83.12.31.92.50.60.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.4-0.20.30.1-0.30.90.41.00.81.00.70.70.60.80.60.70.60.40.50.80.71.21.01.00.80.80.60.90.91.10.80.60.40.50.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AllOtherSegments-25.3-11.50.04.3-8.730.60.035.629.936.30.027.827.234.00.031.128.724.40.037.033.842.00.040.533.034.90.034.533.639.829.622.818.322.66.90.6

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2310400.0-4896400.02404000.01707800.02524400.01503900.0-526600.0-1261700.0774960.01324600.0521650.0-1642900.0-2692100.01662300.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.5-1.00.50.41.10.3-0.1-0.30.20.30.1-0.4-0.60.4

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302020-06-30
Value1347200.02387800.0
Percentage of OtherComprehensiveIncomeLossNetOfTax58.394.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.31.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2310400.0-4896400.02404000.01707800.02524400.01503900.0-526600.0-1261700.0774960.01324600.0521650.0-1642900.0-2692100.01662300.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.5-1.00.50.41.10.3-0.1-0.30.20.30.1-0.4-0.60.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302020-06-30
Value963200.0136630.0
Percentage of OtherComprehensiveIncomeLossNetOfTax41.75.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedTranslationAdjustment0.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.9879590.5096251.8466532.2188521.404196-0.1991670.2700510.0903230.2371910.0494692.08036-0.073979-0.5543591.2069930.067593-0.3799960.343111-1.034743-1.187903-0.800855-1.911113-2.069419-1.116098-0.7103461.5632910.0973590.5173540.3802895.388564.1893863.3727786.9129244.9069511.404861.1628793.4761892.5337832.6903370.4226981.707843.9027212.8648183.4243622.5788530.9983022.564472
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 RevenueFromContractWithCustomerExcludingAssessedTax0.20.10.30.50.6-0.00.10.00.10.00.5-0.0-0.10.30.0-0.10.1-0.2-0.3-0.2-0.5-0.5-0.3-0.20.40.00.10.11.61.21.02.41.70.50.41.30.90.90.20.61.61.11.51.20.51.4

Profit Loss

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

us-gaap:ProfitLoss

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Profit
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.3513540.3243540.7219320.0292090.2957520.103020.0699760.8139520.2054330.0002240.5653170.011937-0.1149050.5452060.1647180.4304860.094489-0.016076-0.3007710.2593811.3219821.2452341.6979761.1115671.5062384.2525063.2652242.4789264.2012413.2695811.834435
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.30.00.10.00.00.20.00.00.10.0-0.00.10.00.10.0-0.0-0.10.10.30.30.50.30.41.31.00.81.51.10.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


Research
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value29272927282928292828262627262424252524232323222122212121202019191818182022232120201818161514
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.85.75.65.912.66.56.56.26.16.06.05.86.05.65.35.65.75.55.85.55.45.75.75.55.95.96.26.26.06.16.16.66.66.97.17.68.18.08.47.78.37.58.18.07.67.7

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value428483529474229453443477468468453460454465459438443453419429423405405389379368350350338335326288286269260268280290260269243250222206201185
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:ProductOrService

gntx:AutomotiveProducts


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
Value420475521464222439433464456455442449444454
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.398.398.497.996.696.997.797.297.497.397.797.697.697.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.398.398.497.996.696.997.797.297.497.397.797.697.697.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

gntx:AutomotiveMirrorsElectronics, gntx:AutomotiveSegment


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
Value390435481427210401397418413408398399396404
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax91.190.090.990.191.688.489.587.688.287.387.886.987.286.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax91.190.090.990.191.688.489.587.688.287.387.886.987.286.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveMirrorsElectronics gntx:AutomotiveSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:FireProtectionProducts, gntx:OtherSegment


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6.3196625.8041586.3783034.837546.1687515.5515175.9772456.3592665.8522325.098835.9180855.813215.279658
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.51.21.32.11.41.31.31.41.21.11.31.31.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.51.21.32.11.41.31.31.41.21.11.31.31.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:FireProtectionProducts gntx:OtherSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:HomeLinkModules, gntx:AutomotiveSegment


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
Value3040403711383645434644494750
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.18.37.67.85.08.58.29.59.210.09.910.710.510.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.18.37.67.85.08.58.29.59.210.09.910.710.510.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:HomeLinkModules gntx:AutomotiveSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:WindowsProducts, gntx:OtherSegment


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.0627112.3032453.5866943.020177.7373884.4516477.5034655.7270246.9381225.5068385.1509014.9228055.175073
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.50.81.31.71.01.61.21.51.21.11.11.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.50.81.31.71.01.61.21.51.21.11.11.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:WindowsProducts gntx:OtherSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementGeographical

gntx:AutomotiveProducts, country:DE


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
Value5869755623727074737873818591
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.814.414.211.910.416.015.915.515.616.716.317.718.819.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.814.414.211.910.416.015.915.515.616.716.317.718.819.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts country:DE100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:AutomotiveProducts, country:JP


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
Value5453636437515260555655554849
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.711.111.913.616.211.311.912.711.912.012.212.010.710.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.711.111.913.616.211.311.912.711.912.012.212.010.710.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts country:JP100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:AutomotiveProducts, country:MX


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
Value2831343313453043424432282223
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.76.66.57.05.910.16.99.29.09.57.16.24.95.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.76.66.57.05.910.16.99.29.09.57.16.24.95.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts country:MX100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:AutomotiveProducts, country:US


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
Value13514617115655135138145144141149151142140
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.730.332.333.024.329.931.130.530.830.232.932.931.430.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.730.332.333.024.329.931.130.530.830.232.932.931.430.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:AutomotiveProducts, gntx:OtherCountries


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
Value1431741771539113414113914113558160167173
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.436.033.432.439.829.631.929.330.128.912.835.036.737.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.436.033.432.439.829.631.929.330.128.912.835.036.737.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts gntx:OtherCountries100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:OtherProducts, country:US


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
Value7.3823738.1074038.2624169.9649977.85771131013121210111010
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.71.62.13.43.12.32.82.62.72.32.42.42.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.71.62.13.43.12.32.82.62.72.32.42.42.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:OtherProducts country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

gntx:AutomotiveProductsSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value420475521464222439433464456455442449444454450428433445411419414393395379370360342341329326320280279262261274285
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.398.398.497.996.696.997.797.297.497.397.797.697.697.898.097.697.998.398.097.797.897.197.697.597.797.797.797.497.497.298.097.397.597.697.698.198.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.398.398.497.996.696.997.797.297.497.397.797.697.697.898.097.697.998.398.097.797.897.197.697.597.797.797.797.497.497.298.097.397.597.697.698.198.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProductsSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:AutomotiveSegment


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
Value420475521464222439433464456455442449444454
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.398.398.497.996.696.997.797.297.497.397.797.697.697.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.398.398.497.996.696.997.797.297.497.397.797.697.697.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:OtherSegment


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7.3823738.1074039.9649977.85771131013121210111010
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.72.13.43.12.32.82.62.72.32.42.42.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.72.13.43.12.32.82.62.72.32.42.42.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:OtherSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value7.3823738.1074038.2624169.9649977.857711310131212101110109.179699109.2168137.8826758.3863139.8496999.397663119.7301779.9391828.7541778.3221667.9968559.1275088.8792859.3752377.6975147.1840266.5314696.337575.4346965.022262
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.71.62.13.43.12.32.82.62.72.32.42.42.22.02.42.11.72.02.32.22.92.42.52.32.32.32.62.62.82.72.52.42.41.91.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.71.62.13.43.12.32.82.62.72.32.42.42.22.02.42.11.72.02.32.22.92.42.52.32.32.32.62.62.82.72.52.42.41.91.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value474229453477468468453460454465459438443453419429423405405389379368350350338335326288286269260268280290260269243250222206201185
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService

gntx:AutomotiveProducts


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value464222439464456455442449444454
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax97.996.696.997.297.497.397.797.697.697.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax97.996.696.997.297.497.397.797.697.697.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

gntx:AutomotiveMirrorsElectronics, gntx:AutomotiveSegment


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value427210401418413408398399396404
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax90.191.688.487.688.287.387.886.987.286.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax90.191.688.487.688.287.387.886.987.286.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveMirrorsElectronics gntx:AutomotiveSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:FireProtectionProducts, gntx:OtherSegment


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6.3783034.837546.1687515.9772456.3592665.8522325.098835.9180855.813215.279658
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.32.11.41.31.41.21.11.31.31.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.32.11.41.31.41.21.11.31.31.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:FireProtectionProducts gntx:OtherSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:HomeLinkModules, gntx:AutomotiveSegment


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value37113845434644494750
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.85.08.59.59.210.09.910.710.510.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.85.08.59.59.210.09.910.710.510.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:HomeLinkModules gntx:AutomotiveSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:WindowsProducts, gntx:OtherSegment


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.5866943.020177.7373887.5034655.7270246.9381225.5068385.1509014.9228055.175073
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.81.31.71.61.21.51.21.11.11.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.81.31.71.61.21.51.21.11.11.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:WindowsProducts gntx:OtherSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementGeographical

gntx:AutomotiveProducts, country:DE


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value56237274737873818591
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax11.910.416.015.515.616.716.317.718.819.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.910.416.015.515.616.716.317.718.819.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts country:DE100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:AutomotiveProducts, country:JP


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value64375160555655554849
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.616.211.312.711.912.012.212.010.710.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.616.211.312.711.912.012.212.010.710.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts country:JP100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:AutomotiveProducts, country:MX


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value331345434244282223
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.05.910.19.29.09.56.24.95.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.05.910.19.29.09.56.24.95.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts country:MX100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:AutomotiveProducts, country:US


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value15655135145144141149151142140
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax33.024.329.930.530.830.232.932.931.430.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.024.329.930.530.830.232.932.931.430.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:AutomotiveProducts, gntx:OtherCountries


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value15391134139141135164160167173
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax32.439.829.629.330.128.936.235.036.737.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax32.439.829.629.330.128.936.235.036.737.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProducts gntx:OtherCountries100.0100.0100.0100.0100.0100.0282.8100.0100.0100.0

gntx:OtherProducts, country:US


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9.9649977.857711313121210111010
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.13.43.12.82.62.72.32.42.42.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.13.43.12.82.62.72.32.42.42.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:OtherProducts country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementBusinessSegments

gntx:AutomotiveProductsSegment


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value464222439464456455442449444454450428433445411419414393395379370360342341329326320280279262261274285
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax97.996.696.997.297.497.397.797.697.697.898.097.697.998.398.097.797.897.197.697.597.797.797.797.497.497.298.097.397.597.697.698.198.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax97.996.696.997.297.497.397.797.697.697.898.097.697.998.398.097.797.897.197.697.597.797.797.797.497.497.298.097.397.597.697.698.198.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveProductsSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:AutomotiveSegment


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value464222439464456455442449444454
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax97.996.696.997.297.497.397.797.697.697.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax97.996.696.997.297.497.397.797.697.697.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:AutomotiveSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:OtherSegment


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9.9649977.857711313121210111010
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.13.43.12.82.62.72.32.42.42.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.13.43.12.82.62.72.32.42.42.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax gntx:OtherSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllOtherSegments


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value9.9649977.8577113131212101110109.179699109.2168137.8826758.3863139.8496999.397663119.7301779.9391828.7541778.3221667.9968559.1275088.8792859.3752377.6975147.1840266.5314696.337575.4346965.022262
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.13.43.12.82.62.72.32.42.42.22.02.42.11.72.02.32.22.92.42.52.32.32.32.62.62.82.72.52.42.41.91.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.13.43.12.82.62.72.32.42.42.22.02.42.11.72.02.32.22.92.42.52.32.32.32.62.62.82.72.52.42.41.91.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value22212421212122222019191818182117161616161414131415131413141313131210111212121212121110109.8844459.621954
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.34.54.74.59.44.85.04.84.34.34.34.14.23.94.74.03.63.64.03.73.53.63.43.64.03.74.13.94.24.14.04.64.24.14.54.54.44.24.94.65.04.54.95.04.95.2

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2166224221972192210121582168216721422100208520692192225423522371236423632309225822072197214821242112209120221950189018651764169713661330126512541254125511761134111410911002822
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

us-gaap:Assets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value728689621870842724680
Percentage of Assets33.131.829.837.036.533.733.6
Percentage of Assets33.131.829.837.036.533.733.6
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, gntx:AutomotiveProductsSegment


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value143614631449147214571414
Percentage of Assets65.467.569.562.663.165.8
Percentage of Assets65.467.569.562.663.165.8
Percentage of Assets us-gaap:OperatingSegments gntx:AutomotiveProductsSegment100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value3316149.5765149.3841549.429994
Percentage of Assets1.50.70.70.40.40.4
Percentage of Assets1.50.70.70.40.40.4
Percentage of Assets us-gaap:OperatingSegments us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value250281233296278323230245238243223226270284302345360388399402422448426452465477451452442480436441144
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.612.610.613.513.315.010.611.311.111.610.710.912.312.612.914.615.216.417.317.819.120.419.821.322.022.922.323.223.425.724.726.011.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2166224221972192210121582168216721422100208520692192225423522371236423632309225822072197214821242112209120221950189018651764169713661330126512541254125511761134111410911002822
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value191619601963189518221834193819211904185718611843192119692049202620031974191018561784174817221671164716131571149714471384132712551207116211201092109410701027983963934893735698
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets88.487.489.486.586.785.089.488.788.988.489.389.187.787.487.185.484.883.682.782.280.979.680.278.778.077.177.776.876.674.375.374.088.387.488.687.187.385.387.386.786.585.689.189.50.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value3.3852062.0380346.0820075.5634455.6792963.2914731.0954862.7121712.3507951.1001540.074549-0.753382-0.271939-0.033166.6263796.3052944.8186774.199642.7889753.0457710.8709450.622330.82990710
Percentage of StockholdersEquity0.20.10.30.30.30.20.10.10.10.10.0-0.0-0.0-0.00.30.30.20.20.10.20.00.00.00.7
Percentage of Assets0.20.10.30.30.30.20.10.10.10.10.0-0.0-0.0-0.00.30.30.20.20.10.10.00.00.00.5
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value4.2650381.9546676.8510524.447062.7392440.214794-1.289103-0.7625050.499221-0.275734-1.600338-2.12199-0.4791042.2129897.1933836.0054153.1811560.745234-1.271305-1.1308361121171222181.541435
Percentage of StockholdersEquity0.20.10.30.20.20.0-0.1-0.00.0-0.0-0.1-0.1-0.00.10.40.30.20.0-0.1-0.10.71.71.61.22.52.50.2
Percentage of Assets0.20.10.30.20.10.0-0.1-0.00.0-0.0-0.1-0.1-0.00.10.30.30.10.0-0.1-0.10.61.21.41.12.22.20.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value0.879832-0.0833670.769045-1.116385-2.940052-3.076679-2.384589-3.474676-1.851574-1.375888-1.674887-1.368608-0.1943952.2712080.645030.002953-1.179199-2.674409-2.862999-1.311545-1.4738880.279935-0.0449091.403899
Percentage of StockholdersEquity0.0-0.00.0-0.1-0.2-0.2-0.1-0.2-0.1-0.1-0.1-0.1-0.00.10.00.0-0.1-0.1-0.1-0.1-0.10.0-0.00.1
Percentage of Assets0.0-0.00.0-0.1-0.1-0.1-0.1-0.2-0.1-0.1-0.1-0.1-0.00.10.00.0-0.0-0.1-0.1-0.1-0.10.0-0.00.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value859859852830818801807799777748745743748742723683596553478418395347270253
Percentage of StockholdersEquity44.943.843.443.844.943.741.741.640.840.340.040.339.037.735.335.834.635.236.137.438.538.936.736.3
Percentage of Assets39.738.338.837.939.037.137.336.936.335.635.735.934.232.930.829.627.827.427.133.133.634.732.90.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value1414141414141515151515151616161717178.7346818.5845818.6441748.5375288.3003638.25801
Percentage of StockholdersEquity0.70.70.70.80.80.80.80.80.80.80.80.90.80.80.80.91.01.10.70.80.81.01.11.2
Percentage of Assets0.70.60.70.70.70.70.70.70.70.70.70.80.70.70.70.70.80.90.50.70.70.91.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value1038108510891046986101811161107111110931102108611571208130112101109988818676610514438434
Percentage of StockholdersEquity54.255.355.555.254.155.557.657.658.458.959.258.960.261.463.563.464.462.961.660.359.557.659.662.3
Percentage of Assets47.948.449.647.747.047.251.551.151.952.152.952.552.853.655.452.451.648.946.453.451.951.353.40.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9241010979975859910950987930886850827943114111841203120411941154110810551060984979955930856799733703601523855795744739776786752758725722655505
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 Assets42.745.144.644.540.942.243.845.643.442.240.840.043.050.650.450.851.050.550.049.147.848.245.846.145.244.542.441.038.837.734.130.962.659.858.858.961.962.664.066.865.166.265.461.4

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value353455423400343278296260260221217194296524569561580559546534499626551564569549497433391374309226502442389381375370357397444440348303295340336294317
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 Assets16.320.319.318.316.412.913.712.012.110.610.49.413.523.324.223.724.623.723.723.722.628.525.726.627.026.324.622.220.720.117.513.436.833.330.830.430.029.530.435.039.940.334.70.00.00.040.90.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value353455423400343278296260260221217194296524569546
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.320.319.318.316.412.913.712.012.110.610.49.413.523.324.223.7

Short Term Investments

us-gaap:ShortTermInvestments

us-gaap:ShortTermInvestments


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13252752701311402071901801691431711521521781841761771521459.5952624.5473550.00.00.0927560214551605924418617
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.61.21.22.43.36.16.59.68.98.68.16.97.86.86.57.57.87.57.76.76.60.40.20.00.00.06.85.74.81.73.74.15.25.22.23.88.62.1

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2342772842681702332352532262442132472392462312402292492112292192231952081962011681861781711431521201211091261291391101301111169571
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.812.413.012.28.110.810.911.710.611.610.212.010.910.99.810.19.710.69.210.29.910.29.19.89.39.68.39.69.49.28.19.08.89.28.710.110.411.19.411.510.010.79.58.7

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value26323322623325925124823822522522521321220721620619619718917917618817416415014514113512512812011711613015917719220018815111910410053
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.210.410.310.612.411.611.511.010.510.710.810.39.79.29.28.78.38.38.27.98.08.68.17.77.17.07.07.06.66.96.86.98.59.812.614.115.316.016.113.310.79.510.06.5

Inventory Finished Goods

us-gaap:InventoryFinishedGoods

us-gaap:InventoryFinishedGoods


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value494241424547504846455046494347493940414035363633313026242425232120202025333232342524
Percentage of InventoryFinishedGoods100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.31.91.92.02.22.22.32.22.22.22.42.22.32.02.02.11.71.71.81.81.61.71.71.61.51.41.31.31.31.41.31.31.51.51.62.02.72.62.83.12.32.5

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value591717201516292827142529231114161311301315115741383349443829282724242433322334202524
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.80.80.80.90.70.81.41.31.30.71.21.41.10.50.60.70.60.51.30.60.70.52.72.01.81.62.42.32.01.61.61.61.81.91.92.72.61.92.91.82.32.4

Machinery And Equipment Gross

us-gaap:MachineryAndEquipmentGross

us-gaap:MachineryAndEquipmentGross


Machinery
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value857843838790721616554507472415352327
Percentage of MachineryAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets39.038.940.233.631.228.727.428.837.435.335.239.8

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value12571227119711441047933842772716603486446
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets57.256.657.448.645.343.541.643.856.651.448.554.3

Construction In Progress Gross

us-gaap:ConstructionInProgressGross

us-gaap:ConstructionInProgressGross


Construction
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value49391835308456414558136.973175
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.21.80.91.51.34.02.82.43.65.01.30.8

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value789728699651581521468415366321281249
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets35.933.633.527.725.224.323.223.528.927.328.130.3

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.65.65.65.65.65.65.65.65.65.65.65.65.65.7
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value458460468474485493498491501492498497499496492493482473465450431414412388375372373363358358357351345348349341326309282256232213205197
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 Assets21.220.521.321.623.122.823.022.723.423.523.924.022.822.020.920.820.420.020.220.019.618.919.218.317.817.818.518.619.019.220.220.725.326.227.627.226.124.724.022.620.919.620.524.0

Long Term Investments

us-gaap:LongTermInvestments

us-gaap:LongTermInvestments


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1931721621591711771391031211261371411413.2457514961495773719594114115114104109108107114136158141145137146128106142142129109
Percentage of LongTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.97.77.47.38.18.26.54.85.66.06.66.86.40.12.52.22.12.62.22.53.33.24.44.45.45.55.75.35.85.86.16.710.011.911.211.611.011.610.99.412.813.012.913.3

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value3113143113113093073073073073073073073073073073073073073073073073073073073073073073073073073073370.0
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets14.414.014.214.214.714.214.214.214.314.614.714.914.013.613.113.013.013.013.313.613.914.014.314.514.514.715.215.816.316.517.419.90.0

us-gaap:Goodwill us-gaap:BusinessAcquisition

gntx:GuardianOpticalTechnologies


Goodwillus-gaap:
Period End2021-03-03
Value2.758721
Percentage of Goodwill0.0
Percentage of Assets0.0
Percentage of Assets gntx:GuardianOpticalTechnologies0.0

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:BusinessAcquisition, us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

gntx:AirCraftGlass, us-gaap:InProcessResearchAndDevelopment


Indefinite
Period End2021-06-302021-03-312020-12-312020-09-30
Value1.251.3892371.3949951.011399
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0
Percentage of Assets0.10.10.10.0
Percentage of Assets gntx:AirCraftGlass us-gaap:InProcessResearchAndDevelopment0.00.00.00.0

gntx:AirCraftglass, us-gaap:InProcessResearchAndDevelopment


Indefinite
Period End2020-12-31
Value1.394995
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0
Percentage of Assets0.1
Percentage of Assets gntx:AirCraftglass us-gaap:InProcessResearchAndDevelopment0.0

gntx:GuardianOpticalTechnologies, us-gaap:InProcessResearchAndDevelopment


Indefinite
Period End2021-06-302021-03-31
Value1111
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill900.8863.4
Percentage of Assets0.50.5
Percentage of Assets gntx:GuardianOpticalTechnologies us-gaap:InProcessResearchAndDevelopment0.00.0

gntx:HomeLink, us-gaap:LicensingAgreements


Indefinite
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value969696969696969696969696969696969696969687
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill6881.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets4.44.44.64.14.04.14.14.24.34.34.44.54.54.54.64.74.95.15.15.45.1
Percentage of Assets gntx:HomeLink us-gaap:LicensingAgreements0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value251256249247251245250255260264269274279284288293298303308313317322327332337342346351356361366370272829281213131212131310
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.611.511.411.312.011.411.511.812.112.612.913.312.712.612.312.412.612.813.313.914.414.715.215.616.016.417.218.018.919.420.821.82.02.22.32.21.01.01.11.11.21.21.31.3

us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:BusinessAcquisition

gntx:HomeLink


Intangible
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value249250269288293298303308313317322327332337342346351356361366343
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.092.6
Percentage of Assets11.411.512.912.312.412.612.813.313.914.414.715.215.616.016.417.218.018.919.420.820.2
Percentage of Assets gntx:HomeLink0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass

gntx:PatentsandOtherIntangibleAssets


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value264270263262266260265270275280285290295300304309315319324329334340345350355360365
Percentage of IntangibleAssetsNetExcludingGoodwill105.5105.5105.6105.8105.8105.9105.9105.9105.9105.8105.8105.8105.8105.8105.5105.5105.5105.4105.4105.3105.4105.4105.5105.3105.4105.5105.5
Percentage of Assets12.212.112.012.012.712.012.212.512.813.313.714.013.513.313.013.113.313.514.114.615.215.516.116.516.817.218.1
Percentage of Assets gntx:PatentsandOtherIntangibleAssets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsNet

gntx:HomeLink, us-gaap:CustomerContracts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value111620242526272930313233343536373839404143
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.71.01.11.11.11.21.31.31.41.51.61.61.71.71.92.02.12.22.42.5
Percentage of Assets gntx:HomeLink us-gaap:CustomerContracts0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

gntx:HomeLink, us-gaap:DevelopedTechnologyRights


Finite
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value7186101116120123127131135138142146150153157161165168172176166
Percentage of FiniteLivedIntangibleAssetsNet602.5534.9495.7470.2465.1460.5456.2452.2448.5445.1441.9438.9436.0433.4430.9428.6426.4424.3422.3420.4386.0
Percentage of Assets3.24.04.94.95.15.25.45.76.06.36.56.87.17.37.58.08.58.99.210.09.8
Percentage of Assets gntx:HomeLink us-gaap:DevelopedTechnologyRights0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerContracts


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value9.6751011121315161718192021222324
Percentage of FiniteLivedIntangibleAssetsNet0.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0
Percentage of Assets0.40.50.50.60.70.70.70.80.90.91.01.01.01.01.1
Percentage of Assets us-gaap:CustomerContracts0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DevelopedTechnologyRights


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value63677175788286909397101105108112116
Percentage of FiniteLivedIntangibleAssetsNet0.00.0602.50.00.00.0534.90.00.00.0495.70.00.00.0470.2
Percentage of Assets2.93.03.23.43.73.84.04.24.44.64.95.15.05.04.9
Percentage of Assets us-gaap:DevelopedTechnologyRights0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Patents


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value131314141414141515151515161615161616161617171717181819
Percentage of FiniteLivedIntangibleAssetsNet0.00.0119.20.00.00.092.00.00.00.077.00.00.00.064.362.761.358.956.954.954.754.254.051.251.151.050.7
Percentage of Assets0.60.60.60.60.70.70.70.70.70.70.80.80.70.70.70.70.70.70.70.70.80.80.80.80.90.90.9
Percentage of Assets us-gaap:Patents0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TechnologyBasedIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value0.2756180.2613630.2621290.2579410.247756
Percentage of FiniteLivedIntangibleAssetsNet0.00.02.20.00.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets us-gaap:TechnologyBasedIntangibleAssets0.00.00.00.00.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value783771750743756754720687711721736744749616675674676695688698719722751756782788792787798802805822164186171173150159141119155155142119
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 Assets36.134.434.133.936.035.033.231.733.234.335.336.034.227.328.728.428.629.429.830.932.632.935.035.637.037.739.240.442.243.045.748.412.114.013.513.812.012.712.010.614.014.214.214.5

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value10110784906010097959090929010677897982777971817966836973716855645650433343525372657063614027
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.74.83.94.12.94.64.54.44.24.34.54.44.93.43.83.43.53.33.53.13.73.63.13.93.33.53.53.53.03.53.23.03.22.53.44.24.35.85.66.25.75.64.03.3

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3.7902190.0249524.2936080.3600140.5728340.1482510.768142131.582570.0
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.20.00.20.00.00.00.00.80.10.0

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value9511692121828874868794768284100751851881966985871156497859061747210263706076445252573546405431
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.45.24.25.53.94.13.44.04.14.53.74.03.94.53.27.88.08.33.03.84.05.33.04.64.04.33.13.83.95.53.64.14.45.83.54.14.24.63.04.13.65.03.2

Dividends Payable Current

us-gaap:DividendsPayableCurrent

us-gaap:DividendsPayableCurrent


Dividends
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value292828282524232018171515
Percentage of DividendsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.31.31.41.21.11.21.21.21.51.51.61.8

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value196223177236217263171182177184169172214228243264271274149156169195131181155163133143128167119120103109871041061301001161031157258
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 Assets9.110.08.110.810.412.27.98.48.38.88.18.49.810.110.411.211.511.66.56.97.78.96.18.67.47.86.67.36.89.06.87.17.68.26.98.38.510.48.610.39.310.67.27.1

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2020-09-302020-06-302020-03-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value2575750.00.00.02350787.57.57.57.50.0
Percentage of LongTermDebtCurrent100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets1.13.63.50.00.00.01.12.23.30.30.30.40.40.0

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-09-30
Value1384400.01524400.01419100.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0
Percentage of Assets0.10.10.1

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value2011111411129.0504715.1277517.4971444.6310645.4280814.391978
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.50.60.60.50.60.40.30.60.40.50.5

Long Term Debt

us-gaap:LongTermDebt us-gaap:LongtermDebtType

us-gaap:LongTermDebt

us-gaap:RevolvingCreditFacility


Long
Period End2020-09-302019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value250.00.00.00.00.00.00.00.02060758585100100125125125
Percentage of LongTermDebt100.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.10.00.00.00.00.00.00.00.00.92.63.43.93.94.74.75.96.06.2
Percentage of Assets us-gaap:RevolvingCreditFacility0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-31
Value35403845505051565454757147
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.81.82.12.42.32.42.62.62.63.23.12.2

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value18181715109.0915097.4144246.9527036.1902195.5093730.0
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.90.80.80.70.50.40.30.30.30.30.0

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-09-30
Value899970.01151000.01430400.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0
Percentage of Assets0.00.10.1

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value430530.0429870.01086100.0825640.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0
Percentage of Assets0.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value38075.037495.0447580.0268700.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0
Percentage of Assets0.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value6369.05834.039246.032956.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0
Percentage of Assets0.00.00.00.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value2284400.02675400.03220500.02849500.02364600.01812700.01141700.01512800.01948700.0
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.1

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value2296500.02692400.03245800.02873700.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value12135.017007.025303.024182.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets0.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value191619601963189518221834193819211904185718611843192119692049202620031974191018561784174817221671164716131571149714471384132712551207116211201092109410701027983963934893735698
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets88.487.489.486.586.785.089.488.788.988.489.389.187.787.487.185.484.883.682.782.280.979.680.278.778.077.177.776.876.674.375.374.088.387.488.687.187.385.387.386.786.585.689.189.50.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value3.3852062.0380346.0820075.5634455.6792963.2914731.0954862.7121712.3507951.1001540.074549-0.753382-0.271939-0.033166.6263796.3052944.8186774.199642.7889753.0457710.8709450.622330.82990710
Percentage of StockholdersEquity0.20.10.30.30.30.20.10.10.10.10.0-0.0-0.0-0.00.30.30.20.20.10.20.00.00.00.7
Percentage of Assets0.20.10.30.30.30.20.10.10.10.10.0-0.0-0.0-0.00.30.30.20.20.10.10.00.00.00.5
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value4.2650381.9546676.8510524.447062.7392440.214794-1.289103-0.7625050.499221-0.275734-1.600338-2.12199-0.4791042.2129897.1933836.0054153.1811560.745234-1.271305-1.1308361121171222181.541435
Percentage of StockholdersEquity0.20.10.30.20.20.0-0.1-0.00.0-0.0-0.1-0.1-0.00.10.40.30.20.0-0.1-0.10.71.71.61.22.52.50.2
Percentage of Assets0.20.10.30.20.10.0-0.1-0.00.0-0.0-0.1-0.1-0.00.10.30.30.10.0-0.1-0.10.61.21.41.12.22.20.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value0.879832-0.0833670.769045-1.116385-2.940052-3.076679-2.384589-3.474676-1.851574-1.375888-1.674887-1.368608-0.1943952.2712080.645030.002953-1.179199-2.674409-2.862999-1.311545-1.4738880.279935-0.0449091.403899
Percentage of StockholdersEquity0.0-0.00.0-0.1-0.2-0.2-0.1-0.2-0.1-0.1-0.1-0.1-0.00.10.00.0-0.1-0.1-0.1-0.1-0.10.0-0.00.1
Percentage of Assets0.0-0.00.0-0.1-0.1-0.1-0.1-0.2-0.1-0.1-0.1-0.1-0.00.10.00.0-0.0-0.1-0.1-0.1-0.10.0-0.00.1
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value859859852830818801807799777748745743748742723683596553478418395347270253
Percentage of StockholdersEquity44.943.843.443.844.943.741.741.640.840.340.040.339.037.735.335.834.635.236.137.438.538.936.736.3
Percentage of Assets39.738.338.837.939.037.137.336.936.335.635.735.934.232.930.829.627.827.427.133.133.634.732.90.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value1414141414141515151515151616161717178.7346818.5845818.6441748.5375288.3003638.25801
Percentage of StockholdersEquity0.70.70.70.80.80.80.80.80.80.80.80.90.80.80.80.91.01.10.70.80.81.01.11.2
Percentage of Assets0.70.60.70.70.70.70.70.70.70.70.70.80.70.70.70.70.80.90.50.70.70.91.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value1038108510891046986101811161107111110931102108611571208130112101109988818676610514438434
Percentage of StockholdersEquity54.255.355.555.254.155.557.657.658.458.959.258.960.261.463.563.464.462.961.660.359.557.659.662.3
Percentage of Assets47.948.449.647.747.047.251.551.151.952.152.952.552.853.655.452.451.648.946.453.451.951.353.40.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1414141414141515151515151616161717171717171717171717178.7834598.7754248.75468.7346818.6837298.6555858.6150428.5845818.5652278.6739688.6530248.6441748.6083448.587118.5644488.5375288.300363
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.60.70.70.70.70.70.70.70.70.70.80.70.70.70.70.70.70.70.80.80.80.80.80.80.80.90.50.50.50.50.50.60.60.70.70.70.70.70.80.80.80.91.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value859859852830818801807799777748745743748742723713706701683655638607596584575567553515501490478455444429418410410401395379368359347270
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets39.738.338.837.939.037.137.336.936.335.635.735.934.232.930.830.129.929.729.629.028.927.627.827.527.327.127.426.426.626.327.126.932.532.333.132.732.732.033.633.533.132.934.732.9

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1038108510891046986101811161107111110931102108611571208130112891276125412101184113211261109107010461019988959919866818768733701676655660638610587561540514438
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 Assets47.948.449.647.747.047.251.551.151.952.152.952.552.853.655.454.454.053.152.452.451.351.351.650.449.548.748.949.248.646.446.445.353.752.753.452.252.750.951.951.850.449.551.353.4

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value4.2650381.9546676.8510524.447062.7392440.214794-1.289103-0.7625050.499221-0.275734-1.600338-2.12199-0.4791042.2129897.1933836.0054153.1811560.745234-1.271305-0.44278-3.475598-1.892082-1.130836-1.7616267.1399028.803947111417192122202217181521127.721795242722
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.10.30.20.10.0-0.1-0.00.0-0.0-0.1-0.1-0.00.10.30.30.10.0-0.1-0.0-0.2-0.1-0.1-0.10.30.40.60.70.91.01.21.31.51.71.41.41.21.71.10.72.22.52.2

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Accumulated
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value4.2650381.9546674.447062.7392440.214794-0.7625050.499221-0.275734-2.12199
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.10.20.10.0-0.00.0-0.0-0.1
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.0

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


Stock
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
Value4.3910449.26584187.9664898.3552047.3554889.5992762631105.4581548.3830731636
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
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
Value4.340719.229779187.938778.3104377.3190579.5570832631105.4259778.3409351636
Percentage of StockIssuedDuringPeriodValueNewIssues98.999.699.699.799.599.599.699.699.699.499.499.599.599.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stock
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
Value0.0503340.0360610.0649440.0277190.0447670.0364310.0421930.1062870.136170.058840.0321760.0421380.0812130.174274
Percentage of StockIssuedDuringPeriodValueNewIssues1.10.40.40.30.50.50.40.40.40.60.60.50.50.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6.7275135.894645117.3065435.4305836.356075.7437585.7882865.2762014.8629474.7474164.9056264.6754683.977471
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
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
Value6.7275135.894645117.3065435.4305836.356075.7437585.7882865.2762014.8629474.7474164.9056264.6754683.977471
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value611901351383915112211013913315410514414714888132131118991021516891831079985449793517497817440611620277736255.79779461
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 RevenueFromContractWithCustomerExcludingAssessedTax14.339.525.629.217.033.327.523.129.828.634.023.031.931.732.320.329.928.928.223.224.137.316.923.422.129.328.524.313.129.128.717.826.136.131.327.914.421.06.27.711.230.816.212.12.933.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-23.786422-40.6092541.7048672147-43.7161742.344528-11.017646-33.139864-14.8981-38.0001858.362459-185.656947292.847861-23.278169-20.780171-36.502091-51.125495-24.203699-174.703278-1.413636-36.930124-18.999108-18.677488-15.130941-34.188643-17.055611-11.169562-17.299667-6.638811-588.550411-5.185589-32.881808-58.227387-18.047886-21.989327-33.809644-51.628103-58.959894-13.79941420-13.721434-7.554762-44.379971-58.930326
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-5.6-8.40.34.520.5-9.60.5-2.3-7.1-3.2-8.41.8-40.86.30.6-5.3-4.7-8.0-12.2-5.6-41.2-0.3-9.1-4.9-4.9-4.1-9.8-4.9-3.3-5.2-2.0-203.9-1.8-12.2-22.4-6.7-7.8-11.6-19.8-21.9-5.78.3-6.2-3.7-22.0-31.7

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-140.514694-117.670032-114.280894-103.187281-21.029629-125.36099-88.200555-99.637167-67.842895-114.278821-93.202936-216.867293-186.902978-222.333463-143.559818-84.299791-90.65265-81.52053-55.355704-40.325659-54.30344-75.114335-44.457391-77.643107-45.273482-40.339061-1.637465-26.456469-16.2519-15.325712-4.119297261-9.508619-11.666429-14.592515-51.477718-13.505761-14.503926-3.727254-9.371542-9.142037-6.26384122-8.965094-7.0368622.367763
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-32.8-24.3-21.6-21.7-9.1-27.6-19.9-20.9-14.5-24.4-20.6-47.1-41.1-47.8-31.2-19.2-20.5-18.0-13.2-9.4-12.8-18.5-11.0-19.9-11.9-10.9-0.5-7.5-4.8-4.6-1.390.5-3.3-4.3-5.6-19.2-4.8-5.0-1.4-3.5-3.8-2.510.1-4.3-3.51.3

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-102.90794832225665-17.79669436-0.181809384.66329723-102.6821-227.624419-45.410936
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-24.06.74.311.928.4-3.98.1-0.08.21.05.1-22.3-50.0-9.8

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-2.002361-1.544501-5.859729-7.383531-0.586607-1.589855-5.5483551.9936851.429986-1.2338531.123309-2.7945110.00326-2.746797-21.851686-0.1528571.2900015.718363202.6061842.001664-2.40381823-8.364234-2.45727-0.01535414-0.4418912.28212-1.614318-1.455418-3.24693-0.844024-2.180428-2.079521.1935860.8491070.88031110-4.3001245.3244342.0036516.2262433.8632080.461572-0.160137
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value25252625272625262528212427282424252519232222162121211720191920141313121212129.3244361210109.029601109.8775059.675591
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-5.79964822-5.46445630-39.9982182.5452742.244125.26871-0.076409-2.692822.768335-16.74246529-12.590579.994933-3.0173955.206649-2.249358.962811-10.8223382.40397713-17.53848413-3.348461.8276772.84357512-8.5790047.8893586.1709326.54975910-10.19808-9.034321-1.280604-19.471127.515474-4.6870246.8746052.209920-35.4876695.842085-5.49469322
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-43.530647-7.2536921697-63.149663-1.832201-17.69838926-17.83996430-33.7843047.915723-7.02085915-9.38402811-20.20757937-17.6450449.793839-4.5465228-12.23421612-5.72237933-18.4033448.1310486.94368928-9.40778721-1.74010312-16.692854-3.67593-9.34836828-19.64949518-4.47116220-60.01047139.6269512
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value306.768464-7.066259-26.3700878.645992.0645581013-0.2085790.021443111.0183845.142701-9.5326311010-0.5480297.7768149.9578343.127006-12.3981791310135.2085453.8060656.15998410-3.1375938.2753032.6676051.404589-14.06772-29.860576-17.189189-15.21055-8.421155113731153.307536-85.617105121114
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value611901351383915112211013913315410514414714888132131118991021516891831079985449793517497817440611620277736255.79779461
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 RevenueFromContractWithCustomerExcludingAssessedTax14.339.525.629.217.033.327.523.129.828.634.023.031.931.732.320.329.928.928.223.224.137.316.923.422.129.328.524.313.129.128.717.826.136.131.327.914.421.06.27.711.230.816.212.12.933.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value86113143117-2.374033899911110810410611110911113090889788928680887874777072766869555245394140464043384236343432
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 RevenueFromContractWithCustomerExcludingAssessedTax20.223.527.124.7-1.019.722.423.423.222.323.424.224.023.928.420.620.021.521.121.420.419.821.820.119.720.920.320.622.720.421.419.218.216.915.215.614.515.915.516.115.816.916.616.616.917.5

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value86113143117-2.3740338999111108104106111109111
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.223.527.124.7-1.019.722.423.423.222.323.424.224.023.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

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

us-gaap:ProfitLoss

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Profit
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.3513540.3243540.7219320.0292090.2957520.103020.0699760.8139520.2054330.0002240.5653170.011937-0.1149050.5452060.1647180.4304860.094489-0.016076-0.3007710.2593811.3219821.2452341.6979761.1115671.5062384.2525063.2652242.4789264.2012413.2695811.834435
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.30.00.10.00.00.20.00.00.10.0-0.00.10.00.10.0-0.0-0.10.10.30.30.50.30.41.31.00.81.51.10.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6.7275135.8946457.5304217.3065449.6042926.356075.7437585.7882865.2762014.8629474.7474244.9056184.6754683.9774715.2861613.9760964.6917124.4229964.6893924.725884.8029744.9744534.8963845.3100695.4105875.8139515.7069925.4227375.4051824.742084.8989694.4503094.2278923.8500634.0718444.3702884.0311263.9605794.0128383.7651443.3180513.1015242.9822062.7997782.535812.334402
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-23.786422-40.6092541.7048672147-43.7161742.344528-11.017646-33.139864-14.8981-38.0001858.362459-185.656947292.847861-23.278169-20.780171-36.502091-51.125495-24.203699-174.703278-1.413636-36.930124-18.999108-18.677488-15.130941-34.188643-17.055611-11.169562-17.299667-6.638811-588.550411-5.185589-32.881808-58.227387-18.047886-21.989327-33.809644-51.628103-58.959894-13.79941420-13.721434-7.554762-44.379971-58.930326
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-5.6-8.40.34.520.5-9.60.5-2.3-7.1-3.2-8.41.8-40.86.30.6-5.3-4.7-8.0-12.2-5.6-41.2-0.3-9.1-4.9-4.9-4.1-9.8-4.9-3.3-5.2-2.0-203.9-1.8-12.2-22.4-6.7-7.8-11.6-19.8-21.9-5.78.3-6.2-3.7-22.0-31.7

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1812148.220007131526122816171625261729292729363420352818152219131617131112192829393535291917
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-140.514694-117.670032-114.280894-103.187281-21.029629-125.36099-88.200555-99.637167-67.842895-114.278821-93.202936-216.867293-186.902978-222.333463-143.559818-84.299791-90.65265-81.52053-55.355704-40.325659-54.30344-75.114335-44.457391-77.643107-45.273482-40.339061-1.637465-26.456469-16.2519-15.325712-4.119297261-9.508619-11.666429-14.592515-51.477718-13.505761-14.503926-3.727254-9.371542-9.142037-6.26384122-8.965094-7.0368622.367763
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-32.8-24.3-21.6-21.7-9.1-27.6-19.9-20.9-14.5-24.4-20.6-47.1-41.1-47.8-31.2-19.2-20.5-18.0-13.2-9.4-12.8-18.5-11.0-19.9-11.9-10.9-0.5-7.5-4.8-4.6-1.390.5-3.3-4.3-5.6-19.2-4.8-5.0-1.4-3.5-3.8-2.510.1-4.3-3.51.3

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value0.00.00.0750.00.0
Percentage of ProceedsFromIssuanceOfLongTermDebt0.00.00.0100.00.00.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value250.00.00.00.00.0232628299.375264116
Percentage of RepaymentsOfLongTermDebt100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfLongTermDebt us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility


Repayments
Period End2020-12-312020-09-30
Value2550
Percentage of RepaymentsOfLongTermDebt100.00.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value28292929292829292928282930282828252525252424242423232323202020202018181818171717171515151515
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Dividends

us-gaap:Dividends

us-gaap:Dividends


Dividends
Period End2021-03-022020-09-30
Value2929
Percentage of Dividends100.0100.0

us-gaap:Dividends us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Dividendsus-gaap:
Period End2021-07-21
Value28
Percentage of Dividends0.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-03-31
Value1159778310.017868966996691721462021015642304030474428322525209.9999570.00.00.00.00.00.0
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-0.416.1-1.516.943-0.0090.166-0.008-0.005-0.0010.1650.009-0.003-0.0010.156-0.0630.0060.0150.277-0.003-0.003-0.0040.32900.3250.3250.2880.3040.2740.3260.0030.3150.3250.30900.321
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value4.5335.4358.9441114
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value23.020.018.016.015.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value261515162628
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value4864000.06392000.04678000.04435000.03408000.05375000.08288000.07351000.04168000.02476000.02483000.02411000.02435000.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:GainOnDisposalOfAssets

gntx:GainOnDisposalOfAssets


Gain
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value17500.02391.0126310.03319.0151910.052718.052320.043338.0
Percentage of GainOnDisposalOfAssets100.0100.0100.0100.0100.0100.0100.0100.0

gntx:LossOnDispositionOfAssets

gntx:LossOnDispositionOfAssets


Loss
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1546.0131490.016358.057838.034078.054279.093244.0155630.0217770.0122300.0
Percentage of LossOnDispositionOfAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:NetDecreaseinCommonStockSharesfromSharesIssuedinShareBasedCompensationandSharesRepurchased

gntx:NetDecreaseinCommonStockSharesfromSharesIssuedinShareBasedCompensationandSharesRepurchased


Net
Period End2021-03-31
Value2200000.0
Percentage of NetDecreaseinCommonStockSharesfromSharesIssuedinShareBasedCompensationandSharesRepurchased100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

gntx:AirCraftGlass


Business
Period End2020-09-18
Value1.1
Percentage of BusinessCombinationConsiderationTransferred1100.0

gntx:ArgilInc


Business
Period End2020-12-14
Value3.7
Percentage of BusinessCombinationConsiderationTransferred10.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2828292929292829292928282930
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2828292929292829292928282930
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiRealizedGainLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Equity
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value332870.0444750.0410580.0913840.036974.0374370.0130400.088576.0260040.0
Percentage of EquitySecuritiesFvNiRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainOnSaleOfInvestments

us-gaap:GainOnSaleOfInvestments


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value0.4835380.4864331.6584070.4810740.9812220.0424610.0672920.374370.1304050.0885761.0303180.2630520.0002841.2450750.2806610.1520090.6016520.2748441.5132440.1582621.4989493.5553261.9222612.9128642.7509337.164035.0492296.5544968.5670870.03.613583
Percentage of GainOnSaleOfInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:GoodwillAcquiredDuringPeriod us-gaap:BusinessAcquisition

us-gaap:GoodwillAcquiredDuringPeriod

gntx:ArgilInc


Goodwill
Period End2020-12-31
Value900000.0
Percentage of GoodwillAcquiredDuringPeriod100.0

gntx:GuardianOpticalTechnologies


Goodwill
Period End2021-03-31
Value2800000.0
Percentage of GoodwillAcquiredDuringPeriod0.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-20.11648824-21.76645643-9.68784615-12.0438240.443891-6.08322220-6.187188-0.901871-15.81508723-1.051826-2.668244-10.71810127-11.8680.99055-28.84052950-30.90605111-5.91029327-11.3121272.69785-32.00126939-4.7297243.371414-15.50030630-7.307751-0.238493-4.66700620-11.4382196.029495-13.79234920-2.037067-6.026396-13.26825521
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.1852471.6438841.000615-0.5597351.3419642.544554-0.0843812.0895871.186272-0.1642151.0459171.5913443.011103-0.045322-0.213709-0.648746-2.3719350.5883614.8615560.1288782.423636-0.1359040.9110690.847274-0.066351.1506420.9309870.5301360.3983020.285354-0.0284570.070561-0.1754430.7068991.565317150.900961-0.1754190.8620120.913631-0.234994-2.2390061.675929-1.388123.4404382.043241
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value42-0.768229-1.5596965.295729-1.45098-12.7790460.9165120.41836913-10.847705-3.5292925.62646312-2.872873-1.6432652.2717712.045322-18.85750117-1.6331643.639556-23.521639182.506913.606578-15.2195548.5321775.6048388.34374-0.5341332.3625510.341903-0.195661-0.13388-10.46483-1.0981138.571048-11.87684713-5.5539733.946778-4.712492.333351-1.0306310.121993-2.777951
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeNonoperating

us-gaap:InvestmentIncomeNonoperating


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.9031391.023411.2523641.8252571.4620332.4466492.4740583.353512.1403873.2627413.1999643.1806832.8441332.0376054.0943352.1393871.7361381.4725272.3064290.9165560.7741020.7900413.1292660.4954680.7540520.6120254.8870730.4064910.3980050.3251585.1295030.4740840.6257170.4954133.490940.5865170.63370.5960232.5237880.5439960.5984550.499571.2129090.620160.5560040.512883
Percentage of InvestmentIncomeNonoperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LossOnSaleOfInvestments

us-gaap:LossOnSaleOfInvestments


Loss
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-312013-12-312013-09-302012-12-312012-09-30
Value150660.041681.0921140.070499.067384.05487.00077113.091049.0374750.0270530.0
Percentage of LossOnSaleOfInvestments100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0

us-gaap:NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic

us-gaap:NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-03-31
Value85111141115-2.813368898110107103110
Percentage of NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value963200.0-852410.01823700.0136630.0-692090.0-1623100.0-475690.0299000.0-1174200.0-2465600.01626200.01182200.01495200.0188590.0162340.0-1753800.0324840.0-396690.0300770.0-942970.0-269390.0-241490.0-91250.0273100.0229120.0-601750.0493540.0275650.0-784990.0344780.0
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1.610141-3.6926190.2085033.1097552.2251960.6571281.3536611.0955811.641882-0.27601-0.2385550.5485060.3330221.3717121.1642431.5753830.1736912.2693150.232539-0.5083480.213391-6.353685-3.186497-2.073471-0.252086-1.6043382.527930.864912.2069155.2405760.881267.811095
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.963199-0.8524121.8236670.136627-0.69209-1.623102-0.4756860.298999-0.306279-1.174213-2.4656031.6261780.6420771.1821521.495210.18859-1.5514540.162343-1.7538230.324844-0.409916-0.3966850.300767-0.942974-0.501892-0.269392-0.241489-0.091250.1485260.2730970.229115-0.601749
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax59.823.1874.64.4-31.1-247.0-35.127.3-18.7425.41033.6296.5192.886.2128.412.0-893.27.2-754.2-63.9-192.16.2-9.445.5199.116.8-9.6-10.66.75.226.0-7.7

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2.66848-5.9713652.5418371.677023.1591882.08764-0.95635-1.1656641.1074031.5972350.741731-1.76747-2.7522991.6719451.481913.708472.942463.000819-0.4392544.578457-1.491812-1.3460621.19117-13.481059-2.722022-3.352349-4.075521-5.054893-2.894683-3.784041-0.2699521.872074-3.4452258.593112-1.1059654.47383-9.66775513
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2310400.0-4896400.02404000.01707800.02524400.01503900.0-526600.0-1261700.0774960.01324600.0521650.0-1642900.0-2692100.01662300.01188000.02824300.02435900.02016500.0-828520.03032800.0-1583500.0-761250.0630790.0-8901500.0-1664000.0-2509100.0-2824800.0-3380000.0-1966100.0-2491600.0-123480.01312400.0-2159200.05374900.0-546140.03004500.0-6558800.09129000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeLossTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value358110.0-1075000.0-30796.0634740.0583740.096062.0332450.0272630.0-124580.0-60206.09611.0884210.0506540.0984280.01545600.091704.0-584820.0-4579500.0-1058000.0-843280.0-1674900.0-928620.0-1292500.0559640.0-1286000.03218200.0-559830.01469400.0-3109000.04729900.0
Percentage of OtherComprehensiveIncomeLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value1.705281-5.1189530.656407-0.1466473.0225612.77973-2.0464370.4574381.5830891.2982361.048012-0.609422-0.302252-0.021280.4939772.2871030.9523652.170254-0.395073.3458850.382485-0.319349-0.070754-11.808718-2.986559-0.577685-2.097927-4.785501-2.653194-3.692791-0.4184781.598977-3.674349.194861-1.59954.198182-8.88276313
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic


Participating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-03-31
Value1324800.01671200.02058900.01697300.0439330.01221000.01329300.01389700.01256200.01081900.0833320.0
Percentage of ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted


Participating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-03-31
Value3980.010883.0-20963.04742.004184.0-36493.06051.04848.03813.06011.0
Percentage of ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4031137.2830114.0440514886262118
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired


Payments
Period End2021-06-302021-03-312020-12-312020-09-302014-12-312013-12-312012-12-31
Value0.0123.173711.011390.00.0438860.0
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired0.0100.0100.0100.00.0100.00.0

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromIssuanceOfCommonStock


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value4.3910449.26584187.9664898.3552047.3554889.5992762631105.4581548.3830731636159.9668524.6926681725261810106.1989394.6782429.131177407.6074675.3493396.227631156.4959499.4385216.5922723.7908990.9780684.9736072.466307117.0403786.6333018.14219235
Percentage of ProceedsFromIssuanceOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value142.0252770191150.06.7143.013030183.05.06.06.06.15.50.00.00.00.00.00.00.00.0913.253.05.0391417
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value19158.8961059.9519562.4836263.1240080.0512281117
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value82106.017744.051964.0130990.034942.0165530.064108.01709500.0110280.0117460.0543890.014500.0112300.067400.057001.0103060.074700.015001.0148520.000516670.043540.0004.0188830.00035005.069950.0300940.06010.09500.052006.01001800.010803.002080.099623.030004.047505.024517.0219130.0114750.0146580.0
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2021-06-302020-06-30
Value0.2629690.721932
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.2629690.3513540.3243540.7219320.0292090.2957520.103020.0699760.8139520.2054330.0002240.5653170.011937-0.1149050.5452060.1647180.4304870.094489-0.016076-0.3007710.2593811.321982-1.245234-1.6979761.1115671.5062384.2525063.2652242.4789264.2012413.2695811.834435
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RestrictedStockExpense us-gaap:AwardType

us-gaap:RestrictedStockExpense

us-gaap:PerformanceShares


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value0.7015240.1042312.0633191.4037990.5637830.3937770.263560.2633920.2577560.00.00.0
Percentage of RestrictedStockExpense100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:RestrictedStockExpense us-gaap:PlanName

gntx:RestrictedStockPlan


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4.4594014.3029754.4036734.3660257.5804924.3623183.880783.8439623.2744112.7235792.5274412.4809112.1899381.643061.3385191.788162
Percentage of RestrictedStockExpense635.74128.3213.4311.01344.61107.81472.41459.41270.40.00.00.00.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1.861.90.011.980.01990.02-0.00020.01990.02030.02030.00010.01990.01990.0202-0.00050.0210.02150.02180.02190.02180.02150.02120.02120.02140.02360.02240.02330.02640.02680.02770.02670.02630.0260.02650.02680.02730.02740.0273
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value27.6827.850.1227.720.27910.26520.00060.24250.23710.2356-0.00650.23320.23270.2326-0.00980.23090.28020.29810.32190.34140.34530.35810.35960.3680.3770.38920.40360.4490.45790.46130.46910.44510.44070.42210.4080.40390.41160.4104
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value0.870.92-0.010.280.00290.0037-0.00050.01550.01760.0223-0.00080.02940.02730.025600.01920.01890.0210.01140.01010.01380.01370.01630.01370.01790.01620.01740.01390.01410.00770.00640.00720.01010.00980.01620.02240.01270.0179
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value6.326.850.624.644.673.82-0.234.764.233.690.34.054.284.18-0.053.353.864.513.913.643.673.944.254.767.197.858.547.616.985.985.235.917.067.18.138.365.465.01
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesAcquisitions

us-gaap:StockIssuedDuringPeriodSharesAcquisitions


Stock
Period End2020-09-30
Value0
Percentage of StockIssuedDuringPeriodSharesAcquisitions0.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation


Stock
Period End2021-06-302021-03-31
Value800000.0600000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0

us-gaap:StockIssuedDuringPeriodValueAcquisitions

us-gaap:StockIssuedDuringPeriodValueAcquisitions


Stock
Period End2020-12-312020-09-302020-06-30
Value003559200.0
Percentage of StockIssuedDuringPeriodValueAcquisitions0.00.0100.0

us-gaap:StockIssuedDuringPeriodValueAcquisitions us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2020-12-312020-09-302020-06-30
Value003549400.0
Percentage of StockIssuedDuringPeriodValueAcquisitions0.00.099.7

us-gaap:CommonStock


Stock
Period End2020-12-312020-09-302020-06-30
Value009823.0
Percentage of StockIssuedDuringPeriodValueAcquisitions0.00.00.3

us-gaap:StockRepurchasedDuringPeriodShares

us-gaap:StockRepurchasedDuringPeriodShares


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302015-06-30
Value3.42.81.1999999999999990.07.03.63.14.77.51.427469
Percentage of StockRepurchasedDuringPeriodShares100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedDuringPeriodValue

us-gaap:StockRepurchasedDuringPeriodValue


Stock
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
Value1159778310.01786896699669172146202
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
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
Value108.54077.4028213.515510.0206.835079.7449457.963499128.345248181521
Percentage of StockRepurchasedDuringPeriodValue9.38.79.511.10.011.39.910.111.412.512.010.710.210.4

us-gaap:CommonStock


Stock
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
Value0.2046680.1653040.1470750.0705450.00.4211430.1444020.2141740.1844830.2834970.1994890.4504950.3770890.55989
Percentage of StockRepurchasedDuringPeriodValue0.20.20.20.20.00.20.20.20.30.30.30.30.30.3

us-gaap:RetainedEarnings


Stock
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
Value1048870280.01586186618361153131180
Percentage of StockRepurchasedDuringPeriodValue90.691.190.388.70.088.589.889.788.387.287.889.089.589.3

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1130300.02133800.0918950.001306600.01503100.01359800.01282400.01988000.02375400.02749900.02359000.03120400.04070900.02717200.02660800.02105700.02787600.03503800.03562700.0953260.01284400.01800100.0821140.0770290.0540810.0556680.01019000.01485200.01633200.01917800.02125000.01051800.01421500.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:BusinessAcquisitionAgreementValue us-gaap:BusinessAcquisition

gntx:BusinessAcquisitionAgreementValue

gntx:GuardianOpticalTechnologies


Business
Period End2021-03-03
Value12
Percentage of BusinessAcquisitionAgreementValue100.0

gntx:BusinessAcquisitionAgreementValue us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

gntx:GuardianOpticalTechnologies, us-gaap:SubsequentEvent


Business
Period End2021-01-06
Value12
Percentage of BusinessAcquisitionAgreementValue0.0

gntx:DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveYearsFairValue us-gaap:FinancialInstrument

gntx:DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveYearsFairValue

us-gaap:FixedIncomeSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-30
Value141129107113
Percentage of DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveYearsFairValue100.0100.0100.0100.0

gntx:DeferredTaxLiabilitiesDeferredExpenseExcessTaxOverBookDepreciation

gntx:DeferredTaxLiabilitiesDeferredExpenseExcessTaxOverBookDepreciation


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value163039466553
Percentage of DeferredTaxLiabilitiesDeferredExpenseExcessTaxOverBookDepreciation100.0100.0100.0100.0100.0100.0

gntx:LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour

gntx:LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour


Lessee
Period End2021-06-302020-12-312020-09-30
Value127.06173.05951.0
Percentage of LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour100.0100.0100.0

gntx:PatentAndOtherAssetsNet

gntx:PatentAndOtherAssetsNet


Patent
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-03-312017-12-31
Value262626242423222120
Percentage of PatentAndOtherAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:PatentandOtherAssetsNet

gntx:PatentandOtherAssetsNet


Patentand
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value262222222221212120
Percentage of PatentandOtherAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

gntx:PercentageNetSalesInvoicedAndPaidInForeignCurrencies

gntx:PercentageNetSalesInvoicedAndPaidInForeignCurrencies


Percentage
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value7.00.070.080.080.070.060.060.070.080.09
Percentage of PercentageNetSalesInvoicedAndPaidInForeignCurrencies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedRoyaltiesCurrent

us-gaap:AccruedRoyaltiesCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value211716141110129.3744499.8897086.7458774.9881323.130274
Percentage of AccruedRoyaltiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value6.0820071.0954860.0745496.6263792.7889750.829907101915102115
Percentage of AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value769040.0-2384600.0-1674900.0645030.0-2863000.0-44909.01403900.02507900.02458900.02130000.0566900.02743800.0
Percentage of AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure

us-gaap:AssetsFairValueDisclosure


Assets
Period End2021-06-302021-03-312020-12-312019-12-312018-12-31
Value551650608567520
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Assets
Period End2021-06-302021-03-312020-12-312019-12-312018-12-31
Value358462430352369
Percentage of AssetsFairValueDisclosure65.171.170.762.171.0

us-gaap:FairValueInputsLevel2


Assets
Period End2021-06-302021-03-312020-12-312019-12-312018-12-31
Value192188178214151
Percentage of AssetsFairValueDisclosure34.928.929.337.929.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-31
Value6.9711594.1671498.2600427.6477437.2444694.8993121.9742550.44080710
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AssetBackedSecurities, us-gaap:OtherLongTermInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.0697180.0690010.8008021.0866331.0322180.9888080.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax1.01.79.714.214.220.20.0

us-gaap:CertificatesOfDeposit, us-gaap:OtherLongTermInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.0975110.110690.1416220.1596560.1662380.0876170.058808
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax1.42.71.72.12.31.83.0

us-gaap:CertificatesOfDeposit, us-gaap:ShortTermInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.0101070.0170970.0145060.0182780.0235580.00.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.10.40.20.20.30.00.0

us-gaap:CorporateBondSecurities, us-gaap:OtherLongTermInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.3620010.2986150.4290150.377020.8717980.3306910.509868
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax5.27.25.24.912.06.725.8

us-gaap:CorporateBondSecurities, us-gaap:ShortTermInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.0070430.0129020.0709620.1348850.1389750.0848380.194061
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.10.30.91.81.91.79.8

us-gaap:MunicipalBonds, us-gaap:OtherLongTermInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value6.3095933.5792446.6354285.580674.7072572.9054051.036116
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax90.585.980.373.065.059.352.5

us-gaap:MunicipalBonds, us-gaap:ShortTermInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.0246210.0730130.1243890.1609450.0361470.004123
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.41.81.52.10.50.1

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:ShortTermInvestments


Available
Period End2020-12-312019-12-31
Value0.0433180.099917
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.55.1

us-gaap:USTreasurySecurities, us-gaap:OtherLongTermInvestments


Available
Period End2021-06-302020-06-302020-03-312019-12-31
Value0.0903330.0022310.1582190.075485
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax1.30.03.23.8

us-gaap:USTreasurySecurities, us-gaap:ShortTermInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.0002320.0065870.0433180.1296560.2660470.3396110.099917
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.00.20.51.73.76.95.1

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-31
Value2686100.01587400.0561300.0605410.055485.0732890.0587560.0366260.0367840.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AssetBackedSecurities, us-gaap:OtherLongTermInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value585460.0562030.0557380.0595570.031811.0406740.0180130.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax21.835.499.398.457.355.530.7

us-gaap:CertificatesOfDeposit, us-gaap:ShortTermInvestments


Available
Period End2021-06-302021-03-312020-06-302020-03-312019-12-31
Value1552.0607.0000
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.10.00.00.00.0

us-gaap:CorporateBondSecurities, us-gaap:OtherLongTermInvestments


Available
Period End2021-06-302021-03-312020-06-302020-03-312019-12-31
Value119740.0194760.00205070.00
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax4.512.30.028.00.0

us-gaap:MunicipalBonds, us-gaap:OtherLongTermInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1971400.0632410.03922.09841.021385.0102680.0395420.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax73.439.80.71.638.514.067.3

us-gaap:USTreasurySecurities, us-gaap:OtherLongTermInvestments


Available
Period End2021-06-302021-03-312020-06-302020-03-312019-12-31
Value7919.0197550.0000
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.312.40.00.00.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis


Available
Period End2020-12-312019-12-312018-12-312017-12-31
Value177269303196
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AssetBackedSecurities, us-gaap:OtherLongTermInvestments


Available
Period End2020-12-312019-12-31
Value3725
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis21.29.6

us-gaap:CertificatesOfDeposit, us-gaap:OtherLongTermInvestments


Available
Period End2020-12-312019-12-31
Value3.5038983.5
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis2.01.3

us-gaap:CertificatesOfDeposit, us-gaap:ShortTermInvestments


Available
Period End2020-12-312019-12-31
Value1.50218750
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.818.6

us-gaap:CorporateBondSecurities, us-gaap:OtherLongTermInvestments


Available
Period End2020-12-312019-12-31
Value8.5950222
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis4.88.3

us-gaap:CorporateBondSecurities, us-gaap:ShortTermInvestments


Available
Period End2020-12-312019-12-31
Value7.08463829
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis4.010.8

us-gaap:MunicipalBonds, us-gaap:OtherLongTermInvestments


Available
Period End2020-12-312019-12-31
Value10071
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis56.826.7

us-gaap:MunicipalBonds, us-gaap:ShortTermInvestments


Available
Period End2020-12-31
Value10
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis5.7

us-gaap:OtherDebtSecurities, us-gaap:ShortTermInvestments


Available
Period End2020-12-312019-12-31
Value1.5288612.63175
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.91.0

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:ShortTermInvestments


Available
Period End2020-12-312019-12-31
Value6.63513258
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis3.721.6

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:FixedIncomeSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value42395030
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:FixedIncomeSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value12242549
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:AvailableForSaleSecuritiesDebtSecurities


Available
Period End2020-12-312019-12-312018-12-312017-12-31
Value185271520776
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument

us-gaap:FixedIncomeSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-31
Value196193183192268301
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.099.20.099.057.9

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AssetBackedSecurities, us-gaap:OtherLongTermInvestments


Available
Period End2020-12-312019-12-31
Value3725
Percentage of AvailableForSaleSecuritiesDebtSecurities20.59.5

us-gaap:CertificatesOfDeposit, us-gaap:OtherLongTermInvestments


Available
Period End2020-12-312019-12-31
Value3.645523.557798
Percentage of AvailableForSaleSecuritiesDebtSecurities2.01.3

us-gaap:CertificatesOfDeposit, us-gaap:ShortTermInvestments


Available
Period End2020-12-312019-12-31
Value1.51669350
Percentage of AvailableForSaleSecuritiesDebtSecurities0.818.5

us-gaap:CorporateBondSecurities, us-gaap:OtherLongTermInvestments


Available
Period End2020-12-312019-12-31
Value9.02403522
Percentage of AvailableForSaleSecuritiesDebtSecurities4.98.4

us-gaap:CorporateBondSecurities, us-gaap:ShortTermInvestments


Available
Period End2020-12-312019-12-31
Value7.155629
Percentage of AvailableForSaleSecuritiesDebtSecurities3.910.8

us-gaap:MunicipalBonds, us-gaap:OtherLongTermInvestments


Available
Period End2020-12-312019-12-31
Value10772
Percentage of AvailableForSaleSecuritiesDebtSecurities58.026.8

us-gaap:MunicipalBonds, us-gaap:ShortTermInvestments


Available
Period End2020-12-31
Value10
Percentage of AvailableForSaleSecuritiesDebtSecurities5.6

us-gaap:OtherDebtSecurities, us-gaap:ShortTermInvestments


Available
Period End2020-12-312019-12-31
Value1.5288612.63175
Percentage of AvailableForSaleSecuritiesDebtSecurities0.81.0

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:ShortTermInvestments


Available
Period End2020-12-312019-12-31
Value6.6784558
Percentage of AvailableForSaleSecuritiesDebtSecurities3.621.5

us-gaap:BuildingsAndImprovementsGross

us-gaap:BuildingsAndImprovementsGross


Buildings
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value350344340317294232231223198130120112
Percentage of BuildingsAndImprovementsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessAcquisitionCostOfAcquiredEntityTransactionCosts us-gaap:IncomeStatementLocation

us-gaap:BusinessAcquisitionCostOfAcquiredEntityTransactionCosts

us-gaap:SellingGeneralAndAdministrativeExpenses


Business
Period End2021-06-302021-03-312020-12-312020-09-30
Value350000.0350000.0650000.0600000.0
Percentage of BusinessAcquisitionCostOfAcquiredEntityTransactionCosts100.0100.0100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets

gntx:GuardianOpticalTechnologies


Business
Period End2021-03-03
Value14
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets

gntx:GuardianOpticalTechnologies


Business
Period End2021-03-03
Value32000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities

gntx:GuardianOpticalTechnologies


Business
Period End2021-03-03
Value0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities0.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets

gntx:GuardianOpticalTechnologies


Business
Period End2021-03-03
Value1049100.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities

gntx:GuardianOpticalTechnologies


Business
Period End2021-03-03
Value2758700.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment

gntx:GuardianOpticalTechnologies


Business
Period End2021-03-03
Value15000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles

gntx:GuardianOpticalTechnologies, us-gaap:InProcessResearchAndDevelopment


Business
Period End2021-03-03
Value11
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities

gntx:GuardianOpticalTechnologies


Business
Period End2021-03-03
Value2758700.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet

gntx:GuardianOpticalTechnologies


Business
Period End2021-03-03
Value12
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:CashAndCashEquivalentsFairValueDisclosure


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value353455423400343278296260260221217194296524569561580559546534499626551564569549497433391374309226502442389381375370357397444348
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value353455423400343278296260260221217194296524569561580559546534499626551564569549497433391374309226502442389381375370357397444348
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAmortizedCostCurrent

us-gaap:DebtSecuritiesAvailableForSaleAmortizedCostCurrent


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value193192177195225295269
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAmortizedCostCurrent us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AssetBackedSecurities, us-gaap:OtherLongTermInvestments


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value29273741414325
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent15.314.221.221.218.314.69.6

us-gaap:CertificatesOfDeposit, us-gaap:OtherLongTermInvestments


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value2.5024492.5028133.5038983.7543124.0069125.0074543.5
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent1.31.32.01.91.81.71.3

us-gaap:CertificatesOfDeposit, us-gaap:ShortTermInvestments


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1.5028222.5028681.5021871.2521871.05050
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent0.81.30.80.60.416.918.6

us-gaap:CorporateBondSecurities, us-gaap:OtherLongTermInvestments


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value27208.595028.59891202022
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent14.310.44.84.49.06.98.3

us-gaap:CorporateBondSecurities, us-gaap:ShortTermInvestments


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value2.0132375.0521187.08463813182929
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent1.02.64.07.18.19.810.8

us-gaap:MunicipalBonds, us-gaap:OtherLongTermInvestments


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value8410310089898971
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent43.653.956.845.939.830.326.7

us-gaap:MunicipalBonds, us-gaap:ShortTermInvestments


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value7.9268911010104.2561842.079998
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent4.15.35.75.51.90.7

us-gaap:OtherDebtSecurities, us-gaap:ShortTermInvestments


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1.7136421.5253661.5288612.9417432.821512.8679062.63175
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent0.90.80.91.51.31.01.0

us-gaap:USTreasurySecurities, us-gaap:OtherLongTermInvestments


Debt
Period End2021-06-302021-03-312020-06-302020-03-312019-12-31
Value35130.6149957.1503656.012705
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent18.46.80.32.42.2

us-gaap:USTreasurySecurities, us-gaap:ShortTermInvestments


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.6017846.6348766.63513223434658
Percentage of DebtSecuritiesAvailableForSaleAmortizedCostCurrent0.33.53.711.819.215.721.6

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger


Debt
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312018-12-312017-12-31
Value1956500.01958500.00003000000.0285080.0
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger100.0100.00.00.00.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss


Debt
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312018-12-312017-12-31
Value411340.0411080.0000433.0104180.0
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss100.0100.00.00.00.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months


Debt
Period End2020-12-312019-12-312018-12-312017-12-31
Value12906831
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-31
Value2274700.01176300.0561300.0605410.055485.0732890.0587560.0365820.0263660.0
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition


Debt
Period End2020-12-312019-12-312018-12-312017-12-31
Value12907131
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-31
Value2686100.01587400.0561300.0605410.055485.0732890.0587560.0366260.0367840.0
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCompensationEquity us-gaap:PlanName

us-gaap:DeferredCompensationEquity

gntx:RestrictedStockPlan


Deferred
Period End2020-12-31
Value39
Percentage of DeferredCompensationEquity100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-31
Value65676975
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1163200.066830.0356040.03679700.03924900.03928800.0
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value119.1007459.5863728.594641820
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value136.4781465.1112424.5467674.282474.15766
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value332723182316
Percentage of DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value116.1716285.0890424.1727265.3688863.056712
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value3971300.02403100.01309800.04347900.02449000.02114400.0
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value18161518129.324478.9846097.7708687.1880926.5586385.7248184.674854
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:PerformanceShares


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value9.456469116.0621395.133554.9324015.4864252.2243282.4803212.726924
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:PlanName

gntx:EmployeeStockOptionPlan


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value8.999797.5245757.2201097.1535966.8826066.9993326.3165677.2356057.397817.6504729.600422
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized95.266.7119.1139.3139.5127.6284.0291.7271.30.00.0

gntx:RestrictedStockPlan


Employee
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value50394043464543
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized538.0348.2793.9878.9852.81839.61608.1

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-31
Value9000000.04000000.04000000.08600000.08700000.09000000.08600000.07600000.03850000.0
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312012-12-312011-12-312010-12-31
Value149144139135130125120115110106101969186826.1124.633.597
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:BusinessAcquisition

gntx:HomeLink


Finite
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value1391201018277726762575348433833282419149.654.8250.0
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

gntx:HomeLink, us-gaap:CustomerContracts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value31262218171615131211109.6758.67.5256.455.3754.33.2252.151.0750.0
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization22.322.322.322.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

gntx:HomeLink, us-gaap:DevelopedTechnologyRights


Finite
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value10893786360565248454137333026221815117.53.750.0
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization77.777.777.777.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

gntx:PatentsandOtherIntangibleAssets


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
Value17516916415915314814313713212712211611110610195898479736862575146403513
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization117.0117.4117.6117.8118.1118.3118.6119.1119.8120.2120.7121.1121.6122.8123.10.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CustomerContracts


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value333231302927262524232221201918
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization22.322.322.322.322.322.322.322.322.322.322.322.322.322.322.3

us-gaap:DevelopedTechnologyRights


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value11611210810510197939086827875716763
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization77.777.777.777.777.777.777.777.777.777.777.777.777.777.777.7

us-gaap:Patents


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value252524232323222222212120191918181717161515141313121111136.1
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization17.017.417.517.818.118.318.619.119.820.220.721.121.622.823.10.00.00.00.00.00.00.00.00.00.00.00.00.099.8

us-gaap:TechnologyBasedIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value0.0582320.0540620.0388560.0350020.031357
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.00.00.00.00.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

gntx:PatentsandOtherIntangibleAssets


Finite
Period End2020-12-31
Value22
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

gntx:PatentsandOtherIntangibleAssets


Finite
Period End2020-12-31
Value12
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2021-06-302021-03-312020-09-30
Value121216
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour us-gaap:FiniteLivedIntangibleAssetsByMajorClass

gntx:PatentsandOtherIntangibleAssets


Finite
Period End2020-12-31
Value16
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour0.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2021-06-302021-03-312020-09-30
Value161619
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree us-gaap:FiniteLivedIntangibleAssetsByMajorClass

gntx:PatentsandOtherIntangibleAssets


Finite
Period End2020-12-31
Value19
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree0.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2021-06-302021-03-312020-09-30
Value191921
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo us-gaap:FiniteLivedIntangibleAssetsByMajorClass

gntx:PatentsandOtherIntangibleAssets


Finite
Period End2020-12-31
Value22
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo0.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsGross

gntx:HomeLink, us-gaap:DevelopedTechnologyRights


Finite
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value180180180180180180180180180180180180180180180180180180180180166
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:Patents


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value383838383737373737363636363634343333333232323130303030
Percentage of FiniteLivedIntangibleAssetsGross0.00.021.50.00.00.020.70.00.00.020.40.00.00.019.419.118.918.718.317.917.917.817.717.117.016.916.7

us-gaap:TechnologyBasedIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value0.333850.3154250.3009850.2929430.279113
Percentage of FiniteLivedIntangibleAssetsGross0.00.00.20.00.0

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue


Held
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value42581224183690
Percentage of HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue


Held
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value40561224183690
Percentage of HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:IntangibleAssetsGrossExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value400401389383382371371371371371371371371371371
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IntangibleAssetsGrossExcludingGoodwill us-gaap:BusinessAcquisition

gntx:HomeLink


Intangible
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value389371371371371371371371371371371371371371371371371
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntangibleAssetsGrossExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass

gntx:PatentsandOtherIntangibleAssets


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value439440428421420408408408408407407407407407405405404404404403403403402401401401401
Percentage of IntangibleAssetsGrossExcludingGoodwill109.8109.8109.9110.0110.0110.1110.1110.0110.1109.9109.9109.7109.7109.8109.40.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InventoryRawMaterials

us-gaap:InventoryRawMaterials


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value17916015116017917016415814614313913413113213912712212211510810912111010593919085788075727486114123129141129977562
Percentage of InventoryRawMaterials100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcess

us-gaap:InventoryWorkInProcess


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value353032303433333231353533313130293433323130302726252424252221212320232428282626191913
Percentage of InventoryWorkInProcess100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentsAndCash

us-gaap:InvestmentsAndCash


Investments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-12-31
Value608603576578567561564524520476605676776792814797773744718707651658684665612537501483416340732676592547568546
Percentage of InvestmentsAndCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentsAndCash us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Investments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-12-31
Value430408351336352411411374369343475654751740757734719720701697646658684665612537501483416340640593529541535520
Percentage of InvestmentsAndCash70.767.761.158.262.173.273.071.571.072.278.596.896.793.593.092.193.096.897.698.699.3100.0100.0100.0100.0100.0100.0100.0100.0100.087.487.889.498.894.095.2

us-gaap:FairValueInputsLevel2


Investments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-12-31
Value17819422424121415015214915113212921255157635424179.5652134.5228750.00.00.00.00.00.00.00.00.09282626.3246023326
Percentage of InvestmentsAndCash29.332.338.941.837.926.827.028.529.027.821.53.23.36.57.07.97.03.22.41.40.70.00.00.00.00.00.00.00.00.012.612.210.61.26.04.8

us-gaap:InvestmentsFairValueDisclosure

us-gaap:InvestmentsFairValueDisclosure


Investments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312010-12-31
Value198194185202232299271301304302303282309152207230233238226209218809994114115114104109108107114229234202166188215
Percentage of InvestmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value1046500.01044700.01666700.01346000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2021-06-302021-03-312020-09-30
Value774900.01174500.0394430.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2021-06-302021-03-312020-12-312020-09-30
Value1.11.21.21.2
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value3.5993.5754.8426.549.397
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value1358000.01859000.04101000.05297000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value20.018.016.015.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value48472458
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1


Sharebased
Period End2020-12-312019-12-312018-12-312017-12-31
Value18201632
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares


Sharebased
Period End2020-12-312019-12-312018-12-312017-12-31
Value3175000.03575000.04842000.06540000.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue


Sharebased
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.04.04.04.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued

us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value577000.0574000.0315000.0433000.0277000.0325000.0821000.0555000.0250000.095000.0171000.0
Percentage of UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowancesAndReservesBalance us-gaap:ValuationAllowancesAndReservesType

us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:AllowanceForCreditLoss


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value3.4647472.4512932.7466472.7145332.9174242.663477
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


Operating Margin
us-gaap:StatementBusinessSegments
(None,)
Operating  Marginus-gaap: Statement Business Segments
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:ComprehensiveIncomeNetOfTax
us-gaap:StatementEquityComponents
(None,)
Comprehensive Income Net Of Taxus-gaap: Statement Equity Components
us-gaap:OperatingIncomeLoss
us-gaap:StatementBusinessSegments
(None,)
Operating Income Lossus-gaap: Statement Business Segments
us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents
(None,)
Other Comprehensive Income Loss Net Of Taxus-gaap: Statement Equity Components
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:StatementBusinessSegments
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
(None, 'gntx:AutomotiveSegment')
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service, us-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementGeographical
(None, 'country:US')
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service, us-gaap: Statement Geographical
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementGeographical
('gntx:AutomotiveProducts', None)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service, us-gaap: Statement Geographical
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementGeographical
(None, 'country:US')
Revenue From Contract With Customer Including Assessed Taxus-gaap: Product Or Service, us-gaap: Statement Geographical
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementGeographical
('gntx:AutomotiveProducts', None)
Revenue From Contract With Customer Including Assessed Taxus-gaap: Product Or Service, us-gaap: Statement Geographical
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
(None, 'gntx:AutomotiveSegment')
Revenue From Contract With Customer Including Assessed Taxus-gaap: Product Or Service, us-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
(None, 'gntx:OtherSegment')
Revenue From Contract With Customer Including Assessed Taxus-gaap: Product Or Service, us-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:StatementBusinessSegments
(None,)
Revenue From Contract With Customer Including Assessed Taxus-gaap: Statement Business Segments
us-gaap:Assets
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Assetsus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:BusinessAcquisition, us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
(None, 'us-gaap:InProcessResearchAndDevelopment')
Indefinite Lived Intangible Assets Excluding Goodwillus-gaap: Business Acquisition, us-gaap: Indefinite Lived Intangible Assets By Major Class
us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
('gntx:HomeLink', None)
Finite Lived Intangible Assets Netus-gaap: Business Acquisition, us-gaap: Finite Lived Intangible Assets By Major Class
us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
(None,)
Finite Lived Intangible Assets Netus-gaap: Finite Lived Intangible Assets By Major Class
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents
(None,)
Stock Issued During Period Value New Issuesus-gaap: Statement Equity Components