CWST


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

Table of contents


us-gaap:StatementClassOfStock
us-gaap:CommonStockValue
us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesIssued
us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesOutstanding
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted
us-gaap:AwardType
us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:PlanName

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostsAndExpenses

us-gaap:GeneralAndAdministrativeExpense

us-gaap:IncomeLossFromContinuingOperations

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

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

us-gaap:IncomeTaxesPaidNet

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

us-gaap:InterestPaidNet

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

us-gaap:NonoperatingIncomeExpense

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

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ProfitLoss

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

us-gaap:Revenues
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:InitialApplicationPeriodCumulativeEffectTransition
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService

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

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:OtherAssetsCurrent
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet

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

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:DeferredTaxAssetsLiabilitiesNet
us-gaap:IncomeTaxAuthority

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:DebtAndCapitalLeaseObligations
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:AmortizationOfFinancingCosts

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DepreciationDepletionAndAmortization
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:NetCashProvidedByUsedInOperatingActivities

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

us-gaap:ProfitLoss

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsValuationAllowance

cwst:AccountsReceivableAllowanceForCreditLossWriteoffRecoveries
us-gaap:EnvironmentalRemediationSite
cwst:AccrualForEnvironmentalLossContingenciesObligationsIncurred
us-gaap:AwardType, us-gaap:StatementClassOfStock
cwst:AdditionalSharesIssuedMaximumAttainmentLevel

cwst:BusinessAcquisitionsProFormaOperatingIncomeLoss

cwst:ExpenseFromAcquisitionActivities

cwst:IncreaseDecreaseInLandfillOperatingLeaseContractExpenditures

cwst:NonCashExpenseFromAcquisitionActivities

cwst:OtherComprehensiveIncomeLossCashFlowHedgeGainLossChangeInFairValueBeforeReclassificationAndTax

cwst:OtherComprehensiveIncomeLossCashFlowHedgeGainLossSettlementsBeforeReclassificationAndTax

cwst:SouthbridgeLandfillClosureCharge
us-gaap:EnvironmentalRemediationSite

cwst:SouthbridgeLandfillNonCashClosureCharge

us-gaap:AccretionExpenseIncludingAssetRetirementObligations
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesPayments1
us-gaap:EnvironmentalRemediationSite
us-gaap:AdjustmentForAmortization

us-gaap:AssetRetirementObligationAccretionExpense

us-gaap:AssetRetirementObligationLiabilitiesIncurred

us-gaap:AssetRetirementObligationLiabilitiesSettled

us-gaap:AssetRetirementObligationRevisionOfEstimate

us-gaap:BusinessAcquisitionProFormaEarningsPerShareBasic

us-gaap:BusinessAcquisitionProFormaEarningsPerShareDiluted

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss

us-gaap:BusinessAcquisitionsProFormaRevenue
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred
us-gaap:EnvironmentalRemediationSite
us-gaap:EnvironmentalCostsRecognizedRecoveryCreditedToExpense

us-gaap:FairValueOfAssetsAcquired

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeasePrincipalPayments

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:GoodwillAcquiredDuringPeriod
us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestIncomeOther

us-gaap:LeaseCost
us-gaap:EnvironmentalRemediationSite
us-gaap:LegalFees
dei:LegalEntity, us-gaap:LitigationCase, us-gaap:EnvironmentalRemediationSite
us-gaap:LitigationSettlementAmountAwardedToOtherParty
us-gaap:EnvironmentalRemediationSite
us-gaap:LitigationCase
us-gaap:LitigationCase, us-gaap:EnvironmentalRemediationSite
us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent

us-gaap:OperatingLeaseCost
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OperatingLeaseExpense
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired
us-gaap:BusinessAcquisition
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:ProceedsFromHedgeInvestingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProvisionForDoubtfulAccounts
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:RepaymentsOfLongTermDebtAndCapitalSecurities

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType
us-gaap:SaleOfStockConsiderationReceivedOnTransaction
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType, us-gaap:StatementClassOfStock
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
us-gaap:AwardType, us-gaap:StatementClassOfStock
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShortTermLeaseCost
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:ValuationAllowanceDeferredTaxAssetChangeInAmount

us-gaap:VariableLeaseCost

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

us-gaap:WeightedAverageNumberOfSharesRestrictedStock
us-gaap:Range, us-gaap:MeasurementInputType
cwst:AssetRetirementObligationMeasurementInput

cwst:FinanceLeaseLiabilityToBePaidAfterYearFour

cwst:FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour

cwst:LesseeOperatingLeaseLiabilityToBePaidAfterYearFour
us-gaap:AwardType
cwst:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedAggregateIntrinsicValue
us-gaap:AwardType
cwst:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsUnvestedWeightedAverageGrantDateFairValue
us-gaap:StatementClassOfStock
dei:EntityCommonStockSharesOutstanding

us-gaap:AccountsPayableRelatedPartiesCurrent

us-gaap:AccrualForEnvironmentalLossContingencies
us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesDiscount
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesDiscountRate

us-gaap:AccrualForEnvironmentalLossContingenciesGross

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear

us-gaap:AccruedCappingClosurePostClosureAndEnvironmentalCosts

us-gaap:AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AssetRetirementObligation
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet

us-gaap:ContractWithCustomerAssetGrossCurrent
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentCarryingAmount
us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentFairValue
us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:DebtWeightedAverageInterestRate

us-gaap:DeferredFinanceCostsNet
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsDerivativeInstruments

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards
us-gaap:BusinessAcquisition
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration

us-gaap:DeferredTaxAssetsOther
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeAssets
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeAverageFixedInterestRate
us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:Range, us-gaap:CreditFacility, us-gaap:VariableRate
us-gaap:DerivativeBasisSpreadOnVariableRate
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeLiabilityFairValueGrossAsset
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeNotionalAmount

us-gaap:EmployeeRelatedLiabilitiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
us-gaap:Range, us-gaap:AwardType

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:IncomeTaxesReceivable

us-gaap:InterestPayableCurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:InterestRateDerivativeLiabilitiesAtFairValue

us-gaap:InventoryGross

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LettersOfCreditOutstandingAmount
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:LitigationCase, us-gaap:EnvironmentalRemediationSite
us-gaap:LossContingencyAccrualAtCarryingValue
us-gaap:LitigationCase
us-gaap:LossContingencyEstimateOfPossibleLoss

us-gaap:MultiemployerPlansWithdrawalObligation

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:PrepaidExpenseCurrent

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization
us-gaap:ProductOrService
us-gaap:ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
us-gaap:StatementBusinessSegments

us-gaap:RestrictedCashAndInvestmentsNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:SelfInsuranceReserve
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType, us-gaap:Vesting
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:AwardType, us-gaap:Vesting
us-gaap:PlanName, us-gaap:StatementClassOfStock
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
us-gaap:StatementClassOfStock

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
us-gaap:AwardType, us-gaap:Vesting

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued

Plots across concepts


IncomeStatement
Comprehensive Income Net Of Tax
Expenses
Other Nonoperating Income Expense
Balance Sheet
Finite Lived Intangible Assets Net
Assets
Operating Lease Right Of Use Asset
Current Assets
Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Contract With Customer Liability Current
Noncurrent Liabilities
Deferred Income Tax Liabilities Net
Stockholders Equity
Retained Earnings Accumulated Deficit
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Gain Loss On Sale Of Property Plant Equipment
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
OperatingLeaseLiability
Operating Lease Liability Current
NonoperatingIncomeExpense
Nonoperating Income Expense
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Remainder Of Fiscal Year
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Accumulated Amortization
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA███▆▆▆▆▆▆▅▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁0.5040.5040.5010.4740.4740.4730.4680.4680.4660.4630.4190.4190.4180.4170.4130.4110.410.4090.4060.4050.4050.4020.4010.40.3990.3960.3960.395NA0.395NA0.391NA0.390.390.3890.3870.3870.380.2640.260.260.2590.2590.256NANANA
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock us-gaap:CommonClassA███▆▆▆▆▆▆▅▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁50.39850.37450.10147.38447.38247.3246.80346.79246.59946.25241.94441.93241.76541.741.29841.05541.04240.89240.57240.540.540.24340.06439.97839.92739.58839.58739.545NA39.451NA39.086NA39.04939.01138.94438.66238.65837.9526.36725.99125.98725.94925.89825.589NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonClassA███▇▇▇▇▇▇▇▆▆▆▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▁▁▁▁▁▁50.39850.37450.10147.38447.38247.3246.80346.79246.59946.25241.94441.93241.76541.741.29841.05541.04240.89240.57240.540.540.24340.06439.97839.92739.58839.58739.54539.45239.45139.4539.08639.05339.04939.01138.94438.66238.65837.9526.36725.99125.98725.94925.89825.589NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock,us-gaap:StatementEquityComponents us-gaap:CommonClassA,us-gaap:CommonStock███████▇▇▇▇▇▇▇▇▇▇▇▇▇▁50.39850.37450.10147.38447.38247.3246.80346.79246.59946.25241.94441.93241.76541.741.29841.05541.04240.89240.57240.50.0405NA0.040064NANANA39.587NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock,us-gaap:StatementEquityComponents us-gaap:CommonClassB,us-gaap:CommonStock████████████████████▁0.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.000988NA0.000988NANANA0.988NANANANANANANANANANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ██▇▆▆▆▆▆▆▃▃▃▃▂▃▃▂▂▂▂▂▁▁▂▁▁51.54651.38750.71948.61948.56348.26248.58348.36148.22142.91342.93644.17543.91642.3743.39443.29541.81141.58441.42242.28741.59840.99640.88941.28340.84640.417NA40.54240.581NA39.995NANANA39.821NANANANANANA26.82226.759NANA26.11526.788NA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ██▇▆▆▆▆▆▆▅▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁51.36651.17950.43648.3748.34848.00547.81147.6947.46445.91342.93642.77942.66142.3742.03341.95141.81141.58441.42241.37741.13240.99640.88940.8140.44740.417NA40.32640.313NA39.995NANANA39.821NANANANANANA26.82226.759NANA26.11526.058NA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount NA0.088NANA0.0120.0NA0.0020.01.422NA0.00.02.105NA0.02.5862.683NA0.3220.4732.445NA0.6650.7932.705NA1.231.212.1012.003NANA2.2722.3322.273NA1.9982.1262.601NA2.5763.0993.134NANANANA
us-gaap:EarningsPerShareBasic ▅▅█▅▅▅▅▅▅▄▄▆▅▄▆▅▁▅▄▅▅▄▄▅▅▄▄▅▅▅▄0.230.081.250.310.250.020.190.260.25-0.04-0.320.520.04-0.090.480.29-1.28-0.01-0.290.180.13-0.19-0.170.060.03-0.23-0.150.010.03-0.01-0.17NANANA-0.01NANANANANA-1.83-0.92-0.03-0.12NANA-0.04NA
us-gaap:EarningsPerShareDiluted ▅▅█▅▅▅▅▅▅▄▄▆▅▄▆▅▁▅▄▅▅▄▄▅▅▄▄▅▅▅▄0.230.081.240.310.250.020.190.260.25-0.04-0.320.50.04-0.090.460.28-1.28-0.01-0.290.180.12-0.19-0.170.060.03-0.23-0.150.010.03-0.01-0.17NANANA-0.01NA-0.34-0.29-0.68-0.31-1.83-0.92-0.03-0.121.85-0.24-0.04-0.11
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cwst:EasternRegion█▅▇▇▆▅▆█▇▄▅▆▆▃▄▄▃▁▃▄▃▁▃▃61.05852.34558.48258.32353.33650.14355.72759.67557.07646.99752.37456.00653.58944.50546.84449.06646.57438.68644.90947.23845.40538.98744.23446.143NANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cwst:ResourceSolutionsRegion█▆▅▅▄▄▃▃▂▁55.96551.42350.98749.61648.14547.56145.87145.58144.63542.516NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cwst:WesternRegion█▆▇▇▆▆▇▇▆▄▅▄▄▃▃▃▃▁▂▃▂▁▂▂98.85285.76490.77194.72887.28685.20691.53992.87185.35673.63476.05474.42571.04364.73964.26467.99264.37254.14458.07563.17159.4652.46258.52262.387NANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
 TTM Greenblatt ROC _ _▇▆▇▇▇▆▇▇▇▆▅█▇▅▆▇▁▆▆▇▇▆▆▇▆▆▆▆▆▆▅▅▅▅▆▆▆▅▆▆▂▆▆▆▅21.94612.00914.20820.63317.4447.01214.60418.48515.5444.442-5.13828.88415.1490.8389.85518.277-47.2796.5649.99717.37815.5961.9744.70212.69611.3423.1262.70810.06410.6239.338-0.473-5.973-3.674-1.2989.459.7372.11-0.0524.3745.751-37.6794.4211.62610.256-2.324NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits█▁3.0442.884NA1.8981.7631.515NA1.8581.8351.391.9382.0071.9461.931.4691.6841.4411.0580.810.5850.7290.550.5290.706NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:PlanName cwst:AmendedAndRestatedNineteenNinetySevenEmployeeStockPurchasePlan█▁0.0720.057NA0.0670.0560.047NA0.040.0540.041NA0.0340.0480.023NA0.0310.0370.028NA0.0280.0260.026NA0.0240.021NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▅▅█▅▅▄▅▅▅▄▃▅▄▄▅▅▁▄▃▅▄▄▄▄▄▄▄▄▄▄▄▃▃▄▄▄▃▃▃▄▁▃▄▄11.5488.14166.03915.27710.544-6.239.59611.6398.956-3.271-16.2722.9391.619-3.34220.45612.115-53.875-0.242-11.9997.5275.239-7.691-6.9942.2521.028-9.305-3.4750.2531.086-0.278-6.649-11.813-13.426-9.915-0.419-0.316-13.368-11.28-17.716-10.416-49.023-26.523-1.189-3.181NANANANA
us-gaap:CostOfGoodsAndServicesSold █▆▇▇▆▇▇▇▇▅▆▅▄▃▃▃▃▂▂▃▂▁▂▃▃▁138.553127.139133.26130.406123.462128.518130.949131.273128.674117.759121.764114.118111.8105.61104.227103.897102.51994.54497.56498.80395.18890.41896.3999.65698.73787.833NA98.29298.22898.76697.21888.02786.40487.60290.54588.41968.59784.16885.47484.81177.50681.39886.62785.22479.9276.93379.31381.339
us-gaap:CostsAndExpenses ▇▆▇▆▆▆▆▆▆▅▆▃▄▄▃▃█▂▃▃▂▂▃▃▃▁193.929177.523186.032182.034171.323175.898179.016180.062171.915159.222179.862143.948150.5146.617141.368141.992201.295127.238133.796133.755129.074123.458135.322133.489132.372113.451NA131.277131.301132.049137.752124.9116.871119.15122.846118.82196.457115.054115.961115.444147.007110.158118.24116.937112.197105.338110.629109.337
us-gaap:GeneralAndAdministrativeExpense █▇▇▆▆▅▆▄▄▄▄▃▃▃▃▃▂▂▃▂▂▂▃▁▂▁29.21227.13128.1725.01424.87424.35225.35922.53622.14522.74222.42620.54520.79321.02720.85520.7518.79418.84519.90618.77718.08418.58720.56817.44818.07116.805NA16.58217.21116.8415.59415.00116.38715.36116.42515.07814.41714.4813.98515.32414.57313.93316.06216.20717.56414.83215.69615.916
us-gaap:IncomeLossFromContinuingOperations ▅▄█▅▅▄▅▅▅▄▃▆▄▄▅▅▁▄11.7834.31162.91715.11712.1130.9599.06612.38611.915-1.714-13.67622.3021.704-3.9120.02112.08-53.675-0.224NANANANANANANANANA0.259NA-0.29NA-11.814NA-10.75-0.294-0.142-8.915-11.407-20.967-8.371-49.125-24.635-0.844-3.708NANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▇▇▇▇▇▆▇▇▇▆▅█▆▅▆▇▁▆▅▇▆▅▅▆▆▅17.2266.7439.27315.49112.471.0688.9112.5649.99-1.685-12.89422.6791.749-5.4984.20712.231-53.281-0.208-11.8247.85.422-7.763-6.782.4571.261-7.367NA0.5831.4690.136-9.85-15.109-13.307-10.377-0.230.205-7.664-16.437-20.679-7.729-49.28-24.034-0.777-3.047-21.939-5.2940.458-1.147
us-gaap:IncomeTaxExpenseBenefit ██▁▇▇▇▇▇▇▇▇▇▇▇▅▇▇▇▇▇▇▇▇▇▇▇5.4432.432-53.6440.3740.3570.109-0.1560.178-1.9250.0290.7820.3770.045-1.588-15.8140.1510.3940.0160.150.2630.23-0.1490.2390.1980.3180.596NA0.2220.2290.290.5280.5240.3030.6560.30.3191.373-4.9630.4130.65-0.1490.6010.0670.661-26.3561.0790.2810.779
us-gaap:IncomeTaxesPaidNet ███▁█▇▁▇▇▇▇▇▇▇▇▇█▇▇▇█▇█▇▇▇0.1730.2380.116-1.8370.1030.084-1.7150.068-0.0350.0510.0210.00.0480.036-0.1020.0590.1350.0540.0320.0390.1020.1010.251-0.0240.0250.03NA0.0140.0250.061-0.497-0.1170.50.027-0.0980.72-0.350.0260.097-0.026-0.2660.0333.1222.1591.3380.0250.0520.065
us-gaap:InterestExpense ▁▁▁▁▁▂▂▂▂▃▃▃▃▃▂▂▂▃▇▇██████5.2965.4685.5025.4065.5115.9526.2536.2356.1556.466.9476.4246.4696.4546.1086.2686.3346.459.2659.64310.00410.0310.05710.08710.1510.126NA9.6239.5249.5519.5889.6139.6069.5689.6359.3598.6129.40711.69911.85211.64411.52811.2111.15910.83911.66311.6311.779
us-gaap:InterestPaidNet ▂▃▃▂▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄█▁█▁█▁█4.6815.024.8784.5065.3615.3725.9835.5285.9545.7186.5735.5275.8765.5475.6125.3386.0348.0458.98915.3292.27216.1221.86816.3011.72715.336NA15.57114.9441.8682.59215.65614.9591.92915.6751.90214.4154.35511.18711.3919.29111.4219.34211.18912.16710.7810.42110.923
us-gaap:NetIncomeLoss ▅▄█▅▅▄▅▅▅▄▃▆▄▄▅▅▁▄▄▅▅▄▄▄▄▄▄▄▄▄▄▄▃▄▄▄▃▄▃▄▁▃▄▄▇▄▄▄11.7834.31162.91715.11712.1130.9599.06612.38611.915-1.714-13.67622.3021.704-3.9120.02112.08-53.675-0.224-11.9737.5375.195-7.608-7.0192.2961.025-9.271-5.9870.2591.08-0.29-6.655-11.815-13.423-10.75-0.339-0.191-13.397-11.407-20.967-8.371-49.124-24.635-0.765-3.06248.849-6.365-1.154-2.902
us-gaap:NonoperatingIncomeExpense █████▇███▇▇▇▄▇█▇▇▇▁▆▆▆▅▆▆▆-4.72-5.266-4.935-5.142-4.974-5.944-5.694-5.921-5.554-6.127-7.756-6.205-13.4-6.336-5.647-6.046-6.002-6.772-21.822-9.578-10.174-9.737-11.482-10.239-10.081-10.493NA-9.481-9.154-9.202-9.377-9.136-9.633-9.079-9.68-9.532-10.011-16.385-25.053-13.48-11.451-28.454-12.403-13.303-19.291-11.583-11.808-13.802
us-gaap:OperatingIncomeLoss ▇▆▇▇▇▆▇▇▇▆▅█▇▅▆▇▁▆▆▇▇▆▆▇▆▆▆▆▆▆▅▅▅▅▆▆▆▅▆▆▂▆▆▆▅▆▆▇21.94612.00914.20820.63317.4447.01214.60418.48515.5444.442-5.13828.88415.1490.8389.85518.277-47.2796.5649.99717.37815.5961.9744.70212.69611.3423.1262.70810.06410.6239.338-0.473-5.973-3.674-1.2989.459.7372.11-0.0524.3745.751-37.6794.4211.62610.256-2.3246.28912.26612.655
us-gaap:OtherNonoperatingIncomeExpense █▁0.510.138NA0.1570.492-0.043NA0.2480.4960.216NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA0.105NANANA0.094
us-gaap:ProfitLoss NANANA15.11712.1130.9599.06612.38611.915-1.714-13.67622.3021.704-3.9120.0212.08-53.675-0.224-11.9737.5375.192-7.614-7.022.2590.943-7.963-6.0170.3611.24-0.154-10.378-15.633-13.61-11.033-0.575-0.163-13.518-11.474-21.092-8.379-49.13-24.635-0.765-3.062NANANA-2.902
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▇▇▇▇▆▇▇▆▅▆▆▅▄▅▅▅▄▄▅▄▃▄▄▄▃▁▄▄▄▄▃▂▃▄▃▂▃▃▃▂▃▃▃▂▂▃▃215.875189.532200.24202.667188.767182.91193.619198.547187.459163.664174.724172.832165.649147.455151.222160.269154.016133.802143.795151.133144.67125.432140.024146.185143.714116.57785.646141.341141.924141.387137.279118.927113.197117.852132.296128.558108.694115.002120.335121.195106.375114.578129.866127.193106.772111.627122.895121.992
us-gaap:Revenues █▇▇▇▇▆▇▇▆▅▆▆▅▄▅▅▅▄▄▅▄▃▄▄▄▃▁▄▄▄▄▃▂▃▄▃▂▃▃▃▂▃▃▃▂▂▃▃215.875189.532200.24202.667188.767182.91193.619198.547187.459163.664174.724172.832165.649147.455151.222160.269154.016133.802143.795151.133144.67125.432140.024146.185143.714116.57785.646141.341141.924141.387137.279118.927113.197117.852132.296128.558108.694115.002120.335121.195106.375114.578129.866127.193106.772111.627122.895121.992
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
us-gaap:Assets ███▅▅▅▅▅▄▄▃▂▂▁▁▁▁▁▁▂▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▂▂▂1227.8331194.2461193.898994.255966.971957.64932.182935.78865.96828.313732.41702.848652.574631.375614.949592.42588.877621.249631.512635.255631.621620.406649.883660.665657.528654.404669.795661.794661.522656.602657.425649.897660.438669.442678.513674.744659.627673.153669.475643.274633.743674.369697.94694.872690.581NANANA
us-gaap:LiabilitiesAndStockholdersEquity ███▅▅▅▅▅▄▄▃▂▂▁▁▁▁▁▁▂▁▁▂▂▂▂▂▂1227.8331194.2461193.898994.255966.971957.64932.182935.78865.96828.313732.41702.848652.574631.375614.949592.42588.877621.249631.512635.255631.621620.406649.883660.665657.528654.404669.795661.794NA656.602NA649.897NA669.442678.513674.744659.627673.153669.475643.274633.743674.369697.94694.872690.581NANANA
us-gaap:StockholdersEquity ███▄▄▄▄▄▄▃▂▂▂▂▂▁▁▂▂▂▂▂▂▂▂▂▂▂388.492373.336362.142147.987130.745117.996122.753110.81296.19783.034-15.832-5.279-34.716-38.817-37.862-60.501-74.633-23.153-24.526-13.883-22.165-28.495-21.523-15.483-18.814-20.902-12.253-6.924NA-7.777NA-8.407NA2.72611.87311.65711.28524.24732.0797.04316.43164.91691.325NA93.987NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
us-gaap:AssetsCurrent █▇▇▃▂▃▂▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▂▁▁▁▁269.255239.506247.254115.74798.079119.554102.813113.791105.386109.15397.093101.87596.87584.91784.3884.53182.65372.73578.58883.08478.58970.73276.66885.75684.83673.02978.66981.644NA78.905NA70.805NA71.61776.44173.83161.05369.81394.02972.55267.35664.79576.4778.02572.405NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue █▇▇▂▁▂▁▁▁▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁167.177152.555154.34221.1273.07326.2213.4715.0283.15719.9364.0073.0832.0922.3921.9952.3032.6852.2262.5443.5612.3821.6482.3122.0193.1583.0572.2052.7343.0582.5953.6262.4642.9622.7124.9532.9191.7551.1121.9013.5054.5341.1314.4212.9041.8175.5314.0442.295
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents █▇▇▂▁▂▁▁▁▂▁167.177152.555154.34221.1273.07326.2213.4715.0283.15719.9364.007NANANA1.995NANANA2.544NANANA3.659NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▆▄▅▅▅▅▆█▇▅▅▆▆▄▄▃▃▂▃▃▃▁▂▃▃▁▂▂78.92866.32674.19873.60473.773.50980.20589.88285.44172.24374.93781.00378.9266.28765.95365.08365.76655.62761.19663.35561.08353.03460.16763.83563.50952.51355.7559.303NA59.212NA52.603NA50.3354.27554.27748.68950.42550.97853.43247.47248.03256.98462.46154.914NANANA
us-gaap:OtherAssetsCurrent ▂▂▂▂▂▂▂▁▁▁▃▃▂▂▂▂▁▂▂▂▂▂▃▆▆▆█▇1.4211.4091.3281.4331.2341.0881.2130.6930.6990.9872.0082.0971.3541.1231.0771.0110.9671.0751.291.3721.351.4951.5863.8433.5413.4074.8524.287NA1.314NA1.255NA1.8441.0091.0180.9010.8540.6420.5730.6090.6060.5340.4920.681NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType cwst:LandfillsNANA635.144NANANA578.814NANANA544.663NANANA513.548NANANA570.464NANANA536.577NANANA513.851NANANANA496.515NANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType cwst:RollingStockNANA204.333NANANA183.145NANANA163.758NANANA138.102NANANA133.84NANANA139.557NANANA138.201NANANANA128.155NANANANA128.038NANANA125.033NANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:BuildingAndBuildingImprovementsNANA169.325NANANA161.316NANANA150.885NANANA140.155NANANA143.036NANANA140.046NANANA139.461NANANANA134.787NANANANA133.33NANANA121.344NANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:ContainersNANA154.744NANANA143.948NANANA123.383NANANA103.501NANANA97.744NANANA94.302NANANA90.231NANANANA85.397NANANANA80.447NANANA73.416NANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LandNANA30.061NANANA28.703NANANA25.49NANANA24.224NANANA24.517NANANA24.161NANANA21.671NANANANA21.445NANANANA20.722NANANA21.1NANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:MachineryAndEquipmentNANA178.104NANANA168.735NANANA153.222NANANA139.029NANANA132.748NANANA131.384NANANA127.359NANANANA117.193NANANANA120.314NANANA116.091NANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment █▇▇▆▆▆▅▄▄▃▆▆▅▄▄▃▃▅▅▄▄▃▃▃▂▂▁▁936.029916.529900.882890.386879.09862.783844.874831.95817.367802.527878.701862.212845.156828.434811.474798.612783.128850.962837.122823.284812.737802.815789.766776.806762.442748.496736.839729.254NA713.611NA695.935NA684.168671.883656.257645.567636.868622.989608.041593.206667.776654.17639.203624.044NANANA
us-gaap:AmortizationOfIntangibleAssets ▇▇███▇█▆▅▅▅▂▁▁▁▁▁▁▁▁▁▁▁▁▂▂2.0152.0282.3132.2652.2222.0932.2621.9161.6391.4011.4680.7140.5670.5680.5430.5260.5050.4870.5370.5610.5190.5240.590.5950.6320.749NA0.7370.7370.7360.7410.7520.7520.6950.5860.5220.5550.3530.2070.190.1690.1560.1510.153NANANANA
us-gaap:PropertyPlantAndEquipmentNet ██▇▆▆▅▅▄▃▂▃▂▂▂▁▁▁▃▃▃▃▃▃▃▃▃▃▃532.824523.316510.512492.022480.388454.8443.825434.081406.636379.372404.577387.246378.782366.817361.547351.502349.345393.744398.466397.491398.747397.107402.252397.378399.022404.453414.542406.304NA403.306NA403.424NA420.769422.407424.772422.502428.452424.839422.096416.717461.904461.359454.789453.361NANANA
us-gaap:Goodwill ████▇▇▇▇▆▅▅▄▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁196.686196.316194.901192.379190.966186.626185.819184.295169.866162.734162.734151.029130.317130.317122.605122.085121.7119.936119.899119.899119.899118.976118.976118.976118.976119.17119.17119.17NA119.139NA119.139NA119.064118.257115.928115.928116.281102.722102.516101.706101.773101.329101.329101.204NANANA
us-gaap:FiniteLivedIntangibleAssetsNet ▇███████▆▄▅▄▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂55.92757.58158.32459.3960.40857.94358.72160.98343.34733.36634.76726.6019.71510.2828.1497.9968.1697.4727.6968.2328.4258.7289.2529.84210.43811.0711.80812.312NA12.733NA13.42NA14.17212.4311.15211.67411.9794.2173.4872.973.1392.4682.6192.455NANANA
us-gaap:DeferredTaxAssetsLiabilitiesNet NANA60.251NANANA5.934NANANA7.075NANANA9.262NANANANANANANANANANANA-4.985NANANANA-4.452NANANANA-3.068NANANA-1.624NANANANANANANA
 us-gaap:DeferredTaxAssetsLiabilitiesNet us-gaap:IncomeTaxAuthority us-gaap:DomesticCountryNANA61.163NANANA8.577NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▂▃▅▇██90.70792.53795.31101.433104.759107.133108.025NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▃▂▂▂▁▁▁▁▃▂▁▂▂▂▂▂▂▂▂▂▁▁▇███▆▆16.13114.12413.32213.01112.18611.65111.55211.51215.13714.67511.13312.51112.79614.53513.14812.88913.61213.9913.52813.28511.86611.65928.15129.31529.17329.69624.54223.539NA23.687NA24.205NA24.8327.33127.40727.52626.15821.90420.24721.06719.88420.28520.58421.262NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
us-gaap:AccountsPayableCurrent ▇▄▄▆▆▅█▇▇▄▆▆▅▄▃▃▂▁▃▃▃▁▃▄▄▁▄▃60.06450.54749.19855.82557.44353.82264.39659.3761.73149.38557.28956.20754.62349.60347.08147.04343.53940.51244.99747.29746.03738.80944.92150.10648.14739.4148.51847.376NA47.372NA51.788NA41.99949.54252.25251.97447.69551.32648.72946.70945.25251.75845.06342.499NANANA
us-gaap:ContractWithCustomerLiabilityCurrent ██▆▆█▇▄▆▅▄█▆▃▅▁3.1333.0822.6852.7543.0562.862.2992.8122.6442.3153.0742.6742.1152.5671.823NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent █▆▇▇▆▅▇▆▆▄▅▅▃▂▃▃▂▁▂▂▂▁▃▂▃▁▃▂147.558123.075131.208137.549128.956115.153130.589126.959120.007107.081111.497108.97795.74384.60988.56985.97678.04469.48182.42680.85384.63470.38585.34680.89786.05968.13386.43282.156NA90.475NA89.746NA85.65689.5897.77388.09898.591168.37490.29288.33584.1994.42986.71383.921NANANA
us-gaap:OperatingLeaseLiabilityCurrent ▁▁▅▄▅▆█7.2077.1228.5478.0788.4178.8299.356NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent █▆▇█▇▅▄▆▄▄▄▅▄▂▂▃▃▂▁▂▂▂▂▂▂▁▂▂35.66329.72431.86235.82732.4327.17923.59830.64125.18623.53123.81928.14822.49617.06219.25119.93620.59716.57214.91616.8317.12118.6617.76516.88416.62916.216.66718.672NA20.0NA17.612NA19.86522.71321.99121.01427.5923.58222.79621.20820.18623.15524.35420.923NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
us-gaap:DebtAndCapitalLeaseObligations ▇▇▇▇▆█▄▆▂▁▇▅▄▄▂▂▄▄▅▄549.171550.22548.419549.057543.067562.01522.728536.772496.741487.802555.249528.211515.992514.46497.68500.302519.158524.85525.583515.299NANA523.647531.745528.29546.899535.711523.778NANANA508.019NANANANA496.205NANANANANANANANANANANA
us-gaap:LongTermDebtAndCapitalLeaseObligations ▆▆▆▆▆█▄▆▂▁▇▅▄▃▁▁▃▄▄▃▄▅▆▆▆█▇▆526.83531.105530.411531.129527.757547.729509.021523.975483.892474.733542.001514.707502.094494.934477.576478.424497.592503.743503.961499.039501.804513.22522.199530.439526.853545.442534.055522.042NA511.192NA507.134NA509.759507.159496.988493.531490.686412.051487.501473.381470.837461.915465.731461.418NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▁▁▁▃▃▃▃▃▃▃▃▃▃▃▃██▇█0.9330.9220.9122.8582.5762.182.6432.6372.6572.5852.5192.4842.3842.3732.3056.5626.4626.1046.178NANANA5.595NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▅▅▇██▇▆▆▅▅▅▃▄▄▃▃▄▂▂▂▂▂▂▁▁▁▁▁30.04331.2635.98141.35140.33739.19234.76335.39532.09230.91530.78322.86525.7326.06825.10625.09425.60820.20119.95818.85918.618.07318.03116.30416.23716.12816.62716.76NA16.749NA17.258NA18.11717.117.10118.4511.75312.19912.36911.9211.6449.0758.8188.816NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▂▂▅▇█▇59.53660.85460.97967.36570.20871.72970.709NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA9.6649.52NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA7.4357.317NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA7.512NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA47.57NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
us-gaap:StockholdersEquity ███▄▄▄▄▄▄▃▂▂▂▂▂▁▁▂▂▂▂▂▂▂▂▂▂▂388.492373.336362.142147.987130.745117.996122.753110.81296.19783.034-15.832-5.279-34.716-38.817-37.862-60.501-74.633-23.153-24.526-13.883-22.165-28.495-21.523-15.483-18.814-20.902-12.253-6.924NA-7.777NA-8.407NA2.72611.87311.65711.28524.24732.0797.04316.43164.91691.325NA93.987NANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA███▆▆▆▆▆▆▅▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁0.5040.5040.5010.4740.4740.4730.4680.4680.4660.4630.4190.4190.4180.4170.4130.4110.410.4090.4060.4050.4050.4020.4010.40.3990.3960.3960.395NA0.395NA0.391NA0.390.390.3890.3870.3870.380.2640.260.260.2590.2590.256NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ███▄▄▄▄▄▄▄▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁645.905642.297639.247491.158489.193486.989485.332482.987480.013475.809373.716367.999361.502359.021356.638354.457352.441350.046348.434347.079346.324345.236344.518343.565342.487341.429340.773340.129NA339.529NA338.625NA337.946337.178336.543335.857335.451332.008289.372288.348287.81287.696286.995285.992NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▅▄▄▄▃▃▂▃▃▂▂▂▁▁▃▃▄▃▃▃▄▄▄▄▄-250.005-261.788-266.099-329.016-344.133-356.246-357.016-366.082-378.468-390.383-388.669-374.993-397.295-398.999-395.107-415.128-427.208-373.532-373.308-361.334-368.872-374.067-366.459-359.441-361.737-362.761-353.49-347.503NA-347.762NA-347.472NA-335.658-324.908-324.568-324.377-310.982-299.573-278.606-270.235-221.11-196.475-195.711-192.649NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▄▄▂▁▁▂▅▅▅▆▇████▇▇▇▇▇▇▇▇▇▇▇▇▇-7.922-7.687-11.517-14.639-14.799-13.23-6.041-6.571-5.824-2.865-1.3081.2860.6490.7340.184-0.251-0.286-0.086-0.068-0.043-0.032-0.0760.007-0.0170.0270.0240.0580.045NA0.051NA0.039NA0.038-0.797-0.717-0.592-0.619-0.746-3.997-1.952-2.054-0.1650.2590.378NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue █▁3.1162.941NA1.9651.8181.562NA1.8981.8891.4312.0792.1682.1212.0771.6481.8721.6551.2571.0160.7550.90.7220.7540.890.7750.66NA0.647NA0.562NA0.553NA0.6420.5780.631NANA0.6310.675NANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▅▅██▃▇▆▆▁▅▇▆▃▅▆▅▂▄▄▆▁▅46.86632.14728.00749.42247.70214.79145.33433.24433.4744.77730.91741.83835.28512.79428.43839.09129.33310.67624.36320.48633.8611.72429.977NANANANANANANANANANANANANANANANANANANANA13.94NANANA11.363
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▆▅▆▄▆▆▁▃▇▃▃▆▆▆▇▇█▇▇▇█▇-29.87-31.277-37.812-30.759-46.517-24.944-28.842-74.637-54.575-19.408-54.281-52.057-29.816-28.043-26.398-20.012-20.038-9.999-19.31-15.348-18.317-9.989-21.307NANANANANANANANANANANANANANANANANANANANA-17.892NANANA-7.815
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▂█▂▁▃▁▄▂▃▃▂▂▃▂▁▂▂▂▂▁▂▂-2.374-2.657143.02-0.609-24.33332.903-18.04943.2644.32230.5624.28811.21-5.76915.646-2.348-19.461-8.836-0.995-6.07-3.959-14.817.601-8.377NANANANANANANANANANANANANANANANANANANANA4.393NANANA-4.385
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▃▂█▃▁▃▂▂▁▃14.622-1.787133.21518.054-23.14822.75-1.5571.871-16.77915.929NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
us-gaap:AmortizationOfFinancingCosts ▄▄0.5720.572NA0.5430.5270.527NA0.5750.5740.575NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredIncomeTaxExpenseBenefit ██▁▇▇█▇▇▇▇██▇▇▆▇▇▇▇▇▇▇▇▇▇▇4.7412.3-53.8020.2580.2890.9670.0230.298-2.1370.1881.1710.8040.462-1.187-15.9090.10.358-0.0740.0550.2250.2030.10.1680.2110.465-0.049NA0.1550.1650.2240.4930.4910.2430.5840.2440.260.514-4.9640.3420.5650.3510.540.0690.939-25.4420.6420.5260.659
us-gaap:DepreciationDepletionAndAmortization █▇▇█▇▆▆▆▅▃▄▄▃▂▂▃▂▁▂▃▂▁▃▃▃▁24.33722.68223.50123.79922.07621.40621.64620.9419.71517.48918.93618.20217.38615.98315.79516.59115.86813.84915.42616.17515.80214.45316.3316.38516.24113.748NA16.02815.78716.36817.16715.07813.60814.39615.66915.19713.14314.04514.63214.75614.18214.82715.06114.50613.48513.57315.6215.584
us-gaap:IncreaseDecreaseInAccountsPayable ▇▅▂▄▅▁▆▄█▂▅▅▆▅▄▅▅▃▄▅▇▂▃▅▇▁9.5171.349-6.641-1.6183.621-10.5885.128-2.36111.899-7.9041.0821.5845.021.4050.0383.5043.027-4.485-2.31.267.228-6.112-5.1851.9598.737-9.108NA0.0045.476-4.4165.8279.789-2.953-7.543-2.710.2784.262-4.7272.5972.021.457-6.5066.6952.5647.64-3.4192.810.412
us-gaap:IncreaseDecreaseInAccountsReceivable █▂▄▄▄▂▁▆█▃▂▄█▄▄▄▇▂▃▅▇▂▃▄▇▃12.584-7.8720.5850.0480.059-6.507-9.6775.08412.751-2.694-6.3280.82312.58-1.2420.777-0.68310.139-5.569-2.1592.2728.049-7.133-3.5810.32610.911-3.237NA0.0912.1046.6099.8672.283-3.764-4.6470.1945.588-1.683-1.962-2.4545.96-0.56-8.952-5.4777.5477.04-7.2820.2663.249
us-gaap:NetCashProvidedByUsedInOperatingActivities █▅▅██▃▇▆▆▁▅▇▆▃▅▆▅▂▄▄▆▁▅46.86632.14728.00749.42247.70214.79145.33433.24433.4744.77730.91741.83835.28512.79428.43839.09129.33310.67624.36320.48633.8611.72429.977NANANANANANANANANANANANANANANANANANANANA13.94NANANA11.363
us-gaap:NetIncomeLoss ▅▄█▅▅▄▅▅▅▄▃▆▄▄▅▅▁▄▄▅▅▄▄▄▄▄▄▄▄▄▄▄▃▄▄▄▃▄▃▄▁▃▄▄▇▄▄▄11.7834.31162.91715.11712.1130.9599.06612.38611.915-1.714-13.67622.3021.704-3.9120.02112.08-53.675-0.224-11.9737.5375.195-7.608-7.0192.2961.025-9.271-5.9870.2591.08-0.29-6.655-11.815-13.423-10.75-0.339-0.191-13.397-11.407-20.967-8.371-49.124-24.635-0.765-3.06248.849-6.365-1.154-2.902
us-gaap:ProfitLoss NANANA15.11712.1130.9599.06612.38611.915-1.714-13.67622.3021.704-3.9120.0212.08-53.675-0.224-11.9737.5375.192-7.614-7.022.2590.943-7.963-6.0170.3611.24-0.154-10.378-15.633-13.61-11.033-0.575-0.163-13.518-11.474-21.092-8.379-49.13-24.635-0.765-3.062NANANA-2.902
us-gaap:ShareBasedCompensation ██▇▅▄▄▅▅▅▃▅▅▅▅▄▄▄▃▂▁▂▁▁▂▁▁3.1162.9412.8741.9651.8181.5622.0051.8981.8891.4312.0792.1682.1212.0771.6481.8721.6551.2571.0160.7550.90.7220.7540.890.7750.66NA0.6470.6270.5620.5370.5530.5760.6420.5780.6310.6760.5340.6310.6750.548-0.0590.7170.649-0.460.7050.780.567
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▆▅▆▄▆▆▁▃▇▃▃▆▆▆▇▇█▇▇▇█▇-29.87-31.277-37.812-30.759-46.517-24.944-28.842-74.637-54.575-19.408-54.281-52.057-29.816-28.043-26.398-20.012-20.038-9.999-19.31-15.348-18.317-9.989-21.307NANANANANANANANANANANANANANANANANANANANA-17.892NANANA-7.815
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▇▇█▆█▅▇▇▇▅▅▄▇▂▅▅▄▂▄▃▃▂▅▄▃▁29.23726.83230.83725.70131.71919.85127.16729.33928.41618.24321.39116.34927.5727.9221.16318.85815.7388.63416.76513.97513.6129.84818.95714.72711.8674.444NA18.66719.70916.88115.828NA7.477NA12.65213.407NANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▂█▂▁▃▁▄▂▃▃▂▂▃▂▁▂▂▂▂▁▂▂-2.374-2.657143.02-0.609-24.33332.903-18.04943.2644.32230.5624.28811.21-5.76915.646-2.348-19.461-8.836-0.995-6.07-3.959-14.817.601-8.377NANANANANANANANANANANANANANANANANANANANA4.393NANANA-4.385
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value504000.0504000.0501000.0474000.0474000.0473000.0468000.0468000.0466000.0463000.0419000.0419000.0418000.0417000.0413000.0411000.0410000.0409000.0406000.0405000.0405000.0402000.0401000.0400000.0399000.0396000.0396000.0395000.0395000.0391000.0390000.0390000.0389000.0387000.0387000.0380000.0264000.0260000.0260000.0259000.0259000.0256000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesIssued

us-gaap:CommonClassA


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302010-04-302009-04-30
Value5050504747474646464641414141414141404040404040393939393939393939383838372625252525252424
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonClassA


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302010-04-30
Value50505047474746464646414141414141414040404040403939393939393939393939393838383726252525252524
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value50505047474746464646414141414141414040400.04050.04006439
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.10.1100.0

us-gaap:CommonClassB, us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value0.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.9880.0009880.0009880.988
Percentage of CommonStockSharesOutstanding2.02.02.02.12.12.12.12.12.12.12.42.42.42.42.42.42.42.42.42.40.00.02.5

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-06-302013-10-312012-01-312011-10-312011-01-312010-10-31
Value51515048484848484842424443424343414141424140404140404040393926262626
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-06-302013-10-312012-01-312011-10-312011-01-312010-10-31
Value51515048484847474745424242424241414141414140404040404040393926262626
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 End2021-03-312020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-01-312013-10-312013-07-312013-01-312012-10-312012-07-312012-01-312011-10-312011-07-31
Value88000.012000.002000.001422000.0002105000.002586000.02683000.0322000.0473000.02445000.0665000.0793000.02705000.01230000.01210000.02101000.02003000.02272000.02332000.02273000.01998000.02126000.02601000.02576000.03099000.03134000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.00.0100.00.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302013-10-312012-04-302012-01-312011-10-312011-07-312010-10-31
Value0.230.081.250.310.250.020.190.260.25-0.04-0.320.520.04-0.090.480.29-1.28-0.01-0.290.180.13-0.19-0.170.060.03-0.23-0.150.010.03-0.01-0.17-0.01-1.83-0.92-0.03-0.12-0.04
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302013-10-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value0.230.081.240.310.250.020.190.260.25-0.04-0.320.50.04-0.090.460.28-1.28-0.01-0.290.180.12-0.19-0.170.060.03-0.23-0.150.010.03-0.01-0.17-0.01-0.34-0.29-0.68-0.31-1.83-0.92-0.03-0.121.85-0.24-0.04-0.11
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

us-gaap:AllocatedShareBasedCompensationExpense

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits


Allocated
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value3044000.02884000.01898000.01763000.01515000.01858000.01835000.01390000.01938000.02007000.01946000.01930000.01469000.01684000.01441000.01058000.0810000.0585000.0729000.0550000.0529000.0706000.0
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.50.90.90.80.91.00.81.11.21.21.31.01.10.90.80.60.40.50.40.40.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:PlanName

cwst:AmendedAndRestatedNineteenNinetySevenEmployeeStockPurchasePlan


Allocated
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value72000.057000.067000.056000.047000.040000.054000.041000.034000.048000.023000.031000.037000.028000.028000.026000.026000.024000.021000.0
Percentage of AllocatedShareBasedCompensationExpense2.42.03.53.23.12.22.92.91.72.51.21.82.62.64.83.64.73.40.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:AmendedAndRestatedNineteenNinetySevenEmployeeStockPurchasePlan0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-31
Value118.141661510-6.239.596118.956-3.271-16.27221.619-3.3422012-53.875-0.242-11.9997.5275.239-7.691-6.9942.2521.028-9.305-3.4750.2531.086-0.278-6.649-11.813-13.426-9.915-0.419-0.316-13.368-11.28-17.716-10.416-49.023-26.523-1.189-3.181
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.34.333.07.55.6-3.45.05.94.8-2.0-9.313.31.0-2.313.57.6-35.0-0.2-8.35.03.6-6.1-5.01.50.7-8.00.00.20.8-0.2-4.8-9.9-11.9-8.4-0.3-0.2-12.3-9.8-14.7-8.6-46.1-23.1-0.9-2.5

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value138127133130123128130131128117121114111105104103102949798959096999887989898978886879088688485847781868579767981
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax64.267.166.664.365.470.367.666.168.672.069.766.067.571.668.964.866.670.767.865.465.872.168.868.268.775.369.569.269.970.874.076.374.368.468.863.173.271.070.072.971.066.767.074.968.964.566.7

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value19317718618217117517918017115917914315014614114120112713313312912313513313211313113113213712411611912211896115115115147110118116112105110109
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax89.893.792.989.890.896.292.590.791.797.3102.983.390.999.493.588.6130.795.193.088.589.298.496.691.392.197.392.992.593.4100.3105.0103.2101.192.992.488.7100.096.495.3138.296.191.091.9105.194.490.089.6

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value2927282524242522222222202021202018181918181820171816161716151516151615141413151413161617141515
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.514.314.112.313.213.313.111.411.813.912.811.912.614.313.812.912.214.113.812.412.514.814.711.912.614.411.712.111.911.412.614.513.012.411.713.312.611.612.613.712.212.412.716.513.312.813.0

Income Loss From Continuing Operations

us-gaap:IncomeLossFromContinuingOperations

us-gaap:IncomeLossFromContinuingOperations


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-31
Value114.3116215120.9599.0661211-1.714-13.676221.704-3.912012-53.675-0.2240.259-0.29-11.814-10.75-0.294-0.142-8.915-11.407-20.967-8.371-49.125-24.635-0.844-3.708
Percentage of IncomeLossFromContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.52.331.47.56.40.54.76.26.4-1.0-7.812.91.0-2.713.27.5-34.9-0.20.2-0.2-9.9-9.1-0.2-0.1-8.2-9.9-17.4-6.9-46.2-21.5-0.6-2.9

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value176.7439.27315121.0688.91129.99-1.685-12.894221.749-5.4984.20712-53.281-0.208-11.8247.85.422-7.763-6.782.4571.261-7.3670.5831.4690.136-9.85-15.109-13.307-10.377-0.230.205-7.664-16.437-20.679-7.729-49.28-24.034-0.777-3.047-21.939-5.2940.458-1.147
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.03.64.67.66.60.64.66.35.3-1.0-7.413.11.1-3.72.87.6-34.6-0.2-8.25.23.7-6.2-4.81.70.9-6.30.41.00.1-7.2-12.7-11.8-8.8-0.20.2-7.1-14.3-17.2-6.4-46.3-21.0-0.6-2.4-20.5-4.70.4-0.9

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:InterestRateSwap, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value1.1560.990.4890.3370.1470.0440.025-0.610.156-0.038-0.053-0.101-0.112-0.138-0.0690.00.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest7.57.945.83.81.20.4-1.54.70.7-2.21.0-2.4-0.90.333.2-0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.50.30.20.10.00.0-0.30.1-0.0-0.0-0.1-0.1-0.1-0.10.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:InterestRateSwap us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value-1.202-1.145-0.99-0.367
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-7.0-17.0-7.9-34.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.6-0.6-0.5-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value5443000.02432000.0-53644000.0374000.0357000.0109000.0-156000.0178000.0-1925000.029000.0782000.0377000.045000.0-1588000.0-15814000.0151000.0394000.016000.0150000.0263000.0230000.0-149000.0239000.0198000.0318000.0596000.0222000.0229000.0290000.0528000.0524000.0303000.0656000.0300000.0319000.01373000.0-4963000.0413000.0650000.0-149000.0601000.067000.0661000.0-26356000.01079000.0281000.0779000.0
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.51.3-26.80.20.20.1-0.10.1-1.00.00.40.20.0-1.1-10.50.10.30.00.10.20.2-0.10.20.10.20.50.20.20.20.40.40.30.60.20.21.3-4.30.30.5-0.10.50.10.5-24.71.00.20.6

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value-142000.0-127000.00112000.0
Percentage of IncomeTaxExpenseBenefit-2.6-5.20.0102.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.10.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value173000.0238000.0116000.0-1837000.0103000.084000.0-1715000.068000.0-35000.051000.021000.0048000.036000.0-102000.059000.0135000.054000.032000.039000.0102000.0101000.0251000.0-24000.025000.030000.014000.025000.061000.0-497000.0-117000.0500000.027000.0-98000.0720000.0-350000.026000.097000.0-26000.0-266000.033000.03122000.02159000.01338000.025000.052000.065000.0
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.1-0.90.10.0-0.90.0-0.00.00.00.00.00.0-0.10.00.10.00.00.00.10.10.2-0.00.00.00.00.00.0-0.4-0.10.40.0-0.10.6-0.30.00.1-0.0-0.30.02.41.71.30.00.00.1

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value5.2965.4685.5025.4065.5115.9526.2536.2356.1556.466.9476.4246.4696.4546.1086.2686.3346.459.2659.6431010101010109.6239.5249.5519.5889.6139.6069.5689.6359.3598.6129.40711111111111110111111
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.52.92.72.72.93.33.23.13.33.94.03.73.94.44.03.94.14.86.46.46.98.07.26.97.18.76.86.76.87.08.18.58.17.37.37.98.29.79.810.910.18.68.810.210.49.59.7

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

us-gaap:InterestRateSwap, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Interest
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.2021.1450.990.367
Percentage of InterestExpense22.720.918.06.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.60.50.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:InterestRateSwap us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.0

us-gaap:InterestRateSwap, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Interest
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value1.1560.990.489-0.7690.1470.0440.0250.1160.1560.0380.0530.1010.1120.1380.0690.00.0
Percentage of InterestExpense21.418.08.2-12.32.40.70.41.72.40.60.81.71.82.21.10.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.50.3-0.40.10.00.00.10.10.00.00.10.10.10.10.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:InterestRateSwap us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value4.6815.024.8784.5065.3615.3725.9835.5285.9545.7186.5735.5275.8765.5475.6125.3386.0348.0458.989152.272161.868161.7271515141.8682.59215141.929151.902144.35511119.291119.3421112101010
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.62.42.22.82.93.12.83.23.53.83.23.53.83.73.33.96.06.310.11.612.91.311.21.213.211.010.51.31.913.213.21.611.81.513.33.89.39.48.710.07.28.811.49.78.59.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value114.3116215120.9599.0661211-1.714-13.676221.704-3.912012-53.675-0.224-11.9737.5375.195-7.608-7.0192.2961.025-9.271-5.9870.2591.08-0.29-6.655-11.815-13.423-10.75-0.339-0.191-13.397-11.407-20.967-8.371-49.124-24.635-0.765-3.06248-6.365-1.154-2.902
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.52.331.47.56.40.54.76.26.4-1.0-7.812.91.0-2.713.27.5-34.9-0.2-8.35.03.6-6.1-5.01.60.7-8.0-7.00.20.8-0.2-4.8-9.9-11.9-9.1-0.3-0.1-12.3-9.9-17.4-6.9-46.2-21.5-0.6-2.445.8-5.7-0.9-2.4

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

us-gaap:InterestRateSwap, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.1560.990.6010.3370.1470.0440.025-0.610.156-0.0380.156-0.7410.112-0.138-0.069
Percentage of NetIncomeLoss7.68.262.73.71.20.4-1.54.50.7-2.2-4.0-3.70.90.330.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.50.30.20.10.00.0-0.30.1-0.00.1-0.50.1-0.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:InterestRateSwap us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value-1.06-1.018-0.99-0.479
Percentage of NetIncomeLoss-9.0-23.6-8.2-49.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.5-0.5-0.5-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value114.31115120.9591211-1.714-13.676221.704-3.91
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.52.37.56.40.56.26.4-1.0-7.812.91.0-2.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value-4.72-5.266-4.935-5.142-4.974-5.944-5.694-5.921-5.554-6.127-7.756-6.205-13.4-6.336-5.647-6.046-6.002-6.772-21.822-9.578-10.174-9.737-11.482-10.239-10.081-10.493-9.481-9.154-9.202-9.377-9.136-9.633-9.079-9.68-9.532-10.011-16.385-25.053-13.48-11.451-28.454-12.403-13.303-19.291-11.583-11.808-13.802
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.2-2.8-2.5-2.5-2.6-3.2-2.9-3.0-3.0-3.7-4.4-3.6-8.1-4.3-3.7-3.8-3.9-5.1-15.2-6.3-7.0-7.8-8.2-7.0-7.0-9.0-6.7-6.4-6.5-6.8-7.7-8.5-7.7-7.3-7.4-9.2-14.2-20.8-11.1-10.8-24.8-9.6-10.5-18.1-10.4-9.6-11.3

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value21121420177.0121418154.442-5.13828150.8389.85518-47.2796.5649.99717151.9744.70212113.1262.70810109.338-0.473-5.973-3.674-1.2989.459.7372.11-0.0524.3745.751-37.6794.421110-2.3246.2891212
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.26.37.110.29.23.87.59.38.32.7-2.916.79.10.66.511.4-30.74.97.011.510.81.63.48.77.92.73.27.17.56.6-0.3-5.0-3.2-1.17.17.61.9-0.03.64.7-35.43.99.08.1-2.25.610.010.4

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-0.386-0.454-0.592-0.598-0.586-0.608-1.87-1.02
Percentage of OperatingIncomeLoss-1.8-3.8-4.2-2.9-3.4-8.7-12.8-5.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.2-0.2-0.3-0.3-0.3-0.3-1.0-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.0

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

us-gaap:OperatingSegments, cwst:EasternRegion


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value3.7812.2452.6123.6834.3660.9753.7812.1214.227-0.626-13.14154.266-1.8122.545.897-60.3240.0212.9554.4523.079-0.7880.1144.523
Percentage of OperatingIncomeLoss17.218.718.417.925.013.925.911.527.2-14.1255.753.228.2-216.225.832.3127.60.329.625.619.7-39.92.435.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.81.21.31.82.30.52.01.12.3-0.4-7.58.92.6-1.21.73.7-39.20.02.12.92.1-0.60.13.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cwst:EasternRegion0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cwst:ResourceSolutionsRegion


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.6512.4622.3492.2041.8011.0031.5792.2231.6040.401
Percentage of OperatingIncomeLoss16.620.516.510.710.314.310.812.010.39.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.31.21.11.00.50.81.10.90.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cwst:ResourceSolutionsRegion0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cwst:WesternRegion


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value147.7569.83915115.6421115105.3568.20414117.1948.59711104.0896.01511102.9935.5647.792
Percentage of OperatingIncomeLoss67.964.669.274.468.080.575.681.966.5120.6-159.749.079.1858.587.263.4-22.862.360.265.665.2151.6118.361.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.94.14.97.66.33.15.77.65.53.34.78.27.24.95.77.27.03.14.27.57.02.44.05.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cwst:WesternRegion0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312011-07-312010-07-31
Value510000.0138000.0157000.0492000.0-43000.0248000.0496000.0216000.0105000.094000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.10.10.3-0.00.10.30.10.10.1

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312010-07-31
Value15120.9599.0661211-1.714-13.676221.704-3.912012-53.675-0.224-11.9737.5375.192-7.614-7.022.2590.943-7.963-6.0170.3611.24-0.154-10.378-15.633-13.61-11.033-0.575-0.163-13.518-11.474-21.092-8.379-49.13-24.635-0.765-3.062-2.902
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.56.40.54.76.26.4-1.0-7.812.91.0-2.713.27.5-34.9-0.2-8.35.03.6-6.1-5.01.50.7-6.8-7.00.30.9-0.1-7.6-13.1-12.0-9.4-0.4-0.1-12.4-10.0-17.5-6.9-46.2-21.5-0.6-2.4-2.4

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value21518920020218818219319818716317417216514715116015413314315114412514014614311685141141141137118113117132128108115120121106114129127106111122121
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

cwst:Collection


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
Value10797102104959599101938383807567
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax49.751.451.151.450.752.251.351.049.751.147.846.845.645.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax49.751.451.151.450.752.251.351.049.751.147.846.845.645.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Collection100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:CustomerSolutions


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value222220212120191819171515151514131413131313131313
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.211.010.711.811.110.410.311.111.09.99.610.310.69.79.510.39.89.29.310.49.69.29.411.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.211.010.711.811.110.410.311.111.09.99.610.310.69.79.510.39.89.29.310.49.69.29.411.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:CustomerSolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:LandfillGasToEnergy


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
Value1.11.3031.1410.9870.9181.0260.9210.8080.7111.1361.1140.921.2951.798
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.70.60.50.50.60.50.40.40.70.60.50.81.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.70.60.50.50.60.50.40.40.70.60.50.81.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:LandfillGasToEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:LandfillRevenue


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
Value2219222319192425241923272420
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.510.011.111.610.510.912.512.813.011.713.315.714.513.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.510.011.111.610.510.912.512.813.011.713.315.714.513.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:LandfillRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:NonProcessingServices


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value34343133
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.218.016.918.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.218.016.918.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:NonProcessingServices100.0100.0100.0100.0

cwst:Organics


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1414151413141413131314129.9349.662119.2141010128.9359.5159.753109.02
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.27.28.28.27.17.18.08.38.07.88.88.36.66.07.16.97.16.88.47.16.86.77.57.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.27.28.28.27.17.18.08.38.07.88.88.36.66.07.16.97.16.88.47.16.86.77.57.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Organics100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:ProcessingServices


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value23181814
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.89.99.68.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.89.99.68.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:ProcessingServices100.0100.0100.0100.0

cwst:RebateRecycledOrReturnedOrganicMaterials


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value-2.532-1.568-1.546-0.991
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.2-0.8-0.8-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.2-0.8-0.8-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:RebateRecycledOrReturnedOrganicMaterials100.0100.0100.0100.0

cwst:RecyclingRevenues


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value141312111111111112111111
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.26.56.86.15.75.66.16.86.96.86.77.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.26.56.86.15.75.66.16.86.96.86.77.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:RecyclingRevenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:Transfer


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
Value2316202120161921201417181813
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.98.710.410.710.88.810.011.110.98.79.910.611.38.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.98.710.410.710.88.810.011.110.98.79.910.611.38.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Transfer100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:Transportation


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
Value3.0872.2612.472.3483.4542.6713.6443.1293.2872.5634.1663.3124.3796.509
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.21.21.21.81.51.91.61.81.62.41.92.64.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.21.21.21.81.51.91.61.81.62.41.92.64.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Transportation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cwst:Collection, cwst:EasternRegion


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
Value3936394037363941383335363430
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.219.019.620.019.720.120.421.120.820.820.121.120.920.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.219.019.620.019.720.120.421.120.820.820.121.120.920.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Collection cwst:EasternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:Collection, cwst:WesternRegion


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
Value6761626358585959544948444036
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.532.431.431.431.032.131.029.928.930.327.725.724.724.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.532.431.431.431.032.131.029.928.930.327.725.724.724.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Collection cwst:WesternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:CustomerSolutions, cwst:ResourceSolutionsRegion


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2222202121201918
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.211.010.711.811.110.410.311.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.211.010.711.811.110.410.311.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:CustomerSolutions cwst:ResourceSolutionsRegion100.0100.0100.0100.0100.0100.0100.0100.0

cwst:LandfillGasToEnergy, cwst:EasternRegion


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
Value0.2460.2680.2220.210.1980.3850.2250.1420.1940.3290.3260.2720.3360.462
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.20.10.10.10.20.20.20.20.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.20.10.10.10.20.20.20.20.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:LandfillGasToEnergy cwst:EasternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:LandfillGasToEnergy, cwst:WesternRegion


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
Value0.8541.0350.9190.7770.720.6410.6960.6660.5170.8070.7880.6480.9591.336
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.50.50.40.40.40.40.30.30.50.50.40.60.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.50.50.40.40.40.40.30.30.50.50.40.60.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:LandfillGasToEnergy cwst:WesternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:LandfillRevenue, cwst:EasternRegion


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
Value6.1185.4036.8895.6944.5683.5444.8045.4145.4273.7176.248.3367.8835.96
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.82.93.42.82.41.92.52.72.92.33.64.84.84.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.82.93.42.82.41.92.52.72.92.33.64.84.84.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:LandfillRevenue cwst:EasternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:LandfillRevenue, cwst:WesternRegion


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
Value1613151715161920181517181614
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.77.27.78.88.18.910.010.110.19.59.810.99.89.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.77.27.78.88.18.910.010.110.19.59.810.99.89.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:LandfillRevenue cwst:WesternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:NonProcessingServices, cwst:ResourceSolutionsRegion


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value34343133
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.218.016.918.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.218.016.918.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:NonProcessingServices cwst:ResourceSolutionsRegion100.0100.0100.0100.0

cwst:Organics, cwst:ResourceSolutionsRegion


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1414151413141413
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.27.28.28.27.17.18.08.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.27.28.28.27.17.18.08.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Organics cwst:ResourceSolutionsRegion100.0100.0100.0100.0100.0100.0100.0100.0

cwst:ProcessingServices, cwst:EasternRegion


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.8081.1261.6050.846
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.60.90.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.60.90.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:ProcessingServices cwst:EasternRegion100.0100.0100.0100.0

cwst:ProcessingServices, cwst:ResourceSolutionsRegion


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value21171613
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.79.18.67.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.79.18.67.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:ProcessingServices cwst:ResourceSolutionsRegion100.0100.0100.0100.0

cwst:ProcessingServices, cwst:WesternRegion


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.5020.3580.3450.291
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:ProcessingServices cwst:WesternRegion100.0100.0100.0100.0

cwst:RecyclingRevenues, cwst:EasternRegion


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.004-0.0020.0040.0020.00.0040.5770.00.0050.0050.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.00.00.00.00.00.30.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.00.00.00.00.00.30.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:RecyclingRevenues cwst:EasternRegion100.0100.0100.0100.00.0100.0100.00.0100.0100.00.00.0

cwst:RecyclingRevenues, cwst:ResourceSolutionsRegion


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1412121010101010
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.06.36.66.05.65.45.66.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.06.36.66.05.65.45.66.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:RecyclingRevenues cwst:ResourceSolutionsRegion100.0100.0100.0100.0100.0100.0100.0100.0

cwst:RecyclingRevenues, cwst:WesternRegion


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.3080.3560.3320.2390.2430.4610.3410.4410.5530.8751.4450.948
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.10.10.20.20.30.30.50.90.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.10.10.20.20.30.30.50.90.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:RecyclingRevenues cwst:WesternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:Transfer, cwst:EasternRegion


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
Value139.4241211119.3831112118.9861011107.56
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.25.06.05.96.15.15.86.26.45.56.16.46.55.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.25.06.05.96.15.15.86.26.45.56.16.46.55.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Transfer cwst:EasternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:Transfer, cwst:WesternRegion


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
Value9.9767.1468.6889.7569.0166.7068.1599.6948.5975.2756.6857.298.0115.606
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.63.84.34.84.83.74.24.94.63.23.84.24.83.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.63.84.34.84.83.74.24.94.63.23.84.24.83.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Transfer cwst:WesternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:Transportation, cwst:EasternRegion


Revenue
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0470.0480.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Transportation cwst:EasternRegion100.0100.00.00.00.00.00.00.00.00.00.00.0

cwst:Transportation, cwst:WesternRegion


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
Value3.042.2132.472.3483.4542.6713.1612.7092.8952.0462.4912.3963.5595.824
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.21.21.21.81.51.61.41.51.31.41.42.13.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.21.21.21.81.51.61.41.51.31.41.42.13.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Transportation cwst:WesternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

cwst:EasternRegion


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
Value6152585853505559574652565344
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.327.629.228.828.327.428.830.130.428.730.032.432.430.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.327.629.228.828.327.428.830.130.428.730.032.432.430.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:EasternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:ResourceSolutionsRegion


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value55515049484745454442
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.927.125.524.525.526.023.723.023.826.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.927.125.524.525.526.023.723.023.826.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:ResourceSolutionsRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:WesternRegion


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
Value9885909487859192857376747164
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax45.845.345.346.746.246.647.346.845.545.043.543.142.943.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax45.845.345.346.746.246.647.346.845.545.043.543.142.943.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:WesternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments, us-gaap:TimingOfTransferOfGoodOrService

cwst:EasternRegion, us-gaap:TransferredAtPointInTime


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
Value0.0380.0440.0460.0520.0690.0560.0360.0360.0520.0360.1480.1280.1810.191
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:EasternRegion us-gaap:TransferredAtPointInTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:EasternRegion, us-gaap:TransferredOverTime


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
Value6152585853505559574652555344
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.327.629.228.828.227.428.830.030.428.729.932.332.230.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.327.629.228.828.227.428.830.030.428.729.932.332.230.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:EasternRegion us-gaap:TransferredOverTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:ResourceSolutionsRegion, us-gaap:TransferredAtPointInTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value14109.1937.7368.2314.4624.5615.7486.5056.391
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.95.34.63.84.42.42.42.93.53.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.95.34.63.84.42.42.42.93.53.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:ResourceSolutionsRegion us-gaap:TransferredAtPointInTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:ResourceSolutionsRegion, us-gaap:TransferredOverTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value41414141394341393836
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.021.820.920.721.123.621.320.120.322.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.021.820.920.721.123.621.320.120.322.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:ResourceSolutionsRegion us-gaap:TransferredOverTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:WesternRegion, us-gaap:TransferredAtPointInTime


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
Value0.4870.5010.5350.3470.3670.2350.2480.1860.1780.3090.2980.2330.2460.367
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.30.30.20.20.10.10.10.10.20.20.10.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.30.30.20.20.10.10.10.10.20.20.10.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:WesternRegion us-gaap:TransferredAtPointInTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:WesternRegion, us-gaap:TransferredOverTime


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
Value9885909486849192857375747064
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax45.645.045.146.646.046.547.146.745.444.843.442.942.743.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax45.645.045.146.646.046.547.146.745.444.843.442.942.743.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:WesternRegion us-gaap:TransferredOverTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TimingOfTransferOfGoodOrService

us-gaap:TransferredAtPointInTime


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
Value15109.7748.1358.6674.7534.8455.976.7356.7368.0978.9357.778.172
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.25.64.94.04.62.62.53.03.64.14.65.24.75.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.25.64.94.04.62.62.53.03.64.14.65.24.75.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TransferredAtPointInTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TransferredOverTime


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
Value200178190194180178188192180156166163157139
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax92.894.495.196.095.497.497.597.096.495.995.494.895.394.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax92.894.495.196.095.497.497.597.096.495.995.494.895.394.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TransferredOverTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value21518920020218818219319818716317417216514715116015413314315114412514014614311685141141141137118113117132128108115120121106114129127106111122121
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:InitialApplicationPeriodCumulativeEffectTransition

us-gaap:AccountingStandardsUpdate201409, us-gaap:DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1.018-1.546-0.991-0.954-1.027-1.109-1.338-1.547-1.6480.001616-1.468
Percentage of Revenues-0.5-0.8-0.5-0.5-0.5-0.6-0.8-0.9-1.00.0-1.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.5-0.8-0.5-0.5-0.5-0.6-0.8-0.9-1.00.0-1.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccountingStandardsUpdate201409 us-gaap:DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic6060.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302013-10-312013-07-312012-07-31
Value-50.971-43.011-46.093-48.759-45.305-40.279-43.623-45.005-31.959-30.287-25.299-113.8530.0-30.428-22.639-32.782-32.975-29.4-30.199-26.109
Percentage of Revenues-23.6-22.7-23.0-24.1-24.0-22.0-22.5-22.7-21.1-20.9-20.2-81.30.0-21.2-19.4-23.2-23.2-22.2-23.5-21.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-23.6-22.7-23.0-24.1-24.0-22.0-22.5-22.7-21.1-20.9-20.2-81.30.0-21.2-19.4-23.2-23.2-22.2-23.5-21.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:IntersegmentElimination, cwst:EasternRegion


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302017-09-302017-06-302016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-30
Value-16.128-12.426-13.166-14.261-13.837-11.839-14.132-15.156141312119.5361112118.01612
Percentage of Revenues-7.5-6.6-6.6-7.0-7.3-6.5-7.3-7.68.98.68.58.17.68.38.67.96.99.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.5-6.6-6.6-7.0-7.3-6.5-7.3-7.68.98.68.58.17.68.38.67.96.99.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination cwst:EasternRegion0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntersegmentElimination, cwst:ResourceSolutionsRegion


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-1.277-1.903-2.528-2.806-2.448-2.894-2.843-2.792
Percentage of Revenues-0.6-1.0-1.3-1.4-1.3-1.6-1.5-1.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.6-1.0-1.3-1.4-1.3-1.6-1.5-1.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination cwst:ResourceSolutionsRegion0.00.00.00.00.00.00.00.0

us-gaap:IntersegmentElimination, cwst:WesternRegion


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302017-09-302017-06-302016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-30
Value-33.566-28.682-30.399-31.692-29.02-25.546-26.648-27.05719181817141718181419
Percentage of Revenues-15.5-15.1-15.2-15.6-15.4-14.0-13.8-13.612.012.112.312.411.812.212.512.912.413.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15.5-15.1-15.2-15.6-15.4-14.0-13.8-13.612.012.112.312.411.812.212.512.912.413.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination cwst:WesternRegion0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cwst:EasternRegion


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-30
Value615258585350555957465256534446494638444745384446433342
Percentage of Revenues28.327.629.228.828.327.428.830.130.428.730.032.432.430.231.030.630.228.931.231.331.431.131.631.630.528.529.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.327.629.228.828.327.428.830.130.428.730.032.432.430.231.030.630.228.931.231.331.431.131.631.630.528.529.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cwst:EasternRegion0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cwst:ResourceSolutionsRegion


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value55515049484745454442
Percentage of Revenues25.927.125.524.525.526.023.723.023.826.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.927.125.524.525.526.023.723.023.826.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cwst:ResourceSolutionsRegion0.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cwst:WesternRegion


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-30
Value988590948785919285737674716464676454586359525862614960
Percentage of Revenues45.845.345.346.746.246.647.346.845.545.043.543.142.943.942.542.441.840.540.441.841.141.841.842.742.942.342.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax45.845.345.346.746.246.647.346.845.545.043.543.142.943.942.542.441.840.540.441.841.141.841.842.742.942.342.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cwst:WesternRegion0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ProductOrService

cwst:CustomerSolutions


Revenuesus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value222220212120191819171515151514131413131313131313
Percentage of Revenues11.211.010.711.811.110.410.311.111.09.99.610.310.69.79.510.39.89.29.310.49.69.29.411.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.211.010.711.811.110.410.311.111.09.99.610.310.69.79.510.39.89.29.310.49.69.29.411.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:CustomerSolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:Organics


Revenuesus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1414151413141413131314129.9349.662119.2141010128.9359.5159.753109.02
Percentage of Revenues7.27.28.28.27.17.18.08.38.07.88.88.36.66.07.16.97.16.88.47.16.86.77.57.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.27.28.28.27.17.18.08.38.07.88.88.36.66.07.16.97.16.88.47.16.86.77.57.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:Organics100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:RecyclingRevenues


Revenuesus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1412121010101010
Percentage of Revenues7.06.36.66.05.65.45.66.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.06.36.66.05.65.45.66.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:RecyclingRevenues97.897.397.497.897.895.892.096.1

cwst:ResourceSolutionsOperations


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value55515049484745454442
Percentage of Revenues25.927.125.524.525.526.023.723.023.826.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.927.125.524.525.526.023.723.023.826.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:ResourceSolutionsOperations0.00.00.00.00.00.00.00.00.00.0

cwst:ResourceSolutionsOperationsNonProcessing


Revenuesus-gaap:
Period End2021-06-302021-03-312020-06-302020-03-31
Value34343133
Percentage of Revenues16.218.016.918.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.218.016.918.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:ResourceSolutionsOperationsNonProcessing0.00.00.00.0

cwst:ResourceSolutionsOperationsProcessing


Revenuesus-gaap:
Period End2021-06-302021-03-312020-06-302020-03-31
Value21171613
Percentage of Revenues9.79.18.67.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.79.18.67.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:ResourceSolutionsOperationsProcessing0.00.00.00.0

cwst:SolidWasteOperations


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value159138149153140135147152142121130131125109112118112941041121069210511010784
Percentage of Revenues74.172.974.575.574.574.076.377.076.274.074.576.075.774.674.274.072.870.472.674.573.574.075.175.575.172.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax74.172.974.575.574.574.076.377.076.274.074.576.075.774.674.274.072.870.472.674.573.574.075.175.575.172.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:SolidWasteOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cwst:SolidWasteOperationsCollection


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1079710010294949798928382797466677066596265635760636053
Percentage of Revenues49.751.450.250.549.851.750.649.849.150.847.446.145.045.144.643.743.144.743.543.444.046.143.443.542.245.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax49.751.450.250.549.851.750.649.849.150.847.446.145.045.144.643.743.144.743.543.444.046.143.443.542.245.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:SolidWasteOperationsCollection0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cwst:SolidWasteOperationsDisposal


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value4937454743384750483644484740414442313943393241434427
Percentage of Revenues22.820.022.823.523.221.124.425.525.722.025.728.228.527.327.628.027.423.427.228.727.225.729.729.530.723.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.820.022.823.523.221.124.425.525.722.025.728.228.527.327.628.027.423.427.228.727.225.729.729.530.723.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:SolidWasteOperationsDisposal0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cwst:SolidWasteOperationsPowerGeneration


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.11.3031.1410.9870.9181.0260.9210.8080.7111.1361.1150.921.2951.7991.2541.2151.5541.3521.1441.611.461.7071.4911.6941.5642.047
Percentage of Revenues0.50.70.60.50.50.60.50.40.40.70.60.50.81.20.80.81.01.00.81.11.01.41.11.21.11.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.70.60.50.50.60.50.40.40.70.60.50.81.20.80.81.01.00.81.11.01.41.11.21.11.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:SolidWasteOperationsPowerGeneration0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cwst:SolidWasteOperationsProcessing


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.311.4841.9372.1941.951.1211.7492.641.9080.8781.3272.0792.3471.421.6982.4992.1371.661.5881.9741.7470.9731.4091.8661.6651.121
Percentage of Revenues1.10.81.01.11.00.60.91.31.00.50.81.21.41.01.11.61.41.21.11.31.20.81.01.31.21.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.10.81.01.11.00.60.91.31.00.50.81.21.41.01.11.61.41.21.11.31.20.81.01.31.21.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cwst:SolidWasteOperationsProcessing0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value122711941193994966957932935865828732702652631614592588621631635631620649660657654669661661656657649660669678674659673669643633674697694690
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value251237239533758353738
Percentage of Assets20.519.920.15.43.96.13.84.05.2
Percentage of Assets20.519.920.15.43.96.13.84.05.2
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OperatingSegments, cwst:EasternRegion


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-04-30
Value226221223215211206207209211195184180180174157155158197202206208209212210211200
Percentage of Assets18.418.518.721.721.921.522.222.324.523.625.225.727.627.725.626.326.831.832.132.533.033.732.831.831.530.8
Percentage of Assets18.418.518.721.721.921.522.222.324.523.625.225.727.627.725.626.326.831.832.132.533.033.732.831.831.530.8
Percentage of Assets us-gaap:OperatingSegments cwst:EasternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cwst:ResourceSolutionsRegion


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value9588888991939092888679
Percentage of Assets7.87.47.49.09.59.79.79.910.210.410.8
Percentage of Assets7.87.47.49.09.59.79.79.910.210.410.8
Percentage of Assets us-gaap:OperatingSegments cwst:ResourceSolutionsRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cwst:WesternRegion


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-04-30
Value654646642635626599598596530493428402354342344335328324327326319312318323333331
Percentage of Assets53.354.153.863.964.862.664.263.861.359.658.657.354.354.256.056.655.752.251.951.550.650.349.049.049.751.0
Percentage of Assets53.354.153.863.964.862.664.263.861.359.658.657.354.354.256.056.655.752.251.951.550.650.349.049.049.751.0
Percentage of Assets us-gaap:OperatingSegments cwst:WesternRegion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value122711941193994966957932935865828732702652631614592588621631635631620649660657654669661656649669678674659673669643633674697694690
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-04-30
Value3883733621471301171221109683-15.832-5.279-34.716-38.817-37.862-60.501-74.633-23.153-24.526-13.883-22.165-28.495-21.523-15.483-18.814-20.902-12.253-6.924-7.777-8.4072.72611111124327.04316649193
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets31.631.330.314.913.512.313.211.811.110.0-2.2-0.8-5.3-6.1-6.2-10.2-12.7-3.7-3.9-2.2-3.5-4.6-3.3-2.3-2.9-3.2-1.8-1.0-1.2-1.30.41.71.71.73.64.81.12.69.613.113.6

us-gaap:StockholdersEquity us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.5040.5040.5010.4740.4740.4730.4680.4680.4660.4630.4190.4190.4180.4170.413
Percentage of StockholdersEquity0.10.10.10.30.40.40.40.40.50.6-2.6-7.9-1.2-1.1-1.1
Percentage of Assets0.00.00.00.00.00.00.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-31
Value-7.922-7.687-11.517
Percentage of StockholdersEquity-2.0-2.1-3.2
Percentage of Assets-0.6-0.6-1.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-11.517-14.639-14.799-13.23-6.041-6.571-5.824-2.865-1.3081.2860.6490.7340.166
Percentage of StockholdersEquity-3.2-9.9-11.3-11.2-4.9-5.9-6.1-3.58.3-24.4-1.9-1.9-0.4
Percentage of Assets-1.0-1.5-1.5-1.4-0.6-0.7-0.7-0.3-0.20.20.10.10.0
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-7.922-7.687-11.517-14.639-14.799-13.23-6.041-6.571-5.824-2.865-1.3081.2860.6490.7340.184
Percentage of StockholdersEquity-2.0-2.1-3.2-9.9-11.3-11.2-4.9-5.9-6.1-3.58.3-24.4-1.9-1.9-0.5
Percentage of Assets-0.6-0.6-1.0-1.5-1.5-1.4-0.6-0.7-0.7-0.3-0.20.20.10.10.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value645642639491489486485482480475373367361359356
Percentage of StockholdersEquity166.3172.0176.5331.9374.2412.7395.4435.9499.0573.0-2360.5-6971.0-1041.3-924.9-941.9
Percentage of Assets52.653.853.549.450.650.952.151.655.457.451.052.455.456.958.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-250.005-261.788-266.099-329.016-344.133-356.246-357.016-366.082-378.468-390.383-388.669-374.993-397.295-398.999-395.107
Percentage of StockholdersEquity-64.4-70.1-73.5-222.3-263.2-301.9-290.8-330.4-393.4-470.12455.07103.51144.41027.91043.5
Percentage of Assets-20.4-21.9-22.3-33.1-35.6-37.2-38.3-39.1-43.7-47.1-53.1-53.4-60.9-63.2-64.3
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value2692392471159811910211310510997101968484848272788378707685847378817870717673616994726764767872
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.920.120.711.610.112.511.012.212.213.213.314.514.813.413.714.314.011.712.413.112.411.411.813.012.911.211.712.312.010.910.711.310.99.310.414.011.310.69.611.011.210.5

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-12-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-312010-04-302009-04-30
Value167152154213.073263.4715.0283.157194.0073.0832.0922.3921.9952.3032.6852.2262.5443.5612.3821.6482.3122.0193.1583.0572.2052.7343.0582.5953.6262.4642.9622.7122.6954.9532.9191.7551.1121.9013.5054.5341.1314.4212.9041.8175.5314.0442.2952.0351.838
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.612.812.92.10.32.70.40.50.42.40.50.40.30.40.30.40.50.40.40.60.40.30.40.30.50.50.30.40.50.40.60.40.40.40.00.70.40.30.20.30.50.70.20.60.40.30.00.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312015-12-31
Value167152154213.073263.4715.0283.157194.0071.9952.5443.659
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.612.812.92.10.32.70.40.50.42.40.50.30.40.6

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value786674737373808985727481786665656555616361536063635255595952505454485050534748566254
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.45.66.27.47.67.78.69.69.98.710.211.512.110.510.711.011.29.09.710.09.78.59.39.79.78.08.39.09.08.17.58.08.07.47.57.68.37.57.18.29.08.0

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value1421000.01409000.01328000.01433000.01234000.01088000.01213000.0693000.0699000.0987000.02008000.02097000.01354000.01123000.01077000.01011000.0967000.01075000.01290000.01372000.01350000.01495000.01586000.03843000.03541000.03407000.04852000.04287000.01314000.01255000.01844000.01009000.01018000.0901000.0854000.0642000.0573000.0609000.0606000.0534000.0492000.0681000.0
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.30.30.20.20.20.20.20.20.20.20.20.20.20.60.50.50.70.60.20.20.30.10.20.10.10.10.10.10.10.10.10.1

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentGross

cwst:Landfills


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-30
Value635578544513570536513496
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets53.262.174.483.590.382.676.776.4
Percentage of Assets cwst:Landfills0.00.00.00.00.00.00.00.0

cwst:RollingStock


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value204183163138133139138128128125
Percentage of PropertyPlantAndEquipmentGross32.231.630.126.923.526.026.925.80.00.0
Percentage of Assets17.119.622.422.521.221.520.619.719.419.7
Percentage of Assets cwst:RollingStock0.00.00.00.00.00.00.00.00.00.0

us-gaap:BuildingAndBuildingImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value169161150140143140139134133121
Percentage of PropertyPlantAndEquipmentGross26.727.927.727.325.126.127.127.10.00.0
Percentage of Assets14.217.320.622.822.621.520.820.720.219.1
Percentage of Assets us-gaap:BuildingAndBuildingImprovements0.00.00.00.00.00.00.00.00.00.0

us-gaap:Containers


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value154143123103979490858073
Percentage of PropertyPlantAndEquipmentGross24.424.922.720.217.117.617.617.20.00.0
Percentage of Assets13.015.416.816.815.514.513.513.112.211.6
Percentage of Assets us-gaap:Containers0.00.00.00.00.00.00.00.00.00.0

us-gaap:Land


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value30282524242421212021
Percentage of PropertyPlantAndEquipmentGross4.75.04.74.74.34.54.24.30.00.0
Percentage of Assets2.53.13.53.93.93.73.23.33.13.3
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.00.00.00.0

us-gaap:MachineryAndEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value178168153139132131127117120116
Percentage of PropertyPlantAndEquipmentGross28.029.228.127.123.324.524.823.60.00.0
Percentage of Assets14.918.120.922.621.020.219.018.018.218.3
Percentage of Assets us-gaap:MachineryAndEquipment0.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value936916900890879862844831817802878862845828811798783850837823812802789776762748736729713695684671656645636622608593667654639624
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets76.276.775.589.690.990.190.688.994.496.9120.0122.7129.5131.2132.0134.8133.0137.0132.6129.6128.7129.4121.5117.6116.0114.4110.0110.2108.7107.1102.299.097.397.994.693.194.593.699.093.792.090.4

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-31
Value2015000.02028000.02313000.02265000.02222000.02093000.02262000.01916000.01639000.01401000.01468000.0714000.0567000.0568000.0543000.0526000.0505000.0487000.0537000.0561000.0519000.0524000.0590000.0595000.0632000.0749000.0737000.0737000.0736000.0741000.0752000.0752000.0695000.0586000.0522000.0555000.0353000.0207000.0190000.0169000.0156000.0151000.0153000.0
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value532523510492480454443434406379404387378366361351349393398397398397402397399404414406403403420422424422428424422416461461454453
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets43.443.842.849.549.747.547.646.447.045.855.255.158.058.158.859.359.363.463.162.663.164.061.960.160.761.861.961.461.462.162.962.363.064.163.663.565.665.868.566.165.465.6

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value196196194192190186185184169162162151130130122122121119119119119118118118118119119119119119119118115115116102102101101101101101
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.016.416.319.319.719.519.919.719.619.622.221.520.020.619.920.620.719.319.018.919.019.218.318.018.118.217.818.018.118.317.817.417.217.617.315.315.916.015.114.514.614.7

us-gaap:Goodwill us-gaap:BusinessAcquisition

cwst:TransferStationsAcquisition


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value1.7571.3879.0826.565.1470.80725247.1320.040287.7127.7122.6882.1871.8010.0370.9230.9230.9230.00.00.0
Percentage of Goodwill0.90.74.73.42.70.413.813.14.20.024.718.85.95.92.21.81.50.00.80.80.80.00.00.0
Percentage of Assets0.10.10.80.70.50.12.82.60.80.05.54.01.21.20.40.40.30.00.10.10.10.00.00.0
Percentage of Assets cwst:TransferStationsAcquisition0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Goodwill us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cwst:EasternRegion


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-30
Value3030281917171717
Percentage of Goodwill15.816.517.315.714.514.614.614.6
Percentage of Assets2.63.33.83.12.82.72.62.7
Percentage of Assets us-gaap:OperatingSegments cwst:EasternRegion13.814.815.212.28.68.28.38.7

us-gaap:OperatingSegments, cwst:WesternRegion


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-30
Value1491411208988878787
Percentage of Goodwill77.075.974.172.973.873.573.673.6
Percentage of Assets12.615.116.514.514.013.513.113.5
Percentage of Assets us-gaap:OperatingSegments cwst:WesternRegion23.423.628.126.027.027.526.326.5

us-gaap:Goodwill us-gaap:StatementBusinessSegments

cwst:EasternRegion


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302014-12-312014-10-312014-04-302014-01-312013-10-312013-04-302013-01-312012-10-312012-07-312012-04-302011-04-30
Value30303030303030303028242525191919171717171717171717171616130.0580.0580.0580.038
Percentage of Goodwill15.715.715.816.016.116.516.516.718.117.316.419.319.315.715.715.814.514.514.514.514.614.614.614.614.614.614.414.511.50.10.10.10.0
Percentage of Assets2.52.62.63.13.23.23.33.33.53.83.53.94.03.13.23.32.82.82.72.82.72.62.62.62.72.62.52.62.00.00.00.00.0
Percentage of Assets cwst:EasternRegion0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.08.48.28.38.30.08.70.00.08.06.50.00.00.00.0

cwst:WesternRegion


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302014-12-312014-10-312014-04-302014-01-312013-10-312013-04-302013-01-312012-10-312012-07-312012-04-302011-04-30
Value15115114914714614114113912512011291918988888888888887878787878787869090908988
Percentage of Goodwill77.177.177.076.776.676.075.975.773.674.174.369.969.972.972.872.773.873.873.873.873.573.573.673.673.673.673.974.978.088.188.188.087.9
Percentage of Assets12.412.712.614.815.114.815.114.914.416.516.014.014.414.515.015.014.214.013.914.013.513.213.113.313.513.112.913.213.513.514.014.112.9
Percentage of Assets cwst:WesternRegion0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.027.727.527.026.30.026.50.00.024.925.025.525.626.826.5

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value5557585960575860433334269.715108.1497.9968.1697.4727.6968.2328.4258.7289.2529.84210111112121314121111114.2173.4872.973.1392.4682.6192.455
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.64.84.96.06.26.16.36.55.04.04.73.81.51.61.31.31.41.21.21.31.31.41.41.51.61.71.81.91.92.12.11.81.71.81.80.60.50.50.50.40.40.4

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerLists


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value4951515253505153352930247.7218.1156.9086.766.8556.3656.5046.9267.3477.7638.1848.6569.1299.6361010101112109.0489.4319.6182.7211.9181.693
Percentage of FiniteLivedIntangibleAssetsNet89.289.089.088.888.687.787.787.682.888.288.093.279.578.984.884.583.985.284.584.187.288.988.587.987.587.086.786.586.386.085.782.881.180.880.364.555.057.0
Percentage of Assets4.14.34.35.35.55.35.55.74.13.64.23.51.21.31.11.11.21.01.01.11.21.31.31.31.41.51.51.61.71.81.81.51.31.41.40.40.30.3
Percentage of Assets us-gaap:CustomerLists0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncompeteAgreements


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value6.0676.3586.4246.6436.8967.1027.1947.5877.4743.934.1661.8211.9942.1671.2411.2361.3141.1071.1921.3061.0780.9651.0681.1861.3091.4341.5661.6581.7481.8822.0212.1332.1042.2432.3611.4961.5691.277
Percentage of FiniteLivedIntangibleAssetsNet10.811.011.011.211.412.312.312.417.211.812.06.820.521.115.215.516.114.815.515.912.811.111.512.112.513.013.313.513.714.014.317.218.919.219.735.545.043.0
Percentage of Assets0.50.50.50.70.70.70.80.80.90.50.60.30.30.30.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.30.40.20.20.2
Percentage of Assets us-gaap:NoncompeteAgreements0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Deferred Tax Assets Liabilities Net

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:DeferredTaxAssetsLiabilitiesNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312014-04-302013-04-302012-04-30
Value605.9347.0759.262-4.985-4.452-3.068-1.624
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.00.61.01.5-0.7-0.7-0.5-0.3

us-gaap:DeferredTaxAssetsLiabilitiesNet us-gaap:IncomeTaxAuthority

us-gaap:DomesticCountry


Deferred
Period End2020-12-312019-12-31
Value618.577
Percentage of DeferredTaxAssetsLiabilitiesNet101.5144.5
Percentage of Assets5.10.9
Percentage of Assets us-gaap:DomesticCountry0.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value909295101104107108
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.47.78.010.210.811.211.6

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value161413131211111115141112121413121313131311112829292924232324242727272621202119202021
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.31.21.11.31.31.21.21.21.71.81.51.82.02.32.12.22.32.32.12.11.91.94.34.44.44.53.73.63.63.73.74.04.14.23.93.33.13.32.92.93.03.1

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value605049555753645961495756544947474340444746384450483948474751414952514751484645514542
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.94.24.15.65.95.66.96.37.16.07.88.08.47.97.77.97.46.57.17.47.36.36.97.67.36.07.27.27.28.06.37.37.77.97.17.77.67.46.77.46.56.2

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3133000.03082000.02685000.02754000.03056000.02860000.02299000.02812000.02644000.02315000.03074000.02674000.02115000.02567000.01823000.0
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.20.30.30.30.20.30.30.30.40.40.30.40.3

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value1471231311371281151301261201071111089584888578698280847085808668868290898589978898168908884948683
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.010.311.013.813.312.014.013.613.912.915.215.514.713.414.414.513.311.213.112.713.411.313.112.213.110.412.912.413.813.812.813.214.513.414.625.214.013.912.513.512.512.2

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value7207000.07122000.08547000.08078000.08417000.08829000.09356000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.70.80.90.91.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value352931353227233025232328221719192016141617181716161616182017192221212723222120232420
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.92.52.73.63.42.82.53.32.92.83.34.03.42.73.13.43.52.72.42.62.73.02.72.62.52.52.52.83.02.73.03.33.33.24.13.53.53.33.03.33.53.0

Debt And Capital Lease Obligations

us-gaap:DebtAndCapitalLeaseObligations

us-gaap:DebtAndCapitalLeaseObligations


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-04-302013-04-30
Value549550548549543562522536496487555528515514497500519524525515523531528546535523508496
Percentage of DebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets44.746.145.955.256.258.756.157.457.458.975.875.279.181.580.984.588.284.583.281.180.680.580.383.680.079.178.275.2

us-gaap:DebtAndCapitalLeaseObligations us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cwst:RevenueBondsSeries2020DueSeptember2050, us-gaap:UnsecuredDebt


Debt
Period End2020-09-30
Value40
Percentage of DebtAndCapitalLeaseObligations7.3
Percentage of Assets4.0
Percentage of Assets cwst:RevenueBondsSeries2020DueSeptember2050 us-gaap:UnsecuredDebt0.0

cwst:TermFacilityDueMay2023TermLoanBFacility, us-gaap:SecuredDebt


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value3503503503503503503503503503500.0
Percentage of DebtAndCapitalLeaseObligations63.764.462.367.065.270.571.863.066.367.80.0
Percentage of Assets35.236.236.537.537.440.442.347.849.853.60.0
Percentage of Assets cwst:TermFacilityDueMay2023TermLoanBFacility us-gaap:SecuredDebt0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtAndCapitalLeaseObligations us-gaap:LongtermDebtType

cwst:NotesPayable


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-04-302013-04-30
Value5.0125.1045.1815.4644.8624.4732.2982.4012.4772.4312.5222.5852.8822.9450.4070.4491.1431.1531.1671.1670.2470.2460.4180.4350.440.441.228
Percentage of DebtAndCapitalLeaseObligations0.90.90.91.00.90.90.50.40.50.50.50.50.60.60.10.10.20.00.00.20.00.00.10.10.10.10.2
Percentage of Assets0.50.50.50.60.50.50.30.30.40.40.40.40.50.50.10.10.20.20.20.20.00.00.10.10.10.10.2
Percentage of Assets cwst:NotesPayable0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value526531530531527547509523483474542514502494477478497503503499501513522530526545534522511507509507496493490412487473470461465461
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets42.944.544.453.454.657.254.656.055.957.374.073.276.978.477.780.884.581.179.878.679.482.780.480.380.183.379.778.977.978.076.174.773.774.872.961.575.874.769.866.267.066.8

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value933000.0922000.0912000.02858000.02576000.02180000.02643000.02637000.02657000.02585000.02519000.02484000.02384000.02373000.02305000.06562000.06462000.06104000.06178000.05595000.0
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.30.30.20.30.30.30.30.30.40.40.40.41.11.11.01.00.9

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value3031354140393435323030222526252525201918181818161616161616171817171811121211119.0758.8188.816
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.42.63.04.24.24.13.73.83.73.74.23.33.94.14.14.24.33.33.23.02.92.92.82.52.52.52.52.52.62.72.72.52.52.81.71.81.91.91.71.31.31.3

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value59606067707170
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.85.15.16.87.37.57.6

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-312020-09-30
Value9664000.09520000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0
Percentage of Assets0.81.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-312020-09-30
Value7435000.07317000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0
Percentage of Assets0.60.7

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value7512000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.6

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value47
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets4.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312020-09-30
Value6975
Percentage of OperatingLeaseLiability100.0100.0
Percentage of Assets5.87.6

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-312020-09-30
Value90102
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0
Percentage of Assets7.610.3

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-312020-09-30
Value2027
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0
Percentage of Assets1.82.7

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-04-30
Value3883733621471301171221109683-15.832-5.279-34.716-38.817-37.862-60.501-74.633-23.153-24.526-13.883-22.165-28.495-21.523-15.483-18.814-20.902-12.253-6.924-7.777-8.4072.72611111124327.04316649193
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets31.631.330.314.913.512.313.211.811.110.0-2.2-0.8-5.3-6.1-6.2-10.2-12.7-3.7-3.9-2.2-3.5-4.6-3.3-2.3-2.9-3.2-1.8-1.0-1.2-1.30.41.71.71.73.64.81.12.69.613.113.6

us-gaap:StockholdersEquity us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.5040.5040.5010.4740.4740.4730.4680.4680.4660.4630.4190.4190.4180.4170.413
Percentage of StockholdersEquity0.10.10.10.30.40.40.40.40.50.6-2.6-7.9-1.2-1.1-1.1
Percentage of Assets0.00.00.00.00.00.00.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-31
Value-7.922-7.687-11.517
Percentage of StockholdersEquity-2.0-2.1-3.2
Percentage of Assets-0.6-0.6-1.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-11.517-14.639-14.799-13.23-6.041-6.571-5.824-2.865-1.3081.2860.6490.7340.166
Percentage of StockholdersEquity-3.2-9.9-11.3-11.2-4.9-5.9-6.1-3.58.3-24.4-1.9-1.9-0.4
Percentage of Assets-1.0-1.5-1.5-1.4-0.6-0.7-0.7-0.3-0.20.20.10.10.0
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-7.922-7.687-11.517-14.639-14.799-13.23-6.041-6.571-5.824-2.865-1.3081.2860.6490.7340.184
Percentage of StockholdersEquity-2.0-2.1-3.2-9.9-11.3-11.2-4.9-5.9-6.1-3.58.3-24.4-1.9-1.9-0.5
Percentage of Assets-0.6-0.6-1.0-1.5-1.5-1.4-0.6-0.7-0.7-0.3-0.20.20.10.10.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value645642639491489486485482480475373367361359356
Percentage of StockholdersEquity166.3172.0176.5331.9374.2412.7395.4435.9499.0573.0-2360.5-6971.0-1041.3-924.9-941.9
Percentage of Assets52.653.853.549.450.650.952.151.655.457.451.052.455.456.958.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-250.005-261.788-266.099-329.016-344.133-356.246-357.016-366.082-378.468-390.383-388.669-374.993-397.295-398.999-395.107
Percentage of StockholdersEquity-64.4-70.1-73.5-222.3-263.2-301.9-290.8-330.4-393.4-470.12455.07103.51144.41027.91043.5
Percentage of Assets-20.4-21.9-22.3-33.1-35.6-37.2-38.3-39.1-43.7-47.1-53.1-53.4-60.9-63.2-64.3
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value504000.0504000.0501000.0474000.0474000.0473000.0468000.0468000.0466000.0463000.0419000.0419000.0418000.0417000.0413000.0411000.0410000.0409000.0406000.0405000.0405000.0402000.0401000.0400000.0399000.0396000.0396000.0395000.0395000.0391000.0390000.0390000.0389000.0387000.0387000.0380000.0264000.0260000.0260000.0259000.0259000.0256000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value645642639491489486485482480475373367361359356354352350348347346345344343342341340340339338337337336335335332289288287287286285
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets52.653.853.549.450.650.952.151.655.457.451.052.455.456.958.059.859.856.355.254.654.855.653.052.052.152.250.951.451.752.150.549.749.950.949.849.645.045.542.741.241.341.4

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value-250.005-261.788-266.099-329.016-344.133-356.246-357.016-366.082-378.468-390.383-388.669-374.993-397.295-398.999-395.107-415.128-427.208-373.532-373.308-361.334-368.872-374.067-366.459-359.441-361.737-362.761-353.49-347.503-347.762-347.472-335.658-324.908-324.568-324.377-310.982-299.573-278.606-270.235-221.11-196.475-195.711-192.649
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-20.4-21.9-22.3-33.1-35.6-37.2-38.3-39.1-43.7-47.1-53.1-53.4-60.9-63.2-64.3-70.1-72.5-60.1-59.1-56.9-58.4-60.3-56.4-54.4-55.0-55.4-52.8-52.5-53.0-53.5-50.1-47.9-48.1-49.2-46.2-44.7-43.3-42.6-32.8-28.2-28.2-27.9

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value-7922000.0-7687000.0-11517000.0-14639000.0-14799000.0-13230000.0-6041000.0-6571000.0-5824000.0-2865000.0-1308000.01286000.0649000.0734000.0184000.0-251000.0-286000.0-86000.0-68000.0-43000.0-32000.0-76000.07000.0-17000.027000.024000.058000.045000.051000.039000.038000.0-797000.0-717000.0-592000.0-619000.0-746000.0-3997000.0-1952000.0-2054000.0-165000.0259000.0378000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.6-0.6-1.0-1.5-1.5-1.4-0.6-0.7-0.7-0.3-0.20.20.10.10.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0-0.00.00.00.00.00.00.00.0-0.1-0.1-0.1-0.1-0.1-0.6-0.3-0.3-0.00.00.1

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312012-10-312012-07-31
Value3116000.02941000.01965000.01818000.01562000.01898000.01889000.01431000.02079000.02168000.02121000.02077000.01648000.01872000.01655000.01257000.01016000.0755000.0900000.0722000.0754000.0890000.0775000.0660000.0647000.0562000.0553000.0642000.0578000.0631000.0631000.0675000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312012-10-312012-07-31
Value3116000.02941000.01965000.01818000.01562000.01898000.01889000.01431000.02079000.02168000.02121000.02077000.01648000.01872000.01655000.01257000.01016000.0755000.0900000.0722000.0754000.0890000.0775000.0660000.0647000.0562000.0553000.0642000.0578000.0631000.0631000.0675000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312011-07-312010-07-31
Value4632284947144533334.77730413512283929102420331.724291311
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.717.014.024.425.38.123.416.717.92.917.724.221.38.718.824.419.08.016.913.623.41.421.411.09.3

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312011-07-312010-07-31
Value-29870000.0-31277000.0-37812000.0-30759000.0-46517000.0-24944000.0-28842000.0-74637000.0-54575000.0-19408000.0-54281000.0-52057000.0-29816000.0-28043000.0-26398000.0-20012000.0-20038000.0-9999000.0-19310000.0-15348000.0-18317000.0-9989000.0-21307000.0-17892000.0-7815000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-13.8-16.5-18.9-15.2-24.6-13.6-14.9-37.6-29.1-11.9-31.1-30.1-18.0-19.0-17.5-12.5-13.0-7.5-13.4-10.2-12.7-8.0-15.2-14.1-6.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312011-07-312010-07-31
Value-2.374-2.657143-0.609-24.33332-18.049434.322302411-5.76915-2.348-19.461-8.836-0.995-6.07-3.959-14.817.601-8.3774.393-4.385
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.1-1.471.4-0.3-12.918.0-9.321.82.318.713.96.5-3.510.6-1.6-12.1-5.7-0.7-4.2-2.6-10.26.1-6.03.5-3.6

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value14-1.78713318-23.14822-1.5571.871-16.77915
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.8-0.966.58.9-12.312.4-0.80.9-9.09.7

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

us-gaap:AmortizationOfFinancingCosts


Amortization
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value572000.0572000.0543000.0527000.0527000.0575000.0574000.0575000.0
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value4741000.02300000.0-53802000.0258000.0289000.0967000.023000.0298000.0-2137000.0188000.01171000.0804000.0462000.0-1187000.0-15909000.0100000.0358000.0-74000.055000.0225000.0203000.0100000.0168000.0211000.0465000.0-49000.0155000.0165000.0224000.0493000.0491000.0243000.0584000.0244000.0260000.0514000.0-4964000.0342000.0565000.0351000.0540000.069000.0939000.0-25442000.0642000.0526000.0659000.0
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value2422232322212120191718181715151615131516151416161613161516171513141515131414141414151413131515
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.3870.4530.5910.5960.5840.6060.5560.588
Percentage of DepreciationDepletionAndAmortization1.62.02.52.52.62.82.62.8

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cwst:EasternRegion


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value7.3136.6226.7136.6596.3395.9586.3086.3866.3685.266.2627.2677.035.9795.8666.1226.4235.4046.4187.2917.1386.197.0316.956
Percentage of DepreciationDepletionAndAmortization30.029.228.628.028.727.829.130.532.330.133.139.940.437.437.136.940.539.041.645.145.242.843.142.5

us-gaap:OperatingSegments, cwst:ResourceSolutionsRegion


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.5481.5681.5871.5441.5381.611.3961.3491.3031.294
Percentage of DepreciationDepletionAndAmortization6.46.96.86.57.07.56.46.46.67.4

us-gaap:OperatingSegments, cwst:WesternRegion


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value15141415131313121110108.8448.3518.0328.0048.5727.5866.6047.1027.016.9086.497.4597.617
Percentage of DepreciationDepletionAndAmortization62.061.962.263.061.761.861.860.357.958.556.148.648.050.350.751.747.847.746.043.343.744.945.746.5

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value9.5171.349-6.641-1.6183.621-10.5885.128-2.36111-7.9041.0821.5845.021.4050.0383.5043.027-4.485-2.31.267.228-6.112-5.1851.9598.737-9.1080.0045.476-4.4165.8279.789-2.953-7.543-2.710.2784.262-4.7272.5972.021.457-6.5066.6952.5647.64-3.4192.810.412
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value12-7.8720.5850.0480.059-6.507-9.6775.08412-2.694-6.3280.82312-1.2420.777-0.68310-5.569-2.1592.2728.049-7.133-3.5810.32610-3.2370.0912.1046.6099.8672.283-3.764-4.6470.1945.588-1.683-1.962-2.4545.96-0.56-8.952-5.4777.5477.04-7.2820.2663.249
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312011-07-312010-07-31
Value4632284947144533334.77730413512283929102420331.724291311
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.717.014.024.425.38.123.416.717.92.917.724.221.38.718.824.419.08.016.913.623.41.421.411.09.3

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value114.3116215120.9599.0661211-1.714-13.676221.704-3.912012-53.675-0.224-11.9737.5375.195-7.608-7.0192.2961.025-9.271-5.9870.2591.08-0.29-6.655-11.815-13.423-10.75-0.339-0.191-13.397-11.407-20.967-8.371-49.124-24.635-0.765-3.06248-6.365-1.154-2.902
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.52.331.47.56.40.54.76.26.4-1.0-7.812.91.0-2.713.27.5-34.9-0.2-8.35.03.6-6.1-5.01.60.7-8.0-7.00.20.8-0.2-4.8-9.9-11.9-9.1-0.3-0.1-12.3-9.9-17.4-6.9-46.2-21.5-0.6-2.445.8-5.7-0.9-2.4

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

us-gaap:InterestRateSwap, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.1560.990.6010.3370.1470.0440.025-0.610.156-0.0380.156-0.7410.112-0.138-0.069
Percentage of NetIncomeLoss7.68.262.73.71.20.4-1.54.50.7-2.2-4.0-3.70.90.330.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.50.30.20.10.00.0-0.30.1-0.00.1-0.50.1-0.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:InterestRateSwap us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value-1.06-1.018-0.99-0.479
Percentage of NetIncomeLoss-9.0-23.6-8.2-49.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.5-0.5-0.5-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value114.31115120.9591211-1.714-13.676221.704-3.91
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.52.37.56.40.56.26.4-1.0-7.812.91.0-2.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312010-07-31
Value15120.9599.0661211-1.714-13.676221.704-3.912012-53.675-0.224-11.9737.5375.192-7.614-7.022.2590.943-7.963-6.0170.3611.24-0.154-10.378-15.633-13.61-11.033-0.575-0.163-13.518-11.474-21.092-8.379-49.13-24.635-0.765-3.062-2.902
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.56.40.54.76.26.4-1.0-7.812.91.0-2.713.27.5-34.9-0.2-8.35.03.6-6.1-5.01.50.7-6.8-7.00.30.9-0.1-7.6-13.1-12.0-9.4-0.4-0.1-12.4-10.0-17.5-6.9-46.2-21.5-0.6-2.4-2.4

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value3116000.02941000.02874000.01965000.01818000.01562000.02005000.01898000.01889000.01431000.02079000.02168000.02121000.02077000.01648000.01872000.01655000.01257000.01016000.0755000.0900000.0722000.0754000.0890000.0775000.0660000.0647000.0627000.0562000.0537000.0553000.0576000.0642000.0578000.0631000.0676000.0534000.0631000.0675000.0548000.0-59000.0717000.0649000.0-460000.0705000.0780000.0567000.0
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312011-07-312010-07-31
Value-29870000.0-31277000.0-37812000.0-30759000.0-46517000.0-24944000.0-28842000.0-74637000.0-54575000.0-19408000.0-54281000.0-52057000.0-29816000.0-28043000.0-26398000.0-20012000.0-20038000.0-9999000.0-19310000.0-15348000.0-18317000.0-9989000.0-21307000.0-17892000.0-7815000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-13.8-16.5-18.9-15.2-24.6-13.6-14.9-37.6-29.1-11.9-31.1-30.1-18.0-19.0-17.5-12.5-13.0-7.5-13.4-10.2-12.7-8.0-15.2-14.1-6.4

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-03-312013-10-312013-07-31
Value292630253119272928182116277.922118158.6341613139.8481814114.444181916157.4771213
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312011-07-312010-07-31
Value-2.374-2.657143-0.609-24.33332-18.049434.322302411-5.76915-2.348-19.461-8.836-0.995-6.07-3.959-14.817.601-8.3774.393-4.385
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.1-1.471.4-0.3-12.918.0-9.321.82.318.713.96.5-3.510.6-1.6-12.1-5.7-0.7-4.2-2.6-10.26.1-6.03.5-3.6

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value81000.081000.090000.090000.090000.090000.098000.098000.0291000.0604000.0669000.0629000.0644000.0664000.0727000.01019000.01035000.01080000.01115000.01101000.01252000.01267000.01297000.01170000.01248000.01378000.01380000.01390000.01320000.01368000.01441000.01406000.01422000.01442.01357.01123.01527000.01661000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value8.518.518.918.918.918.919.29.26.86.626.375.985.955.915.825.685.765.986.135.986.826.937.037.117.257.697.77.758.078.658.478.548.588.488.8110.2110.6510.55
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits


Share
Period End2021-06-302021-03-312014-04-302014-01-312013-10-312013-07-31
Value13000.088000.03000.0064000.0475000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod100.0100.0100.00.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxLiabilities

us-gaap:StateAndLocalJurisdiction


Deferred
Period End2020-12-31
Value0.912
Percentage of DeferredTaxLiabilities100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value80292930242323242319
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value6.482696968979387847050
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:AccountsReceivableAllowanceForCreditLossWriteoffRecoveries

cwst:AccountsReceivableAllowanceForCreditLossWriteoffRecoveries


Accounts
Period End2020-12-31
Value312000.0
Percentage of AccountsReceivableAllowanceForCreditLossWriteoffRecoveries100.0

cwst:AccrualForEnvironmentalLossContingenciesObligationsIncurred us-gaap:EnvironmentalRemediationSite

cwst:AccrualForEnvironmentalLossContingenciesObligationsIncurred

cwst:SouthbridgeLandfill


Accrual
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302016-12-31
Value001000.027000.00000000
Percentage of AccrualForEnvironmentalLossContingenciesObligationsIncurred0.00.0100.0100.00.00.00.00.00.00.00.0

cwst:AdditionalSharesIssuedMaximumAttainmentLevel us-gaap:AwardType, us-gaap:StatementClassOfStock

cwst:AdditionalSharesIssuedMaximumAttainmentLevel

cwst:PerformanceStockUnit, us-gaap:CommonClassA


Additional
Period End2021-06-302021-03-312020-12-31
Value-3000.0268000.0-87000.0
Percentage of AdditionalSharesIssuedMaximumAttainmentLevel100.0100.0100.0

cwst:BusinessAcquisitionsProFormaOperatingIncomeLoss

cwst:BusinessAcquisitionsProFormaOperatingIncomeLoss


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-10-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-31
Value21121420177.0371419155.868-2.52229150.8571018-47.2736.5779.99817151.9144.623121110-5.973-1.2159.5089.7370.8910.5844.8976.105
Percentage of BusinessAcquisitionsProFormaOperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:ExpenseFromAcquisitionActivities

cwst:ExpenseFromAcquisitionActivities


Expense
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value1632000.0414000.0173000.0352000.01009000.01097000.0464000.0
Percentage of ExpenseFromAcquisitionActivities100.0100.0100.0100.0100.0100.0100.0

cwst:IncreaseDecreaseInLandfillOperatingLeaseContractExpenditures

cwst:IncreaseDecreaseInLandfillOperatingLeaseContractExpenditures


Increase
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-1318000.0-160000.0-2028000.0-1308000.0-50000.0-1057000.0-2090000.0-50000.0
Percentage of IncreaseDecreaseInLandfillOperatingLeaseContractExpenditures100.0100.0100.0100.0100.0100.0100.0100.0

cwst:NonCashExpenseFromAcquisitionActivities

cwst:NonCashExpenseFromAcquisitionActivities


Non
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value876000.0146000.0-26000.043000.0532000.0139000.0
Percentage of NonCashExpenseFromAcquisitionActivities100.0100.0100.0100.0100.0100.0

cwst:OtherComprehensiveIncomeLossCashFlowHedgeGainLossChangeInFairValueBeforeReclassificationAndTax

cwst:OtherComprehensiveIncomeLossCashFlowHedgeGainLossChangeInFairValueBeforeReclassificationAndTax


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value-336000.04987000.0-1619000.0-7257000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossChangeInFairValueBeforeReclassificationAndTax100.0100.0100.0100.0

cwst:OtherComprehensiveIncomeLossCashFlowHedgeGainLossSettlementsBeforeReclassificationAndTax

cwst:OtherComprehensiveIncomeLossCashFlowHedgeGainLossSettlementsBeforeReclassificationAndTax


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value-1186000.0-1160000.0-940000.0-411000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossSettlementsBeforeReclassificationAndTax100.0100.0100.0100.0

cwst:SouthbridgeLandfillClosureCharge

cwst:SouthbridgeLandfillClosureCharge


Southbridge
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value195000.0157000.02642000.0559000.0613000.0625000.0917000.0
Percentage of SouthbridgeLandfillClosureCharge100.0100.0100.0100.0100.0100.0100.0

cwst:SouthbridgeLandfillClosureCharge us-gaap:EnvironmentalRemediationSite

cwst:SouthbridgeLandfill


Southbridge
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value195000.0157000.02642000.0559000.0613000.0625000.0917000.0
Percentage of SouthbridgeLandfillClosureCharge100.0100.0100.0100.0100.0100.0100.0

cwst:SouthbridgeLandfillNonCashClosureCharge

cwst:SouthbridgeLandfillNonCashClosureCharge


Southbridge
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value-9000.0-7000.02036000.0-10000.051000.0-121000.0
Percentage of SouthbridgeLandfillNonCashClosureCharge100.0100.0100.0100.0100.0100.0

us-gaap:AccretionExpenseIncludingAssetRetirementObligations

us-gaap:AccretionExpenseIncludingAssetRetirementObligations


Accretion
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-31
Value2005000.01957000.01766000.01782000.01748000.01794000.01666000.01731000.01775000.01804000.01417000.01429000.01440000.01422000.01277000.01266000.0974000.0965000.0918000.0906000.0896000.0886000.0877000.0868000.0856000.0848000.0920000.0829000.0832000.0809000.0901000.01017000.01016000.01022000.01046000.0919000.0898000.0925000.0933000.0866000.0873000.0871000.0869000.0
Percentage of AccretionExpenseIncludingAssetRetirementObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses

cwst:SouthbridgeLandfill


Accrual
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value28000.028000.028000.028000.032000.030000.030000.029000.031000.034000.036000.038000.0
Percentage of AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForEnvironmentalLossContingenciesPayments1 us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesPayments1

cwst:PotsdamEnvironmentalLiability


Accrual
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value02699000.001764000.0073000.087000.05000.06000.087000.016000.05000.000255000.00
Percentage of AccrualForEnvironmentalLossContingenciesPayments10.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0

cwst:SouthbridgeLandfill


Accrual
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value00281000.012000.0145000.0164000.0251000.0141000.0303000.0171000.0204000.0237000.0284000.0241000.0000
Percentage of AccrualForEnvironmentalLossContingenciesPayments10.00.00.00.05.40.014.20.0415.1196.64080.03950.0326.41506.20.00.00.0

us-gaap:AdjustmentForAmortization us-gaap:EnvironmentalRemediationSite

us-gaap:AdjustmentForAmortization

cwst:SouthbridgeLandfill


Adjustment
Period End2020-09-302020-06-30
Value0.00.152
Percentage of AdjustmentForAmortization0.0100.0

us-gaap:AssetRetirementObligationAccretionExpense

us-gaap:AssetRetirementObligationAccretionExpense


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-31
Value1865000.01811000.01610000.01622000.01582000.01622000.01485000.01548000.01587000.01607000.01381000.01391000.01401000.01383000.01237000.01225000.0974000.0965000.0918000.0906000.0896000.0886000.0857000.0848000.0837000.0828000.0885000.0795000.0798000.0893000.0986000.0983000.0982000.0988000.01011000.0-6191000.0864000.0890000.0899000.0-5851000.0839000.0836000.0835000.0
Percentage of AssetRetirementObligationAccretionExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationLiabilitiesIncurred

us-gaap:AssetRetirementObligationLiabilitiesIncurred


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-31
Value1281000.01038000.01020000.01056000.0866000.0898000.0648000.0684000.0674000.0543000.0839000.01081000.0995000.0798000.0835000.0877000.0754000.0556000.0613000.0685000.0617000.0526000.0-173000.0855000.0675000.0441000.01134000.0856000.0884000.0904000.0686000.0736000.01017000.01041000.0877000.0582000.0646000.0876000.01084000.0773000.0933000.0661000.0756000.0
Percentage of AssetRetirementObligationLiabilitiesIncurred100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationLiabilitiesSettled

us-gaap:AssetRetirementObligationLiabilitiesSettled


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value2612000.0357000.01495000.01056000.0553000.01097000.01287000.04152000.01391000.01556000.01269000.01696000.0317000.0297000.0252000.0279000.0181000.0126000.0228000.0169000.0234000.0198000.0-283000.01225000.0480000.0504000.03117000.0493000.0212000.0
Percentage of AssetRetirementObligationLiabilitiesSettled100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationRevisionOfEstimate

us-gaap:AssetRetirementObligationRevisionOfEstimate


Asset
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value4.3790.0-1.5380.00.00.03.6030.00.01.4921.90.09.5980.0-1.9960.0-2.03
Percentage of AssetRetirementObligationRevisionOfEstimate100.00.0100.00.00.00.0100.00.00.0100.0100.00.0100.00.0100.00.0100.0

us-gaap:BusinessAcquisitionProFormaEarningsPerShareBasic

us-gaap:BusinessAcquisitionProFormaEarningsPerShareBasic


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-10-312013-10-31
Value0.230.081.290.310.250.020.190.270.25-0.02-0.290.530.040.480.29-1.28-0.01-0.290.180.13-0.19-0.170.060.020.01-0.01
Percentage of BusinessAcquisitionProFormaEarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessAcquisitionProFormaEarningsPerShareDiluted

us-gaap:BusinessAcquisitionProFormaEarningsPerShareDiluted


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-10-312013-10-31
Value0.230.081.280.310.250.020.190.270.25-0.02-0.280.510.040.480.28-1.28-0.280.180.12-0.170.050.020.01-0.01
Percentage of BusinessAcquisitionProFormaEarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-10-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-31
Value114.3356215120.979.0831211-0.921-12.176221.704-3.92012-53.673-0.217-11.9747.5375.195-7.645-7.0652.2490.9780.261-11.814-10.721-0.312-0.191-13.398-11.442-20.981-8.506-49.279-24.795-0.819
Percentage of BusinessAcquisitionsProFormaNetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessAcquisitionsProFormaRevenue

us-gaap:BusinessAcquisitionsProFormaRevenue


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-10-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-31
Value21618920520218918319420418917819717616514715216015413314315114412614014714414111811813212898116120121101119130128
Percentage of BusinessAcquisitionsProFormaRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

cwst:TransferStationsAcquisition


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1.0333.857.0314.4165.3511.252280.032470.053191.80.94.90.460.00.02.8390.00.0
Percentage of BusinessCombinationConsiderationTransferred1100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.0

us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred

cwst:TransferStationsAcquisition


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value120000.0385000.01103000.0550000.02257000.0580000.0120000.0635000.01120000.003525000.04824000.0-186000.0358000.0002354000.046000.0-400000.0400000.0000
Percentage of BusinessCombinationConsiderationTransferredLiabilitiesIncurred100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.00.00.00.0

us-gaap:EnvironmentalCostsRecognizedRecoveryCreditedToExpense us-gaap:EnvironmentalRemediationSite

us-gaap:EnvironmentalCostsRecognizedRecoveryCreditedToExpense

cwst:SouthbridgeLandfill


Environmental
Period End2020-12-312020-09-302020-06-30
Value00188000.0
Percentage of EnvironmentalCostsRecognizedRecoveryCreditedToExpense0.00.0100.0

us-gaap:FairValueOfAssetsAcquired

us-gaap:FairValueOfAssetsAcquired


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-31
Value1.3254.5691.1325.0785.396.4693.2560.4646.862.4732.751.0751.8231.4440.00.7512.8130.00.4580.9753.264-0.028231.2613.5-0.0671.540.00.744
Percentage of FairValueOfAssetsAcquired100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestExpense


Finance
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value338000.0327000.0290000.0246000.0212000.0213000.0186000.0156000.0
Percentage of FinanceLeaseInterestExpense100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeasePrincipalPayments

us-gaap:FinanceLeasePrincipalPayments


Finance
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1694000.01304000.0981000.0961000.0731000.0666000.0733000.0471000.0
Percentage of FinanceLeasePrincipalPayments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:FinanceLeaseRightOfUseAssetAmortization


Finance
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1120000.01025000.0859000.0731000.0617000.0593000.0503000.0409000.0
Percentage of FinanceLeaseRightOfUseAssetAmortization100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:GainLossOnSaleOfPropertyPlantEquipment


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value68000.024000.0-682000.0-123000.06000.0-137000.086000.0479000.0270000.057000.078000.044000.087000.0283000.0-92000.0-54000.013000.084000.033000.021000.0317000.0203000.0-6000.044000.047000.046000.0128000.016000.025000.0148000.0232000.0185000.0219000.0225000.0164000.0-15000.0199000.0177000.046000.0102000.0148000.0562000.0192000.071000.097000.0149000.0153000.0
Percentage of GainLossOnSaleOfPropertyPlantEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillAcquiredDuringPeriod

us-gaap:GoodwillAcquiredDuringPeriod


Goodwill
Period End2021-03-312020-03-312018-03-312017-03-312012-07-31
Value1.4150.8077.7120.0370.81
Percentage of GoodwillAcquiredDuringPeriod100.0100.0100.0100.0100.0

us-gaap:GoodwillAcquiredDuringPeriod us-gaap:StatementBusinessSegments

cwst:WesternRegion


Goodwill
Period End2021-03-312020-03-312018-03-312017-03-312012-07-31
Value1.4150.8071.7040.0370.81
Percentage of GoodwillAcquiredDuringPeriod100.0100.022.1100.0100.0

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance


Income
Period End2020-12-312019-12-312019-06-302018-12-312018-03-31
Value-54.966-0.248-2.1370.698-1.635
Percentage of IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value5621000.0-12730000.0-5075000.03827000.05022000.0-12932000.0-4945000.0-3058000.0-4438000.0-10490000.0-4959000.0-1990000.0
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-31
Value5115000.02077000.0-1697000.0599000.02138000.0171000.0372000.0-1678000.0-455000.03430000.0294000.01788000.0-3121000.0504000.0-318000.02239000.0-662000.0145000.0-1006000.02480000.0-710000.01492000.0-4438000.01263000.0-1337000.0-4341000.02104000.0-193000.0913000.0684000.0-2267000.0-1743000.0-267000.0818000.02179000.0-4701000.0399000.0924000.0-678000.0
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-09-302015-06-302014-09-30
Value180000.0208000.012000.0249000.0215000.0257000.0109000.0671000.0757000.00147000.01396000.01255000.001344000.00-727000.0910000.0466000.0473000.0399000.0268000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeOther

us-gaap:InterestIncomeOther


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-31
Value0.0660.0640.10.1070.0450.0510.080.0660.1050.1170.1120.0530.0790.0290.0930.0580.0520.0690.0610.0640.060.1040.0630.0560.070.1410.0810.0840.0880.0850.090.110.1090.1010.0120.0730.050.010.008
Percentage of InterestIncomeOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.3966.645.9736.1286.3436.2966.1335.457
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LegalFees us-gaap:EnvironmentalRemediationSite

us-gaap:LegalFees

cwst:SouthbridgeLandfill


Legal
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value434000.0642000.0595000.0613000.0612000.0625000.0917000.0555000.01058000.0502000.0172000.0370000.0
Percentage of LegalFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LitigationSettlementAmountAwardedToOtherParty dei:LegalEntity, us-gaap:LitigationCase, us-gaap:EnvironmentalRemediationSite

us-gaap:LitigationSettlementAmountAwardedToOtherParty

cwst:CasellaWasteSystemsAndTownOfSouthbridgeMassachusetts, cwst:CitizenGroupsAndTheResidentsLitigationCase, cwst:SouthbridgeLandfill


Litigation
Period End2020-09-18
Value3000000.0
Percentage of LitigationSettlementAmountAwardedToOtherParty100.0

cwst:TownOfSouthbridgeMassachusetts, cwst:CitizenGroupsAndTheResidentsLitigationCase, cwst:SouthbridgeLandfill


Litigation
Period End2020-09-18
Value1000000.0
Percentage of LitigationSettlementAmountAwardedToOtherParty33.3

us-gaap:LitigationSettlementAmountAwardedToOtherParty us-gaap:EnvironmentalRemediationSite

cwst:SouthbridgeLandfill


Litigation
Period End2020-09-30
Value2000000.0
Percentage of LitigationSettlementAmountAwardedToOtherParty0.0

us-gaap:LitigationSettlementAmountAwardedToOtherParty us-gaap:LitigationCase

cwst:OntarioCountyNewYorkClassActionLitigation


Litigation
Period End2020-12-01
Value750000.0
Percentage of LitigationSettlementAmountAwardedToOtherParty0.0

us-gaap:LitigationSettlementAmountAwardedToOtherParty us-gaap:LitigationCase, us-gaap:EnvironmentalRemediationSite

cwst:CitizenGroupsAndTheResidentsLitigationCase, cwst:SouthbridgeLandfill


Litigation
Period End2020-09-18
Value2000000.0
Percentage of LitigationSettlementAmountAwardedToOtherParty66.7

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2021-06-302021-03-31
Value-1522000.03827000.0
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent100.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.914.2913.9664.094.424.3084.3174.227
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseCost us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Landfill


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.072.2431.7951.6732.1311.9571.9751.648
Percentage of OperatingLeaseCost52.952.345.340.948.245.445.739.0

us-gaap:MachineryAndEquipment


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.842.0482.1712.4172.2892.3512.3422.579
Percentage of OperatingLeaseCost47.147.754.759.151.854.654.361.0

us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeaseExpense


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1415000.01411000.01840000.02048000.02171000.02417000.02287000.02351000.02342000.02579000.0
Percentage of OperatingLeaseExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseExpense us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Landfill


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1977000.01604000.02070000.02243000.01795000.01673000.02131000.01957000.01975000.01648000.0
Percentage of OperatingLeaseExpense139.7113.7112.5109.582.769.293.283.284.363.9

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.493.8743.2722.4424.0032.9634.8312.043
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-320000.04972000.01205000.0160000.0-1569000.0-7301000.0530000.0-747000.0-2959000.0-1557000.0-3007000.0872000.0-117000.0777000.0520000.035000.0-200000.0-18000.0
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Other
Period End2020-12-31
Value0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax0.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-1202000.0-1145000.0-1166000.0-1156000.0-990000.0-489000.0-337000.0-147000.0-44000.0-25000.0-116000.0-156000.0-38000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument, us-gaap:InterestExpense


Other
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-1156000.0-990000.0-489000.0-337000.0-147000.0-44000.0-25000.0-116000.0-156000.0-38000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:InterestRateSwap, us-gaap:InterestExpense


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value-1202000.0-1145000.0-990000.0-367000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax100.0100.0100.075.1

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax


Other
Period End2020-09-302019-09-30
Value-1141000.0-121000.0
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax

us-gaap:AccumulatedOtherComprehensiveIncome, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-235000.0-7687000.03122000.0160000.0-1569000.0-13230000.0530000.0-747000.0
Percentage of OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodAfterTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax

us-gaap:AccumulatedOtherComprehensiveIncome, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-320000.0-8462000.01205000.0160000.0-1569000.0-13230000.0530000.0-747000.0
Percentage of OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax

us-gaap:AccumulatedOtherComprehensiveIncome, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Other
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-30
Value-85000.0-775000.00000
Percentage of OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax100.0100.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312013-07-312013-04-302013-01-312012-04-302012-01-31
Value-235000.03830000.03122000.0160000.0-1569000.0-7189000.0530000.0-747000.0-2959000.0-1557000.0-2594000.0637000.0-85000.0568000.0435000.035000.0-200000.0-18000.0-125000.027000.0127000.0102000.0-1888000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-31
Value-235000.03830000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2020-12-312020-09-30
Value3122000.0160000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312013-07-312013-04-30
Value-235000.03830000.0160000.0-1569000.0-7189000.0-747000.0-2959000.0-1557000.0-2594000.0637000.0-85000.0568000.0-125000.027000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-31
Value-85000.01142000.0
Percentage of OtherComprehensiveIncomeLossTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-85000.01142000.000-112000.00000-413000.0235000.0-32000.0209000.085000.0000
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent1100.0100.00.00.0100.00.00.00.00.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2020-09-30
Value0
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent10.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax


Other
Period End2020-09-302019-09-302019-03-312018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value145000.0-656000.0-1554000.0785000.0530000.015000.0-212000.0-66000.00000
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsOfDebtIssuanceCosts


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value01520000.0011000.0749000.000006000.05567000.001000.00831000.0620000.07464000.00583000.099000.034000.0928000.01211000.06852000.0
Percentage of PaymentsOfDebtIssuanceCosts0.0100.00.0100.0100.00.00.00.00.0100.0100.00.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312010-07-31
Value0.9134.5687.0785.288145.1441.88345261.22230380.411181.4930.8692.280.4140.40.02.4390.00.0-0.2145.6972.7930.0290.119201.4853.150.01.3870.00.7150.0
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.00.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired us-gaap:BusinessAcquisition

cwst:TransferStationsAcquisition


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.9133.4655.9283.85144.7711.0845250.02838
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.075.983.872.896.692.757.499.396.50.093.999.6

us-gaap:ProceedsFromHedgeInvestingActivities us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:ProceedsFromHedgeInvestingActivities

us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Proceeds
Period End2020-12-31
Value0
Percentage of ProceedsFromHedgeInvestingActivities0.0

us-gaap:ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet

us-gaap:ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.66317737680301067374626639294571464146164586534197
Percentage of ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-10-312014-09-302014-07-31
Value0112000.0000100000.001078000.02017000.0260000.0073000.088000.0310000.0275000.0145000.0500000.0358000.0128000.0000000143000.0
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions0.0100.00.00.00.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value280000.0123000.0103000.0230000.0149000.051000.0208000.0179000.0306000.057000.0261000.0140000.0127000.0342000.054000.0275000.0298000.084000.0293000.0112000.0598000.0359000.079000.0377000.0170000.089000.0179000.0111000.0163000.0232000.0276000.0216000.0319000.0645000.0284000.088000.0238000.0292000.0265000.0155000.0167000.0971000.0199000.0328000.076000.0247000.0308000.0
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForDoubtfulAccounts


Provision
Period End2020-12-31
Value-36000.0
Percentage of ProvisionForDoubtfulAccounts100.0

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2021-06-302021-03-31
Value-1202000.0-1145000.0
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent100.0100.0

us-gaap:RepaymentsOfLongTermDebtAndCapitalSecurities

us-gaap:RepaymentsOfLongTermDebtAndCapitalSecurities


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-302011-01-312010-10-312010-07-31
Value2.8742.7694.37624240934028804326462514149547145619745769615218630393446444135432940931784833373744355524637
Percentage of RepaymentsOfLongTermDebtAndCapitalSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability


Right
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.1325.0785.3916.4022.5760.04.3842.473
Percentage of RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value739000.0512000.0556000.0147000.0776000.02366000.01932000.0831000.0173000.0415000.0
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SaleOfStockConsiderationReceivedOnTransaction us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

us-gaap:SaleOfStockConsiderationReceivedOnTransaction

us-gaap:CommonClassA, us-gaap:SubsequentEvent


Sale
Period End2020-10-30
Value144
Percentage of SaleOfStockConsiderationReceivedOnTransaction100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits


Share
Period End2021-06-302021-03-312020-12-31
Value-4.7356.040.75
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits


Share
Period End2021-06-302021-03-312020-12-31
Value-0.1267.480.02
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod us-gaap:AwardType, us-gaap:StatementClassOfStock

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits, us-gaap:CommonClassA


Share
Period End2021-06-302021-03-31
Value13000.068000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302016-06-302015-12-312015-09-302015-06-30
Value0.8874.405120.0410.8721.6470.3520.2751.701
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType, us-gaap:StatementClassOfStock

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits, us-gaap:CommonClassA


Share
Period End2021-06-302021-03-31
Value2.5932.69
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

us-gaap:EmployeeStockOption


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value0.4480.4480.00.00.2960.07.7419.7170.00.3610.4034.3670.0910.153
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue100.0100.00.00.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-31
Value012.480
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice0.0100.00.0

us-gaap:ShortTermLeaseCost

us-gaap:ShortTermLeaseCost


Short
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value916000.0856000.0729000.0929000.01617000.0853000.01092000.0658000.0
Percentage of ShortTermLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonClassA, us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value24000.0273000.02000.026000.0517000.0193000.0347000.0676000.017000.065000.0402000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised


Stock
Period End2021-06-302021-03-31
Value09000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised0.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value492000.0112000.0387000.0100000.01078000.02318000.0260000.0274000.072000.0361000.0310000.0535000.0145000.0741000.0358000.0340000.00191000.0-3000.0194000.0163000.0129000.00
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStock


Stock
Period End2021-03-312020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value3000.05000.02000.03000.07000.0001000.04000.02000.01000.01000.03000.01000.00
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation2.75.00.20.12.70.00.00.31.30.40.70.10.80.30.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value492000.0109000.0387000.095000.01076000.02315000.0253000.0274000.072000.0360000.0306000.0533000.0144000.0740000.0355000.0339000.00188000.0-4000.0193000.0162000.0126000.00
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.097.3100.095.099.899.997.3100.0100.099.798.799.699.399.999.299.70.098.4133.399.599.497.70.0

us-gaap:ValuationAllowanceDeferredTaxAssetChangeInAmount

us-gaap:ValuationAllowanceDeferredTaxAssetChangeInAmount


Valuation
Period End2020-12-31
Value-53.644
Percentage of ValuationAllowanceDeferredTaxAssetChangeInAmount100.0

us-gaap:VariableLeaseCost

us-gaap:VariableLeaseCost


Variable
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value112000.0141000.0129000.0132000.0-522000.0329000.035000.07000.0
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

us-gaap:WeightedAverageNumberOfSharesIssuedBasic


Weighted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-10-312014-09-302014-07-312014-06-302014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-31
Value18000.0181000.02165000.0-64000.021000.0338000.0-177000.0117000.0150000.01354000.055000.0109000.054000.0280000.0224000.010000.0131000.0208000.029000.02000.0241000.0120000.016000.029000.0312000.048000.01000.0189000.0317000.06000.025000.048000.0139000.0-1646000.0282000.07932000.0236000.0-30000.026000.050000.0181000.0
Percentage of WeightedAverageNumberOfSharesIssuedBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberOfSharesRestrictedStock

us-gaap:WeightedAverageNumberOfSharesRestrictedStock


Weighted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2000.02000.002000.01000.01000.0-9000.09000.09000.09000.0-23000.032000.038000.038000.0
Percentage of WeightedAverageNumberOfSharesRestrictedStock100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:AssetRetirementObligationMeasurementInput us-gaap:Range, us-gaap:MeasurementInputType

cwst:AssetRetirementObligationMeasurementInput

srt:Maximum, us-gaap:MeasurementInputDiscountRate


Asset
Period End2020-12-312019-12-31
Value10.20.1
Percentage of AssetRetirementObligationMeasurementInput100.0100.0

srt:Minimum, us-gaap:MeasurementInputDiscountRate


Asset
Period End2020-12-312019-12-31
Value8.20.087
Percentage of AssetRetirementObligationMeasurementInput80.487.0

cwst:FinanceLeaseLiabilityToBePaidAfterYearFour

cwst:FinanceLeaseLiabilityToBePaidAfterYearFour


Finance
Period End2020-09-30
Value11
Percentage of FinanceLeaseLiabilityToBePaidAfterYearFour100.0

cwst:FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour

cwst:FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour


Finite
Period End2021-06-302021-03-312020-09-30
Value202027
Percentage of FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour100.0100.0100.0

cwst:LesseeOperatingLeaseLiabilityToBePaidAfterYearFour

cwst:LesseeOperatingLeaseLiabilityToBePaidAfterYearFour


Lessee
Period End2020-09-30
Value63
Percentage of LesseeOperatingLeaseLiabilityToBePaidAfterYearFour100.0

cwst:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedAggregateIntrinsicValue us-gaap:AwardType

cwst:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedAggregateIntrinsicValue

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits


Sharebased
Period End2020-12-31
Value31
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedAggregateIntrinsicValue100.0

cwst:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsUnvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

cwst:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsUnvestedWeightedAverageGrantDateFairValue

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits


Sharebased
Period End2020-12-31
Value42.77
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsUnvestedWeightedAverageGrantDateFairValue100.0

dei:EntityCommonStockSharesOutstanding us-gaap:StatementClassOfStock

dei:EntityCommonStockSharesOutstanding

us-gaap:CommonClassA


Entity
Period End2020-07-152020-04-302020-02-152019-10-152019-07-152019-04-152019-02-142018-10-312018-07-312018-04-302018-02-142017-10-312017-07-312017-04-282017-02-282016-10-312016-07-152016-04-152016-01-292015-10-152015-07-152015-04-272015-01-302014-11-172014-08-152014-05-312014-02-142013-11-152013-08-222013-05-312013-02-282012-11-302012-08-202012-05-312012-02-152011-11-152011-08-25
Value47474646465984645414141414141404040404040393939393939393939383838372625252525
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonClassB


Entity
Period End2020-07-152020-04-302020-02-152019-10-152019-07-152019-04-152019-02-142018-10-312018-07-312018-04-302018-02-142017-10-312017-07-312017-04-282017-02-282016-10-312016-07-152016-04-152016-01-292015-10-152015-07-152015-04-272015-01-302014-11-172014-08-152014-05-312014-02-142013-11-152013-08-222013-05-312013-02-282012-11-302012-08-202012-05-312012-02-152011-11-152011-08-25
Value0.98820.98820.98820.98829880.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.98820.9882
Percentage of EntityCommonStockSharesOutstanding2.12.12.12.12.12.12.22.42.42.42.42.42.42.42.42.42.42.52.52.52.52.52.52.52.52.52.52.52.52.62.62.63.73.83.83.83.8

us-gaap:AccountsPayableRelatedPartiesCurrent

us-gaap:AccountsPayableRelatedPartiesCurrent


Accounts
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value1297000.0851000.032000.030000.018000.028000.02000.0890000.01189000.045000.0
Percentage of AccountsPayableRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForEnvironmentalLossContingencies

us-gaap:AccrualForEnvironmentalLossContingencies


Accrual
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-10-312013-07-312013-04-30
Value5.25.74710115.8665.2215.1425.325.3975.3635.297
Percentage of AccrualForEnvironmentalLossContingencies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForEnvironmentalLossContingencies us-gaap:EnvironmentalRemediationSite

cwst:PotsdamEnvironmentalLiability


Accrual
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-12-312013-10-312013-04-302012-04-30
Value0.9390.9390.9390.9391.1511.1511.1513.853.855.6145.6145.665.7475.7525.7585.8455.8615.8665.8664.9665.2215.2215.2215.2015.1825.1625.1425.1195.1085.3545.3445.325.4295.4065.4215.3975.2975.21
Percentage of AccrualForEnvironmentalLossContingencies0.00.018.10.00.00.020.00.00.00.052.00.00.00.049.20.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.00.0100.00.00.00.0100.0100.00.0

cwst:SouthbridgeLandfill


Accrual
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value4.0364.2894.2614.2334.2054.6414.5964.7114.8465.0665.1735.445.5735.7385.9366.1796.3790.00.00.00.0
Percentage of AccrualForEnvironmentalLossContingencies0.00.081.90.00.00.080.00.00.00.048.00.00.00.050.80.00.00.00.00.00.0

us-gaap:AccrualForEnvironmentalLossContingenciesDiscount

us-gaap:AccrualForEnvironmentalLossContingenciesDiscount


Accrual
Period End2020-12-31
Value1163000.0
Percentage of AccrualForEnvironmentalLossContingenciesDiscount100.0

us-gaap:AccrualForEnvironmentalLossContingenciesDiscountRate us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesDiscountRate

cwst:PotsdamEnvironmentalLiability


Accrual
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302014-01-312013-04-30
Value1.91.91.91.50.0150.0150.0150.0150.0150.0150.0150.0150.0150.0150.0150.0150.0150.0270.027
Percentage of AccrualForEnvironmentalLossContingenciesDiscountRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cwst:SouthbridgeLandfill


Accrual
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2.62.62.62.60.0260.0190.0190.0260.0260.0260.0260.0260.0260.0260.0260.0260.026
Percentage of AccrualForEnvironmentalLossContingenciesDiscountRate136.8136.8136.8173.3173.3126.7126.7173.3173.3173.3173.3173.3173.3173.3173.3173.3173.3

us-gaap:AccrualForEnvironmentalLossContingenciesGross

us-gaap:AccrualForEnvironmentalLossContingenciesGross


Accrual
Period End2020-12-312019-12-31
Value6363000.06603000.0
Percentage of AccrualForEnvironmentalLossContingenciesGross100.0100.0

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear


Accrual
Period End2020-12-31
Value4667000.0
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear100.0

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear


Accrual
Period End2020-12-31
Value345000.0
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear100.0

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear


Accrual
Period End2020-12-31
Value320000.0
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear100.0

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear


Accrual
Period End2020-12-31
Value319000.0
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear100.0

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear


Accrual
Period End2020-12-31
Value335000.0
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear100.0

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear


Accrual
Period End2020-12-31
Value377000.0
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear100.0

us-gaap:AccruedCappingClosurePostClosureAndEnvironmentalCosts

us-gaap:AccruedCappingClosurePostClosureAndEnvironmentalCosts


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value111110119.0059.689108.5279.15911119.4276.4063.4583.0351.7050.9430.7050.6680.6120.6040.7060.7320.7951.6581.9852.2083.8274.6697.3125.7145.2815.9393.8354.9037.0694.4344.9074.6684.6021.6331.702
Percentage of AccruedCappingClosurePostClosureAndEnvironmentalCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent

us-gaap:AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value747372666663616465626159616259565544434442414041393837403837414038393734363435343634
Percentage of AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value2238000.02095000.02333000.02681000.02615000.02092000.01468000.01478000.01275000.0921000.0931000.0949000.0865000.0743000.0809000.0694000.0601000.0645000.01069000.01081000.01070000.0989000.0988000.01037000.01903000.01948000.02153000.02356000.02081000.01672000.02437000.02054000.01350000.01573000.01513000.01213000.0936000.0740000.01355000.01412000.01125000.0920000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligation

us-gaap:AssetRetirementObligation


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-09-302014-07-312014-06-302014-04-302014-03-312014-01-312013-12-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value85858277757371727473736867656258564544444342414241403944434345444746464544434241403939383736
Percentage of AssetRetirementObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligation us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Landfill


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value0.0250.0370.0480.060.070.0750.0840.0940.10.084
Percentage of AssetRetirementObligation0.00.10.10.10.20.20.20.20.20.2

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1953000.01871000.01586000.01395000.01345000.01248000.01229000.01198000.01197000.01220000.01084000.01065000.0
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value153000.0614000.006000.0412000.0820000.02159000.01351000.01055000.0401000.058000.095000.0
Percentage of AssetsFairValueDisclosure7.832.80.00.430.665.7175.7112.888.132.95.48.9

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings

cwst:TransferStationsAcquisition


Business
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-30
Value1908000.01908000.02118000.0678000.05422000.05422000.02602000.007889000.07539000.05578000.05578000.000001360000.01360000.01360000.000
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.00.00.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets

cwst:TransferStationsAcquisition


Business
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-30
Value13000.0181000.0227000.0132000.02051000.01935000.01865000.03276000.02968000.01640000.01587000.093000.000040000.040000.040000.000
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.00.00.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment

cwst:TransferStationsAcquisition


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1.5491.25413108.2772.39620208.6550.023114.6424.6422.9942.4522.2910.170.2690.2690.2690.00.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill

cwst:TransferStationsAcquisition


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1.6461.2858.4057.1595.9121.2253131110.029202.72.72.3341.671.3170.2620.00.00.00.00.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand

cwst:TransferStationsAcquisition


Business
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-30
Value895000.0895000.0685000.0325000.02487000.02487000.0726000.00000000353000.0353000.0353000.000
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0100.0100.0100.00.00.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities

cwst:TransferStationsAcquisition


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value82000.076000.0484000.0306000.0222000.080000.03122000.03040000.01546000.004708000.02443000.01276000.01276000.049000.049000.049000.09000.0106000.0106000.0106000.0000
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet

cwst:TransferStationsAcquisition


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value3.1262.4632419164.5445656210.0593811115.3724.0733.5590.4231.9161.9161.9160.00.00.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:ContractWithCustomerAssetGrossCurrent

us-gaap:ContractWithCustomerAssetGrossCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value796774747474809083707379770.0664290.066227
Percentage of ContractWithCustomerAssetGrossCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentCarryingAmount

cwst:TermFacilityDueMay2023TermLoanBFacility, us-gaap:SecuredDebt


Debt
Period End2021-06-302021-03-312020-12-312019-12-31
Value348349350350
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:LongtermDebtType

cwst:NotesPayable


Debt
Period End2021-06-302021-03-312020-12-312019-12-31
Value4.4544.5224.9335.464
Percentage of DebtInstrumentCarryingAmount1.31.31.41.6

us-gaap:DebtInstrumentFairValue us-gaap:DebtInstrument, us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentFairValue

cwst:RevolvingCreditFacilityDueMayTwoThousandTwentyThree, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:RevolvingCreditFacility


Debt
Period End2020-12-312019-12-31
Value0.026
Percentage of DebtInstrumentFairValue0.0100.0

cwst:TermFacilitydueOctober2023TermLoanBFacility, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:SecuredDebt


Debt
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value350350350350350350350350347347349349351
Percentage of DebtInstrumentFairValue0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtInstrumentFairValue us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType

us-gaap:CarryingReportedAmountFairValueDisclosure, cwst:FixedRateBonds


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value162162162162122122122122122122121122122107106107107107101448
Percentage of DebtInstrumentFairValue0.00.00.00.00.00.0453.50.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure, cwst:FixedRateBonds


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value179173174169125120131131128124122123108106106104460
Percentage of DebtInstrumentFairValue0.00.00.00.00.00.0488.30.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtWeightedAverageInterestRate us-gaap:LongtermDebtType

us-gaap:DebtWeightedAverageInterestRate

cwst:NotesPayable


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3.43.43.53.50.0350.0350.0350.0350.0340.0290.02970.02970.029
Percentage of DebtWeightedAverageInterestRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredFinanceCostsNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value7.6258.1978.7689.348.3628.8899.4069.22610
Percentage of DeferredFinanceCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cwst:FinanceAuthorityOfMaineSolidWasteDisposalRevenueBondsSeries2015R1, us-gaap:UnsecuredDebt


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.4520.4650.4820.50.552
Percentage of DeferredFinanceCostsNet5.95.75.55.45.9

cwst:FinanceAuthorityOfMaineSolidWasteDisposalRevenueBondsSeries2015R2, us-gaap:UnsecuredDebt


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.3040.3240.3430.3620.417
Percentage of DeferredFinanceCostsNet4.04.03.93.94.4

cwst:FinanceAuthorityofMaineSolidWasteDisposalRevenueBondsSeries2005R3FAMEBonds2005R3, us-gaap:UnsecuredDebt


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.3050.3250.3470.3680.432
Percentage of DeferredFinanceCostsNet4.04.04.03.94.6

cwst:LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandThirtySix, us-gaap:UnsecuredDebt


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.460.4730.4870.50.541
Percentage of DeferredFinanceCostsNet6.05.85.65.45.8

cwst:RevenueBondSeriesTwoThousandFourteenRTwoDueTwoThousandFortyFour, us-gaap:UnsecuredDebt


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.2980.3140.3290.3440.39
Percentage of DeferredFinanceCostsNet3.93.83.83.74.1

cwst:RevenueBondSeriesTwoThousandThirteenDueTwoThousandTwentyNine, us-gaap:UnsecuredDebt


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.4480.4660.480.4950.539
Percentage of DeferredFinanceCostsNet5.95.75.55.35.7

cwst:RevenueBondsSeries2020DueSeptember2050, us-gaap:UnsecuredDebt


Deferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value1.3721.4171.4611.505
Percentage of DeferredFinanceCostsNet18.017.316.716.1

cwst:RevenueBondsSeriesTwoThousandFourteenDueTwoThousandFortyFour, us-gaap:UnsecuredDebt


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value0.9670.9841.01.0171.057
Percentage of DeferredFinanceCostsNet12.712.011.410.911.2

us-gaap:DeferredFinanceCostsNet us-gaap:LongtermDebtType

cwst:CreditFacility


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value3.0193.4293.8394.2494.6595.0695.4785.8897.118
Percentage of DeferredFinanceCostsNet39.641.843.845.555.757.058.263.865.0

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxAssetsNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value5357617.397.3667.2598.5778.849.169.4729.594101010110.0
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-30
Value2023222130292828
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsDerivativeInstruments

us-gaap:DeferredTaxAssetsDerivativeInstruments


Deferred
Period End2020-12-312019-12-312018-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value3798000.01768000.0071000.0672000.01115000.01852000.0688000.0
Percentage of DeferredTaxAssetsDerivativeInstruments100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value869898981211161111089370
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value3445313346364036349.724
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic us-gaap:BusinessAcquisition

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic

cwst:CompleteDisposalCompanyInc


Deferred
Period End2020-12-31
Value1756000.0
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsDomestic100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration


Deferred
Period End2020-12-31
Value46
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal


Deferred
Period End2020-12-31
Value68
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration


Deferred
Period End2020-12-31
Value92
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value2307000.02576000.03023000.02050000.02806000.02707000.02106000.01496000.0964000.0370000.0
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:StateAndLocalJurisdiction


Deferred
Period End2020-12-31
Value2060000.0
Percentage of DeferredTaxAssetsTaxCreditCarryforwards100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value6416000.06273000.06192000.05439000.04433000.03379000.02921000.02666000.02095000.01438000.0
Percentage of DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsOther

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsOther


Deferred
Period End2020-12-312019-12-31
Value8044000.08422000.0
Percentage of DeferredTaxAssetsTaxCreditCarryforwardsOther100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value2824000.01746000.02310000.01958000.01720000.01338000.01082000.01315000.01177000.01140000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value35363426323128302928
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value18222220302828282521
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-30
Value129000.0192000.073000.0145000.099000.095000.0264000.0286000.0143000.0
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-31
Value1875000.0
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0

us-gaap:DerivativeAssets us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeAssets

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value153000.0614000.06000.0412000.0820000.02159000.01351000.01055000.0401000.058000.095000.0388000.0
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAverageFixedInterestRate us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeAverageFixedInterestRate

cwst:ForwardInterestRateContract, us-gaap:CashFlowHedging


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value1.551.551.61.630.01630.0163
Percentage of DerivativeAverageFixedInterestRate100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value2.512.512.52.540.02540.02540.0250.025
Percentage of DerivativeAverageFixedInterestRate161.9161.9156.2155.8155.8155.80.00.0

us-gaap:DerivativeAverageFixedInterestRate us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

srt:ScenarioForecast, us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Derivative
Period End2021-02-28
Value0.018
Percentage of DerivativeAverageFixedInterestRate0.0

us-gaap:DerivativeBasisSpreadOnVariableRate us-gaap:Range, us-gaap:CreditFacility, us-gaap:VariableRate

us-gaap:DerivativeBasisSpreadOnVariableRate

srt:Maximum, us-gaap:LineOfCredit, us-gaap:LondonInterbankOfferedRateLIBOR


Derivative
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-06-30
Value1.51.750.01750.01750.01750.0175
Percentage of DerivativeBasisSpreadOnVariableRate100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiability

cwst:OtherAccruedLiabilities, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-31
Value4.7764.7784.774
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0

us-gaap:OtherNoncurrentLiabilities, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-31
Value3.9594.098.463
Percentage of DerivativeFairValueOfDerivativeLiability82.985.6177.3

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-31
Value8.7358.86813
Percentage of DerivativeFairValueOfDerivativeLiability182.9185.6277.3

us-gaap:DerivativeLiabilityFairValueGrossAsset us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilityFairValueGrossAsset

cwst:OtherAccruedLiabilities, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value4.7744.6944.6364.1661.8241.6861.3080.5790.3870.3260.3560.123
Percentage of DerivativeLiabilityFairValueGrossAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncurrentAssets, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-31
Value0.1530.614
Percentage of DerivativeLiabilityFairValueGrossAsset0.00.0

us-gaap:OtherNoncurrentLiabilities, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8.4639.7469.9628.863.6034.3984.1522.4331.5550.00.060.0
Percentage of DerivativeLiabilityFairValueGrossAsset177.3207.6214.9212.7197.5260.9317.4420.2401.80.016.90.0

us-gaap:DerivativeLiabilityFairValueGrossAsset us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.614131414135.427
Percentage of DerivativeLiabilityFairValueGrossAsset0.0277.3307.6314.9312.7297.5

us-gaap:DerivativeNotionalAmount us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeNotionalAmount

srt:ScenarioForecast, us-gaap:InterestRateContract, us-gaap:CashFlowHedging


Derivative
Period End2022-09-302022-06-302021-02-28
Value606065
Percentage of DerivativeNotionalAmount100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value138.34917139.945.28814107.1295.246107.9266.0054.571128.9945.914.61129.3997.5955.5798.1756.6555.8424.1366.2894.414.6026.0624.3215.1313.8443.9834.3543.9253.664.1424.0693.8413.6243.702
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

cwst:PerformanceStockUnit


Employee
Period End2021-06-302021-03-312020-09-302014-01-312013-10-312013-07-31
Value9006000.07933000.05196000.0000
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions100.0100.0100.00.00.00.0

cwst:RestrictedStockAwards


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value108000.067000.076000.084000.041000.045000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions1.20.80.01.60.00.0

us-gaap:RestrictedStockUnitsRSU


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value5315000.05558000.03751000.04684000.04892000.05148000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions59.070.10.090.10.00.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions us-gaap:Range, us-gaap:AwardType

srt:Maximum, cwst:PerformanceStockUnit


Employee
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-30
Value4597000.06282000.07356000.06051000.06009000.07096000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions0.00.00.00.00.00.0

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiability


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value343431322823181617
Percentage of FinanceLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDue


Finance
Period End2020-12-312020-09-30
Value3637
Percentage of FinanceLeaseLiabilityPaymentsDue100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive


Finance
Period End2020-12-31
Value6861000.0
Percentage of FinanceLeaseLiabilityPaymentsDueAfterYearFive100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths


Finance
Period End2020-12-312020-09-30
Value6286000.06505000.0
Percentage of FinanceLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive


Finance
Period End2020-12-31
Value5605000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearFive100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour


Finance
Period End2020-12-312020-09-30
Value5760000.05586000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearFour100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree


Finance
Period End2020-12-312020-09-30
Value5860000.05686000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearThree100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo


Finance
Period End2020-12-312020-09-30
Value6058000.05884000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearTwo100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear


Finance
Period End2020-09-30
Value1605000.0
Percentage of FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount


Finance
Period End2020-12-312020-09-30
Value4944000.05168000.0
Percentage of FinanceLeaseLiabilityUndiscountedExcessAmount100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization

us-gaap:FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization


Finance
Period End2020-12-312019-12-31
Value3924
Percentage of FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization100.0100.0

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4.04.04.24.30.0460.0470.050.0520.0520.0530.052
Percentage of FinanceLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value5149474542403836343231292928282726262525242424232222212120191818171716161515
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerLists


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value30282624232119171614131211111110109.9399.5679.1458.7248.3027.8817.4096.9366.4295.8295.4214.8214.2223.6093.0512.6122.2291.8141.5881.4831.4
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization58.657.756.755.453.952.450.848.847.145.643.941.941.040.539.939.138.337.636.836.035.133.732.731.530.328.827.025.723.721.619.216.814.913.111.09.99.38.9

us-gaap:NoncompeteAgreements


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value2120202019191818181717171717161616161616161616161515151515151515141414141414
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization41.442.343.344.646.147.649.251.252.954.456.158.159.059.560.160.961.762.463.264.064.966.367.368.569.771.273.074.376.378.480.883.285.186.989.090.190.791.1

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive


Finite
Period End2020-12-31
Value20
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value7440000.07394000.07869000.07701000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear


Finite
Period End2021-06-302021-03-312020-09-30
Value4038000.06026000.02272000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-12-31
Value8116000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value8301000.08259000.07898000.07746000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value8098000.08055000.06969000.06800000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value7183000.07138000.07208000.07027000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:FiniteLivedIntangibleAssetsGross


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value107107105104103989797776666563838363535333333333333333333333333333330282828201918
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerLists


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value80797877767271715244443719191817171616161616161616161616151515131111114.3093.4013.093
Percentage of FiniteLivedIntangibleAssetsGross74.574.574.574.474.273.273.173.167.067.167.166.050.650.650.049.348.948.147.747.748.348.248.248.248.248.148.248.247.847.847.843.740.640.640.221.217.516.5

us-gaap:NoncompeteAgreements


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value2727262626262626252121191919181717171717171717171717171717171717171717161615
Percentage of FiniteLivedIntangibleAssetsGross25.525.525.525.625.826.826.926.933.032.932.934.049.449.450.050.751.151.952.352.351.751.851.851.851.851.951.851.852.252.252.256.359.459.459.878.882.583.5

us-gaap:IncomeTaxesReceivable

us-gaap:IncomeTaxesReceivable


Income
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-30
Value336000.0229000.0274000.02228000.02193000.01251000.02789000.02602000.02464000.02254000.01849000.01424000.0959000.0522000.0719000.0718000.0618000.0654000.0716000.0736000.0660000.0651000.0653000.0664000.0526000.0554000.0411000.0462000.0465000.0608000.0637000.0791000.0128000.01209000.01190000.01167000.01281000.0
Percentage of IncomeTaxesReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrent

us-gaap:InterestPayableCurrent


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value2.0452.0022.1262.0741.7172.0942.0412.342.2092.5822.4152.6152.3022.3112.0932.2842.0392.4134.6545.153115.173125.151124.945116.135126.087126.109126.074128.3289.0979.8038.479.4498.6719.776
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateDerivativeLiabilitiesAtFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:InterestRateDerivativeLiabilitiesAtFairValue

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-31
Value8.7358.868131414135.4276.0845.463.0121.9420.3260.4160.1230.3220.3730.454
Percentage of InterestRateDerivativeLiabilitiesAtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryGross

us-gaap:InventoryGross


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-30
Value7994000.07974000.07868000.08059000.07938000.07815000.07679000.06976000.07054000.06793000.06542000.06459000.06461000.06492000.06534000.05941000.05309000.05338000.04915000.04894000.04603000.04474000.04282000.04586000.04622000.04418000.04374000.04199000.04191000.03905000.04396000.04040000.03665000.03494000.0
Percentage of InventoryGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-312020-09-30
Value1112
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2020-09-30
Value3301000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LetterOfCredit, cwst:RevolvingCreditFacilitydueOctober2021, us-gaap:LineOfCredit


Letters
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2624222225
Percentage of LettersOfCreditOutstandingAmount100.0100.0100.0100.0100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:PropertyPlantAndEquipmentByType

cwst:ClosureAndPostClosureCosts


Letters
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-30
Value0.00.00.00.00.01.01.1041.104
Percentage of LettersOfCreditOutstandingAmount0.00.00.00.00.00.00.00.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:RevolvingCreditFacility, cwst:RevolvingCreditFacilitydueOctober2021, us-gaap:LineOfCredit


Line
Period End2020-12-31
Value173
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value14109.248.5886.9485.3924.3013.5713.0482.6942.2981.981.7965.0374.9266.0145.0164.6694.6861.5621.4111.4581.4481.3061.4371.4571.6561.7360.8770.8850.4340.430.4270.8570.992731.2321.2281.2131.2971.2721.217
Percentage of LongTermDebtAndCapitalLeaseObligationsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities

us-gaap:LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value541542539539534553513527486477544516503499482484502508508500503514507
Percentage of LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive


Long
Period End2020-12-31
Value142
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-31
Value9240000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


Long
Period End2020-12-31
Value30
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-31
Value5502000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


Long
Period End2020-12-31
Value343
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2020-12-31
Value16
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0

us-gaap:LossContingencyAccrualAtCarryingValue us-gaap:LitigationCase, us-gaap:EnvironmentalRemediationSite

us-gaap:LossContingencyAccrualAtCarryingValue

cwst:CitizenGroupsAndTheResidentsLitigationCase, cwst:SouthbridgeLandfill


Loss
Period End2020-09-30
Value2000000.0
Percentage of LossContingencyAccrualAtCarryingValue100.0

us-gaap:LossContingencyEstimateOfPossibleLoss us-gaap:LitigationCase

us-gaap:LossContingencyEstimateOfPossibleLoss

cwst:OntarioCountyNewYorkClassActionLitigation


Loss
Period End2020-12-01
Value900000.0
Percentage of LossContingencyEstimateOfPossibleLoss100.0

us-gaap:MultiemployerPlansWithdrawalObligation

us-gaap:MultiemployerPlansWithdrawalObligation


Multiemployer
Period End2020-12-312019-12-312019-09-30
Value1757000.01838000.03194000.0
Percentage of MultiemployerPlansWithdrawalObligation100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312020-09-30
Value4.85.1
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:PrepaidExpenseCurrent

us-gaap:PrepaidExpenseCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value13109.289119.9068.7288.9948.4236.4336.737.3457.3846.6247.6648.2999.4747.2087.8517.9899.1868.4359.4217.678.9817.3297.0968.7638.0418.3597.1768.1497.8527.3675.7118.9618.0636.1926.0776.9766.4465.6925.856
Percentage of PrepaidExpenseCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization


Property
Period End2020-12-312019-12-31
Value900844
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization100.0100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization


Property
Period End2020-12-312019-12-31
Value510443
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization100.0100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization


Property
Period End2020-12-312019-12-31
Value14111288
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization100.0100.0

us-gaap:ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount us-gaap:ProductOrService

us-gaap:ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount

cwst:CustomerSolutions


Reporting
Period End2020-12-31
Value77.2
Percentage of ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount100.0

cwst:RecyclingRevenues


Reporting
Period End2020-12-31
Value77.2
Percentage of ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount100.0

us-gaap:ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount us-gaap:StatementBusinessSegments

cwst:EasternRegion


Reporting
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-30
Value77.20.3440.2150.8360.7460.2290.150.258
Percentage of ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount100.00.00.00.00.00.00.00.0

cwst:WesternRegion


Reporting
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-30
Value77.20.3440.2150.7460.7460.2290.2820.343
Percentage of ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount100.00.00.00.00.00.00.00.0

us-gaap:RestrictedCashAndInvestmentsNoncurrent

us-gaap:RestrictedCashAndInvestmentsNoncurrent


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-302013-01-312012-10-312012-07-312012-04-302012-01-312011-10-312011-07-312011-04-30
Value1953000.01871000.01848000.01619000.01555000.01410000.01586000.01410000.01395000.01345000.01248000.01229000.01198000.01197000.01220000.01084000.01065000.01039000.01002000.0931000.01762000.0871000.02251000.05283000.0968000.02554000.06632000.0790000.0703000.0681000.0675000.0645000.0538000.0545000.0523000.0521000.0419000.0424000.0400000.0403000.0329000.0334000.0
Percentage of RestrictedCashAndInvestmentsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashAndInvestmentsNoncurrent us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:Landfill


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-04-30
Value1953000.01871000.01848000.01619000.01555000.01410000.01586000.01410000.01395000.01345000.01248000.01229000.01198000.01197000.01220000.01084000.01065000.01039000.01002000.0931000.0914000.0871000.0903000.0783000.0826000.0821000.0813000.0681000.0
Percentage of RestrictedCashAndInvestmentsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.051.9100.040.114.885.332.112.3100.0

us-gaap:SelfInsuranceReserve

us-gaap:SelfInsuranceReserve


Self
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value16161514131110101112
Percentage of SelfInsuranceReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-10-312014-07-312014-04-302014-01-312013-10-312013-07-312013-04-30
Value319000.0327000.0307000.0422000.0411000.0421000.0393000.0625000.0627000.0554000.0686000.0940000.0943000.0952000.01091000.01139000.01149000.01201000.01099000.0951000.0959000.01178000.0962000.0988000.01024000.01570000.01048000.01052000.01036000.01077000.01283000.01291000.01304000.01088000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType, us-gaap:Vesting

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits, us-gaap:ShareBasedCompensationAwardTrancheOne


Share
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value584000.0595000.0711000.0700000.0710000.0950000.0952000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber183.1182.0168.5170.3168.6152.0151.8

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value51.150.3741.5537.4637.0136.6328.2322.3618.6819.5415.5614.6214.5314.299.819.669.637.03
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType, us-gaap:Vesting

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits, us-gaap:ShareBasedCompensationAwardTrancheOne


Share
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value51.0150.5937.6137.6237.621.919.48
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue99.8100.4100.4101.6102.697.9104.3

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant us-gaap:PlanName, us-gaap:StatementClassOfStock

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

cwst:A2016IncentivePlan, us-gaap:CommonClassA


Share
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312017-12-312016-12-31
Value947000.0950000.01104000.01102000.01361000.01615000.01930000.02489000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant us-gaap:StatementClassOfStock

us-gaap:CommonClassA


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value74000.094000.0117000.0143000.0184000.0255000.0376000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant6.76.97.27.47.40.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber


Share
Period End2021-06-302021-03-312020-09-302013-04-302012-04-302011-04-30
Value81000.081000.090000.01005.01487.01998.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-312020-09-302013-04-302012-04-302011-04-30
Value8.518.518.918.9110.4111.3311.8
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2021-06-302021-03-312020-12-312020-09-30
Value4455000.04467000.04780000.04230000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding us-gaap:AwardType

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value2020192321161210
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding us-gaap:AwardType, us-gaap:Vesting

cwst:RestrictedStockRestrictedStockUnitsAndPerformanceStockUnits, us-gaap:ShareBasedCompensationAwardTrancheOne


Sharebased
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value37373936271916
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding183.2182.2168.5170.4168.7155.4155.8

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-30
Value4455000.04467000.04780000.04230000.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value01000.01000.02000.04000.08000.08000.08000.09000.09000.0
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value1000.01000.02000.03000.0-91000.0-51000.026000.040000.041000.0-95000.0
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued

us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-04-302013-04-302012-04-30
Value01000.02000.03000.05000.092000.0143000.0116000.076000.034000.0
Percentage of UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


us-gaap:CommonStockSharesOutstanding
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
(None, 'us-gaap:CommonStock')
Common Stock Shares Outstandingus-gaap: Statement Class Of Stock, us-gaap: Statement Equity Components
Operating Margin
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Operating  Marginus-gaap: Consolidation Items, us-gaap: Statement Business Segments
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:InterestExpense
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
('us-gaap:InterestRateSwap', 'us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome', None)
Interest Expenseus-gaap: Derivative Instrument Risk, us-gaap: Reclassification Out Of Accumulated Other Comprehensive Income, us-gaap: Statement Equity Components
us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Operating Income Lossus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
(None, 'cwst:ResourceSolutionsRegion')
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service, us-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:StatementBusinessSegments
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:TimingOfTransferOfGoodOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Timing Of Transfer Of Good Or Service
us-gaap:Revenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Revenuesus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:Revenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:IntersegmentElimination', None)
Revenuesus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:Revenues
us-gaap:ProductOrService
(None,)
Revenuesus-gaap: Product Or Service
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:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:Goodwill
us-gaap:StatementBusinessSegments
(None,)
Goodwillus-gaap: Statement Business Segments
us-gaap:Goodwill
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Goodwillus-gaap: Consolidation Items, us-gaap: Statement Business Segments
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:DepreciationDepletionAndAmortization
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Depreciation Depletion And Amortizationus-gaap: Consolidation Items, us-gaap: Statement Business Segments