IAA


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

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued
us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesAuthorized

us-gaap:PreferredStockSharesAuthorized

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:StatementBusinessSegments

us-gaap:CostsAndExpenses
us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxExpenseBenefit
us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestExpense
us-gaap:StatementBusinessSegments

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents
us-gaap:StatementBusinessSegments
us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingIncomeLoss
us-gaap:StatementBusinessSegments

us-gaap:OtherNonoperatingIncomeExpense
us-gaap:StatementBusinessSegments

us-gaap:Revenues
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:SellingGeneralAndAdministrativeExpense
us-gaap:StatementBusinessSegments

us-gaap:Assets
us-gaap:StatementBusinessSegments

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:ReceivablesNetCurrent

us-gaap:OtherAssetsCurrent

us-gaap:NoncurrentAssets
us-gaap:StatementGeographical

us-gaap:AssetsNoncurrent

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:BusinessAcquisition
us-gaap:StatementBusinessSegments

us-gaap:IntangibleAssetsNetExcludingGoodwill
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

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:StatementScenario

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DepreciationDepletionAndAmortization
us-gaap:StatementBusinessSegments

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt
us-gaap:LongtermDebtType
us-gaap:Range, us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentInterestRateStatedPercentage

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

iaa:FinanceLeaseCost

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestPaymentOnLiability

us-gaap:FinanceLeasePrincipalPayments

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets

us-gaap:IncreaseDecreaseInBookOverdrafts

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities
us-gaap:BusinessAcquisition
us-gaap:PaymentForContingentConsiderationLiabilityInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsOfFinancingCosts

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:BusinessAcquisition
us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromStockPlans
us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType
us-gaap:PropertyPlantAndEquipmentAdditions

us-gaap:ProvisionForOtherCreditLosses

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:StatementEquityComponents
us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

iaa:AccruedAutomobileandGeneralLiabilityExpenseCurrent

iaa:AccruedMedicalBenefitsandWorkersCompensationExpenseCurrent

iaa:AreaOfLeasedLand

iaa:DeferredTaxAssetsOperatingLeaseLiability

iaa:DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset

iaa:FinanceLeaseRightOfUseAssetAccumulatedDepreciation

iaa:FinanceLeaseRightOfUseAssetGross
us-gaap:DebtInstrument
iaa:LettersofCreditOutstandingAmountReducedUnderCreditFacility

iaa:OperatingLeaseRightofUseAssetAccumulatedAmortization

iaa:OperatingLeaseRightofUseAssetGross

us-gaap:AccountsAndOtherReceivablesNetCurrent

us-gaap:AccountsReceivableGross
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulOtherReceivablesCurrent
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationContingentConsiderationLiability
us-gaap:BusinessAcquisition, us-gaap:ContingentConsiderationByType
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet

us-gaap:DebtInstrumentCarryingAmount
us-gaap:LongtermDebtType
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateEffectivePercentage
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:VariableRate

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssets

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseRightOfUseAssetAccumulatedAmortization

us-gaap:FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:IntangibleAssetsGrossExcludingGoodwill
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LettersOfCreditOutstandingAmount
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:LongTermDebtFairValue
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:OtherAccruedLiabilitiesCurrentAndNoncurrent

us-gaap:OtherPrepaidExpenseCurrent

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
us-gaap:SubsequentEventType
us-gaap:StockRepurchaseProgramAuthorizedAmount1

us-gaap:UndistributedEarningsOfForeignSubsidiaries

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Plots across concepts


IncomeStatement
Net Income Loss
Expenses
Other Nonoperating Income Expense
Balance Sheet
Intangible Assets Net Excluding Goodwill
Assets
Property Plant And Equipment Net
Current Assets
Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Liabilities Current
Current Liabilities
Long Term Debt Current
Noncurrent Liabilities
Other Liabilities Noncurrent
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Gain Loss On Sale Of Property Plant Equipment
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Common Stock Shares Issued
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:CommonStockValue ▄▄▄▄▄▄▄▄▄1.31.31.31.31.31.31.31.31.3NA0.0NANANA
us-gaap:CommonStockSharesIssued ██▆▆▄▃▂▁▁134.8134.8134.5134.4134.0133.9133.6133.5133.4NA0.0NANANA
us-gaap:CommonStockSharesAuthorized 750.0NA750.0NA750.0750.0750.0NANANA0.0NANANA
us-gaap:PreferredStockSharesAuthorized 150.0NA150.0NA150.0150.0150.0NANANA0.0NANANA
us-gaap:CommonStockSharesOutstanding ██▆▆▃▃▁134.8134.8134.5134.4134.0133.9133.6NANANA0.0NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▄▄135.3135.3NA134.8134.6135.0NA134.7134.1134.1NA134.7134.1NA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁134.8134.6NA133.9133.8133.7NA133.5133.4133.4NA133.5133.4NA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount █▁0.30.1NA0.20.40.3NA0.40.80.8NANANANA
us-gaap:EarningsPerShareBasic █▇▅▄▁▃▃▂▄▄▃▂▃▃0.610.540.470.390.250.330.340.310.380.410.350.290.370.36
us-gaap:EarningsPerShareDiluted █▇▅▄▁▃▃▂▄▄▃▂▃▃0.610.540.470.390.250.330.340.310.380.410.350.290.370.36
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
 Cost Ratio us-gaap:StatementBusinessSegments iaa:InternationalSegment▅█▆▃▁▄▃▃▄▃▃▂▁52.165.253.839.630.945.542.739.245.942.940.034.733.1NA
 Cost Ratio us-gaap:StatementBusinessSegments iaa:UnitedStatesSegment█▆▅▃▁▄▄▄▄▄▃▂▃393.0358.3329.7298.4265.9321.1313.2318.1320.5314.3295.2286.4300.1NA
 EBT Margin us-gaap:StatementBusinessSegments iaa:InternationalSegment▅█▆▃▁▄▃▃▄▃▃▂▁52.165.253.839.630.945.542.739.245.942.940.034.733.1NA
 EBT Margin us-gaap:StatementBusinessSegments iaa:UnitedStatesSegment█▆▅▃▁▄▄▄▄▄▃▂▃393.0358.3329.7298.4265.9321.1313.2318.1320.5314.3295.2286.4300.1NA
 Operating Margin us-gaap:StatementBusinessSegments iaa:InternationalSegment▅█▆▃▁▄▃▃▄▃▃▂▁52.165.253.839.630.945.542.739.245.942.940.034.733.1NA
 Operating Margin us-gaap:StatementBusinessSegments iaa:UnitedStatesSegment█▆▅▃▁▄▄▄▄▄▃▂▃393.0358.3329.7298.4265.9321.1313.2318.1320.5314.3295.2286.4300.1NA
 SG&A Ratio us-gaap:StatementBusinessSegments iaa:InternationalSegment▅█▆▃▁▄▃▃▄▃▃▂▁52.165.253.839.630.945.542.739.245.942.940.034.733.1NA
 SG&A Ratio us-gaap:StatementBusinessSegments iaa:UnitedStatesSegment█▆▅▃▁▄▄▄▄▄▃▂▃393.0358.3329.7298.4265.9321.1313.2318.1320.5314.3295.2286.4300.1NA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
 TTM Greenblatt ROC _ _█▆▅▃▁▃▃▃▃▃▂131.7109.595.184.057.875.176.575.082.983.471.8NANANA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:AllocatedShareBasedCompensationExpense ▇█▅▅▇▅▃▂▁▁▁▁▁2.62.82.02.02.42.11.51.30.91.01.01.00.9NA
us-gaap:ComprehensiveIncomeNetOfTax █▇▆▄▁▁▃▂▃▄▂▃▃85.975.570.055.935.137.148.240.046.157.041.147.046.7NA
us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization NANANA199.7185.1231.0220.8221.3227.7218.4210.9202.5201.1206.7
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService us-gaap:Product▁█51.654.4NANA26.227.8NANANANANANANANA
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService us-gaap:Service█▁197.6196.4NANA158.9203.2NANANANANANANANA
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:Product,iaa:InternationalSegment▁█24.933.4NANA10.414.8NANANANANANANANA
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:Product,iaa:UnitedStatesSegment█▁26.721.0NANA15.813.0NANANANANANANANA
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:Service,iaa:InternationalSegment▁█14.918.3NANA12.318.2NANANANANANANANA
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:Service,iaa:UnitedStatesSegment█▁182.7178.1NANA146.6185.0NANANANANANANANA
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:RelatedPartyTransactionsByRelatedParty srt:AffiliatedEntityNA0.20.30.20.20.30.20.30.20.30.20.60.7NA
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:StatementBusinessSegments iaa:InternationalSegmentNANANA27.422.733.030.727.931.929.327.024.321.5NA
 us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:StatementBusinessSegments iaa:UnitedStatesSegmentNANANA172.3162.4198.0190.1193.4195.8189.1183.9178.2179.6NA
us-gaap:CostsAndExpenses ██▆▂▁▆▅▅▅▄▃▃▃▃313.4314.0288.4000000000001254.0239.0291.5279.4282.3283.5273.8263.4258.5257.1263.4
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest █▇▅▄▁▃▃▂▄▄▃▂▃▃110.196.982.470.943.959.859.957.571.273.661.753.067.264.3
us-gaap:IncomeTaxExpenseBenefit █▇▄▄▁▃▃▃▅▅▃▂▄▃27.224.418.318.110.715.114.315.719.919.115.114.017.416.0
us-gaap:IncomeTaxesPaidNet █▁▃▇▁▁▃▄▇▂▃43.71.015.438.12.24.014.116.336.74.716.0NANANA
us-gaap:InterestExpense █▃▃▃▃▅▅▅▂▁▁▁▁▁21.913.012.913.313.816.016.617.511.99.79.89.69.79.6
us-gaap:InterestPaidNet ▅▂▆▂▆▃█▁▁▁▁18.45.119.25.620.68.329.50.10.10.1-0.3NANANA
us-gaap:NetIncomeLoss █▇▅▄▁▃▃▂▄▄▃▂▃▃82.972.564.1000000000000152.833.244.745.641.851.354.546.639.049.848.3
 us-gaap:NonoperatingIncomeExpense us-gaap:StatementBusinessSegments iaa:InternationalSegment▁█2.12.3NANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss █▆▅▃▁▃▃▃▃▃▂▁▃▃131.7109.595.184.057.875.176.575.082.983.471.862.676.173.9
us-gaap:OtherNonoperatingIncomeExpense ▅▅▄▄▂▇▃▃▄▂▁▃█▃0.30.40.20.2-0.10.70.00.00.2-0.1-0.30.00.80.0
us-gaap:Revenues █▇▅▃▁▄▄▄▄▄▃▂▃▃445.1423.5383.5338.0296.8366.6355.9357.3366.4357.2335.2321.1333.2337.3
us-gaap:SellingGeneralAndAdministrativeExpense ██▅▄▄▅▅▆▃▃▁▃▂▃43.743.437.734.934.338.036.238.933.733.628.231.731.332.6
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:Assets ██▇▆▆▅▅▅▄▄▁▁▁2672.72625.82528.92388.82273.52215.52151.22079.92010.32016.61500.21430.41416.2NA
us-gaap:LiabilitiesAndStockholdersEquity ██▆▅▄▃▂▂▁2672.72625.82528.92388.82273.52215.52151.22079.92010.3NA1500.2NANANA
us-gaap:StockholdersEquity ▅▄▃▃▂▂▂▁▁██▇▇█230.2142.269.4-3.6-67.4-103.6-137.2-186.9-228.9618.9563.2535.8548.8591.3
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:AssetsCurrent ▇█▇▅▃▂▂▁▁701.7763.8692.0618.8524.6475.8460.0426.6419.2NA453.5NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▇█▆▅▅▂▁▁▁282.1314.9232.8216.2187.086.147.149.850.9NA60.0NANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▇█▆▅▅▂▁▁▁▁▁▁▁282.1314.9232.8216.2187.086.147.149.850.955.860.053.847.3NA
us-gaap:AccountsReceivableNetCurrent ▁▆█338.0366.9374.8NANANANANANANANANANANA
us-gaap:ReceivablesNetCurrent ▅▇█▄▁▄▅▃▂338.0366.9374.8323.5274.4316.0335.9298.8284.7NA311.0NANANA
us-gaap:OtherAssetsCurrent ▅▄▅▅▁▂▃▅█30.929.131.129.822.024.326.931.237.2NA34.0NANANA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:NoncurrentAssets NANA1126.6NANANA982.8NANANA345.2NANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:USNANA1040.8NANANA923.3NANANA329.7NANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical us-gaap:NonUsNANA85.8NANANA59.5NANANA15.5NANANA
us-gaap:AssetsNoncurrent █▇▆▆▅▅▅▂▁1971.01862.01836.91770.01748.91739.71691.21408.81349.7NA701.5NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment █▇▇▆▆█▅▂▁503.2492.5481.9470.6459.6504.4438.3364.0350.9NA389.2NANANA
us-gaap:PropertyPlantAndEquipmentNet █▆▅▂▁▂▃▂▂281.0270.7259.8242.6236.2241.5246.9244.5241.4NA345.2NANANA
us-gaap:Goodwill █▆▆▅▄▄▅█▁546.7543.3542.3540.3539.2538.6541.3547.6531.5NA530.2NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill █▃▅▁▁▁▆154.4149.1150.6146.7147.0146.5151.7NANANA160.9NANANA
us-gaap:FiniteLivedIntangibleAssetsNet NANA94.6NANANANA55.662.2NA74.8NANANA
us-gaap:OperatingLeaseRightOfUseAsset █▆▆▅▅▄▃▂▁962.9879.3866.8823.7809.9796.6735.9704.8655.2NANANANANA
us-gaap:OtherAssetsNoncurrent █▄▃▃▃▃▂▁▁26.019.617.416.716.616.515.413.413.3NA10.4NANANA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:AccountsPayableCurrent ▅▅█▅▂▁▅▂▇98.6100.4122.6101.374.165.496.476.8115.8NA129.0NANANA
us-gaap:LiabilitiesCurrent ▇█▇▅▂▁▃▃▅279.6294.1282.5266.4231.7219.6243.7244.9263.7NA671.0NANANA
us-gaap:LongTermDebtCurrent NA6.04.0NA0.00.00.08.08.0NA456.6NANANA
us-gaap:OperatingLeaseLiabilityCurrent █▆▅▄▄▃▁86.380.278.175.676.073.668.6NANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▄█▂▄▅▄▁▁▂63.483.554.461.967.564.749.351.554.1NA53.6NANANA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:LiabilitiesNoncurrent ▇██▆▅▅▃▃▁2162.92189.52177.02126.02109.22099.52044.72021.91975.5NA266.0NANANA
us-gaap:LongTermDebtNoncurrent ▁▇▇▇▇▇▇██1135.61247.11248.01250.91250.01251.71254.71267.71266.8NA0.0NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet █▆▄▂▁▂▂▂▂71.369.065.763.162.163.363.763.263.7NA63.1NANANA
us-gaap:OtherLiabilitiesNoncurrent █▇▇▄▄▄▄▁▂28.224.626.717.918.818.016.89.712.0NA16.1NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent █▅▅▄▃▃▁927.8848.8836.6794.1778.3766.5709.5NANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA117.1111.6NANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA106.7102.3NANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA101.897.3NANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA98.293.5NANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA717.4647.1NANANANANANANANANANA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:StockholdersEquity ▅▄▃▃▂▂▂▁▁██▇▇█230.2142.269.4-3.6-67.4-103.6-137.2-186.9-228.9618.9563.2535.8548.8591.3
us-gaap:CommonStockValue ▄▄▄▄▄▄▄▄▄1.31.31.31.31.31.31.31.31.3NA0.0NANANA
us-gaap:AdditionalPaidInCapital █▆█▆▂▁▃▂▁11.49.312.09.01.10.03.52.00.0NA0.0NANANA
us-gaap:RetainedEarningsAccumulatedDeficit █▇▆▄▄▃▂▂▁223.1140.267.73.6-49.2-82.4-127.1-172.7-214.5NA0.0NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax █▇▆▃▂▁▄▃▄-5.6-8.6-11.6-17.5-20.6-22.5-14.9-17.5-15.7NA-13.0NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▇█▅▅▇▅▃▃▁▁▁▁▁2.62.82.02.02.42.11.41.40.91.01.01.00.9NA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:NetCashProvidedByUsedInOperatingActivities █▇▃▃▇▆▁▅█▂▂▅129.4121.344.847.9120.097.321.689.9123.236.536.476.8NANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▂▃▅███▁▆▅▃█-31.6-31.1-27.6-19.4-11.5-10.5-11.8-35.7-15.8-21.6-28.2-10.2NANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁████▅█▅▁█▇▅-131.9-8.6-1.90.3-7.7-47.0-0.2-50.5-124.1-8.0-12.2-60.3NANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▁▇▄▄█▅▃▃▂▃▂▃-32.882.116.629.2100.939.09.0-1.1-16.67.5-5.56.5NANA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:AmortizationOfFinancingCosts ▁███▆▆▃█0.81.11.11.11.01.00.91.1NANA0.0NANANA
us-gaap:DeferredIncomeTaxExpenseBenefit ▆█▇▄▁▂▃▂▄▃▂▂2.33.32.60.9-1.2-0.30.4-0.40.7-0.1-0.7-0.8NANA
us-gaap:DepreciationDepletionAndAmortization ▂▂▁▁▁▅▅▅▅▄▇▇█▇20.519.819.619.419.622.522.422.122.121.824.324.324.724.1
us-gaap:NetCashProvidedByUsedInOperatingActivities █▇▃▃▇▆▁▅█▂▂▅129.4121.344.847.9120.097.321.689.9123.236.536.476.8NANA
us-gaap:NetIncomeLoss █▇▅▄▁▃▃▂▄▄▃▂▃▃82.972.564.1000000000000152.833.244.745.641.851.354.546.639.049.848.3
us-gaap:ShareBasedCompensation ▇█▅▅▇▅▃▂▁▁▁▁2.62.82.02.02.42.11.51.30.91.01.01.0NANA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▂▃▅███▁▆▅▃█-31.6-31.1-27.6-19.4-11.5-10.5-11.8-35.7-15.8-21.6-28.2-10.2NANA
us-gaap:PaymentsToAcquireProductiveAssets ▇█▇▄▂▁▂▄▃▅▇▁27.530.327.919.811.510.612.118.915.921.628.39.7NANA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁████▅█▅▁█▇▅-131.9-8.6-1.90.3-7.7-47.0-0.2-50.5-124.1-8.0-12.2-60.3NANA
us-gaap:RepaymentsOfLongTermDebt NANA0.00.00.04.0NANA0.00.0NANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:LongtermDebtType us-gaap:LineOfCreditNANANA0.00.04.0NANANANANANANANA
  2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:CreditFacility,us-gaap:DebtInstrument,us-gaap:SubsequentEventType srt:Maximum,us-gaap:RevolvingCreditFacility,iaa:CanadianCreditFacility,us-gaap:SubsequentEventNANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:CreditFacility,us-gaap:DebtInstrument,us-gaap:SubsequentEventType srt:Minimum,us-gaap:RevolvingCreditFacility,iaa:CanadianCreditFacility,us-gaap:SubsequentEventNANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value1300000.01300000.01300000.01300000.01300000.01300000.01300000.01300000.01300000.00
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.00.00.10.10.10.10.10.10.10.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value1341341341341341331331331330.0
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:CommonStockSharesIssued us-gaap:StatementEquityComponents

us-gaap:CommonStock


Common
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value1341341341341341331331331330.00.00.00.00.00.00.0
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesAuthorized


Common
Period End2021-06-272020-12-272020-06-282020-03-292019-12-292018-12-30
Value7507507507507500.0
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.00.0

Preferred Stock Shares Authorized

us-gaap:PreferredStockSharesAuthorized

us-gaap:PreferredStockSharesAuthorized


Preferred
Period End2021-06-272020-12-272020-06-282020-03-292019-12-292018-12-30
Value1501501501501500.0
Percentage of PreferredStockSharesAuthorized100.0100.0100.0100.0100.00.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292018-12-30
Value1341341341341341331330.0
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-272021-03-282020-09-272020-06-282020-03-292019-09-292019-06-302019-03-312018-09-302018-07-01
Value135135134134135134134134134134
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-272021-03-282020-09-272020-06-282020-03-292019-09-292019-06-302019-03-312018-09-302018-07-01
Value134134133133133133133133133133
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-272021-03-282020-09-272020-06-282020-03-292019-09-292019-06-302019-03-31
Value300000.0100000.0200000.0400000.0300000.0400000.0800000.0800000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

iaa:AntidilutiveAwards


Antidilutive
Period End2021-06-272020-09-272020-06-282020-03-292019-09-292019-06-30
Value100000.0200000.0400000.0300000.0100000.00
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount33.3100.0100.0100.025.00.0

us-gaap:PerformanceShares


Antidilutive
Period End2021-06-272021-03-282019-09-29
Value200000.0100000.0300000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount66.7100.075.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value0.610.540.470.390.250.330.340.310.380.410.350.290.370.36
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value0.610.540.470.390.250.330.340.310.380.410.350.290.370.36
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value2600000.02800000.02000000.02000000.02400000.02100000.01500000.01300000.0900000.01000000.01000000.01000000.0900000.0
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.60.70.50.60.80.60.40.40.20.30.30.30.3

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

iaa:PerformanceBasedRestrictedStockUnits


Allocated
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value800000.0400000.0400000.0400000.0400000.0200000.0-300000.0300000.0200000.00-900000.0400000.0200000.0
Percentage of AllocatedShareBasedCompensationExpense30.814.320.020.016.79.5-20.023.122.20.0-90.040.022.2
Percentage of Revenues0.20.10.10.10.10.1-0.10.10.10.0-0.30.10.1
Percentage of Revenues iaa:PerformanceBasedRestrictedStockUnits0.00.00.00.00.00.00.00.00.00.00.00.00.0

iaa:RestrictedStockUnitsAndAwards


Allocated
Period End2021-06-272021-03-282020-09-272020-06-282020-03-292019-09-292019-06-30
Value1600000.02200000.01400000.01800000.01700000.01000000.0700000.0
Percentage of AllocatedShareBasedCompensationExpense61.578.670.075.081.076.977.8
Percentage of Revenues0.40.50.40.60.50.30.2
Percentage of Revenues iaa:RestrictedStockUnitsAndAwards0.00.00.00.00.00.00.0

us-gaap:EmployeeStockOption


Allocated
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-06-302019-03-31
Value200000.0200000.0200000.0200000.0200000.0200000.000
Percentage of AllocatedShareBasedCompensationExpense7.77.110.010.08.39.50.00.0
Percentage of Revenues0.00.00.10.10.10.10.00.0
Percentage of Revenues us-gaap:EmployeeStockOption0.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value85757055353748404657414746
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues19.317.818.316.511.810.113.511.212.616.012.314.614.0

Cost Of Goods And Service Excluding Depreciation Depletion And Amortization

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization


Cost
Period End2020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value199185231220221227218210202201206
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues59.162.463.062.061.962.161.162.963.160.461.3

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService

us-gaap:Product


Cost
Period End2021-06-272021-03-282020-06-282020-03-29
Value51542627
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization0.00.014.212.0
Percentage of Revenues11.612.88.87.6
Percentage of Revenues us-gaap:Product82.486.281.985.3

us-gaap:Service


Cost
Period End2021-06-272021-03-282020-06-282020-03-29
Value197196158203
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization0.00.085.888.0
Percentage of Revenues44.446.453.555.4
Percentage of Revenues us-gaap:Service51.754.560.060.8

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

us-gaap:Product, iaa:InternationalSegment


Cost
Period End2021-06-272021-03-282020-06-282020-03-29
Value24331014
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization0.00.05.66.4
Percentage of Revenues5.67.93.54.0
Percentage of Revenues us-gaap:Product iaa:InternationalSegment87.189.882.589.7

us-gaap:Product, iaa:UnitedStatesSegment


Cost
Period End2021-06-272021-03-282020-06-282020-03-29
Value26211513
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization0.00.08.55.6
Percentage of Revenues6.05.05.33.5
Percentage of Revenues us-gaap:Product iaa:UnitedStatesSegment78.581.181.480.7

us-gaap:Service, iaa:InternationalSegment


Cost
Period End2021-06-272021-03-282020-06-282020-03-29
Value14181218
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization0.00.06.67.9
Percentage of Revenues3.34.34.15.0
Percentage of Revenues us-gaap:Service iaa:InternationalSegment63.465.467.262.8

us-gaap:Service, iaa:UnitedStatesSegment


Cost
Period End2021-06-272021-03-282020-06-282020-03-29
Value182178146185
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization0.00.079.280.1
Percentage of Revenues41.042.149.450.5
Percentage of Revenues us-gaap:Service iaa:UnitedStatesSegment50.953.659.560.7

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Cost
Period End2021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value0.20.30.20.20.30.20.30.20.30.20.60.7
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization0.00.00.10.10.10.10.10.10.10.10.30.3
Percentage of Revenues0.00.10.10.10.10.10.10.10.10.10.20.2
Percentage of Revenues srt:AffiliatedEntity0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Cost
Period End2020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value27223330273129272421
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization13.712.314.313.912.614.013.412.812.010.7
Percentage of Revenues8.17.69.08.67.88.78.28.17.66.5
Percentage of Revenues iaa:InternationalSegment69.273.572.50.071.269.568.30.070.065.0

iaa:UnitedStatesSegment


Cost
Period End2020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value172162198190193195189183178179
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization86.387.785.786.187.486.086.687.288.089.3
Percentage of Revenues51.054.754.053.454.153.452.954.955.553.9
Percentage of Revenues iaa:UnitedStatesSegment57.761.161.70.060.861.160.20.062.259.8

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value313314288254239291279282283273263258257263
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues70.474.175.275.180.579.578.579.077.476.778.680.577.278.1

us-gaap:CostsAndExpenses us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Costs
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value45564431253734313634312826
Percentage of CostsAndExpenses14.418.015.412.410.812.912.311.312.912.712.111.210.3
Percentage of Revenues10.113.311.69.38.710.39.78.910.09.79.59.07.9
Percentage of Revenues iaa:InternationalSegment86.686.70.079.583.282.60.081.479.580.90.083.379.8

iaa:UnitedStatesSegment


Costs
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value268257244222213253245250247239231229230
Percentage of CostsAndExpenses85.682.084.687.689.287.187.788.787.187.387.988.889.7
Percentage of Revenues60.360.863.665.871.969.368.870.167.466.969.171.569.2
Percentage of Revenues iaa:UnitedStatesSegment68.371.90.074.680.279.10.078.777.176.10.080.276.9

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value11096827043595957717361536764
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues24.722.921.521.014.816.316.816.119.420.618.416.520.219.1

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Income
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value5.26.61.48.05.18.68.17.39.58.27.85.86.7
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest4.76.81.711.311.614.413.512.713.311.112.610.910.0
Percentage of Revenues1.21.60.42.41.72.32.32.02.62.32.31.82.0
Percentage of Revenues iaa:InternationalSegment10.010.10.020.216.518.90.018.620.719.10.016.720.2

iaa:UnitedStatesSegment


Income
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value104908162385151506165534760
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest95.393.298.388.788.485.686.587.386.788.987.489.190.0
Percentage of Revenues23.621.321.118.613.114.014.614.016.818.316.114.718.2
Percentage of Revenues iaa:UnitedStatesSegment26.725.20.021.114.615.90.015.819.320.80.016.520.2

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value2724181810151415191915141716
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.15.84.85.43.64.14.04.45.45.34.54.45.24.7

us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Income
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value1.71.70.52.8-0.32.32.32.02.62.42.31.51.9
Percentage of IncomeTaxExpenseBenefit6.27.02.715.5-2.815.216.112.713.112.615.210.710.9
Percentage of Revenues0.40.40.10.8-0.10.60.60.60.70.70.70.50.6
Percentage of Revenues iaa:InternationalSegment3.32.60.07.1-1.05.10.05.15.75.60.04.35.7

iaa:UnitedStatesSegment


Income
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value25221715111212131716121215
Percentage of IncomeTaxExpenseBenefit93.893.097.384.5102.884.883.987.386.987.484.889.389.1
Percentage of Revenues5.75.44.64.53.73.53.43.84.74.73.83.94.7
Percentage of Revenues iaa:UnitedStatesSegment6.56.30.05.14.14.00.04.35.45.30.04.45.2

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-30
Value431.015382.24.01416364.716
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.80.24.011.30.71.14.04.610.01.34.8

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value2113121313161617119.79.89.69.79.6
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues4.93.13.43.94.64.44.74.93.22.72.93.02.92.8

us-gaap:InterestExpense us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Interest
Period End2021-06-272020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value-0.1-0.10.00.0-0.10.00.00.00.00.10.00.0
Percentage of InterestExpense-0.5-0.80.00.0-0.60.00.00.00.01.00.00.0
Percentage of Revenues-0.0-0.00.00.0-0.00.00.00.00.00.00.00.0
Percentage of Revenues iaa:InternationalSegment-0.20.00.00.0-0.20.00.00.00.00.00.00.0

iaa:UnitedStatesSegment


Interest
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value2213131313161617119.79.79.69.7
Percentage of InterestExpense100.5100.0100.8100.0100.0100.6100.0100.0100.0100.099.0100.0100.0
Percentage of Revenues4.93.13.43.94.64.44.74.93.22.72.93.02.9
Percentage of Revenues iaa:UnitedStatesSegment5.63.60.04.55.25.00.05.53.73.10.03.43.2

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-30
Value185.1195.6208.3290.10.10.1-0.3
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues4.11.25.01.76.92.38.30.00.00.0-0.1

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value8272645233444541515446394948
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues18.617.116.715.611.212.212.811.714.015.313.912.114.914.3

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value3.54.90.95.25.46.35.85.36.95.85.54.34.8
Percentage of NetIncomeLoss4.26.81.49.816.314.112.712.713.510.611.811.09.6
Percentage of Revenues0.81.20.21.51.81.71.61.51.91.61.61.31.4
Percentage of Revenues iaa:InternationalSegment6.77.50.013.117.513.80.013.515.013.50.012.414.5

iaa:UnitedStatesSegment


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value79676347273839364448413445
Percentage of NetIncomeLoss95.893.298.690.283.785.987.387.386.589.488.289.090.4
Percentage of Revenues17.816.016.514.19.410.511.210.212.113.612.310.813.5
Percentage of Revenues iaa:UnitedStatesSegment20.218.90.016.010.512.00.011.513.915.50.012.115.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-30
Value827264523344454141
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.081.5
Percentage of Revenues18.617.116.715.611.212.212.811.711.4
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense us-gaap:StatementBusinessSegments

us-gaap:NonoperatingIncomeExpense

iaa:InternationalSegment


Nonoperating
Period End2021-06-272021-03-28
Value2100000.02300000.0
Percentage of NonoperatingIncomeExpense100.0100.0
Percentage of Revenues0.50.5
Percentage of Revenues iaa:InternationalSegment4.03.5

iaa:UnitedStatesSegment


Nonoperating
Period End2021-06-272021-03-28
Value-2100000.0-2300000.0
Percentage of NonoperatingIncomeExpense-100.0-100.0
Percentage of Revenues-0.5-0.5
Percentage of Revenues iaa:UnitedStatesSegment-0.5-0.6

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value131109958457757675828371627673
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues29.625.924.824.919.520.521.521.022.623.321.419.522.821.9

us-gaap:OperatingIncomeLoss us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Operating
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value7.08.79.48.15.27.98.37.39.48.28.25.86.7
Percentage of OperatingIncomeLoss5.37.99.99.69.010.510.89.711.39.811.49.38.8
Percentage of Revenues1.62.12.52.41.82.22.32.02.62.32.41.82.0
Percentage of Revenues iaa:InternationalSegment13.413.30.020.516.817.40.018.620.519.10.016.720.2

iaa:UnitedStatesSegment


Operating
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value1241008575526768677375635669
Percentage of OperatingIncomeLoss94.792.190.190.491.089.589.290.388.790.288.690.791.2
Percentage of Revenues28.023.822.322.517.718.319.218.920.121.119.017.720.8
Percentage of Revenues iaa:UnitedStatesSegment31.728.10.025.419.820.90.021.322.923.90.019.823.1

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value300000.0400000.0200000.0200000.0-100000.0700000.000200000.0-100000.0-300000.00800000.00
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.00.0
Percentage of Revenues0.10.10.10.1-0.00.20.00.00.1-0.0-0.10.00.20.0

us-gaap:OtherNonoperatingIncomeExpense us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Other
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value200000.0200000.0-100000.0-100000.0-100000.0600000.0-200000.00100000.00-300000.000
Percentage of OtherNonoperatingIncomeExpense66.750.0-50.0-50.0100.085.70.00.050.0-0.0100.00.00.0
Percentage of Revenues0.00.0-0.0-0.0-0.00.2-0.10.00.00.0-0.10.00.0
Percentage of Revenues iaa:InternationalSegment0.40.30.0-0.3-0.31.30.00.00.20.00.00.00.0

iaa:UnitedStatesSegment


Other
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value100000.0200000.0300000.0300000.00100000.0200000.00100000.0-100000.000800000.0
Percentage of OtherNonoperatingIncomeExpense33.350.0150.0150.0-0.014.30.00.050.0100.0-0.00.0100.0
Percentage of Revenues0.00.00.10.10.00.00.10.00.0-0.00.00.00.2
Percentage of Revenues iaa:UnitedStatesSegment0.00.10.00.10.00.00.00.00.0-0.00.00.00.3

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value445423383338296366355357366357335321333337
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ProductOrService

us-gaap:Product


Revenuesus-gaap:
Period End2021-06-272021-03-282020-06-282020-03-29
Value62633232
Percentage of Revenues14.114.910.88.9
Percentage of Revenues14.114.910.88.9
Percentage of Revenues us-gaap:Product100.0100.0100.0100.0

us-gaap:Service


Revenuesus-gaap:
Period End2021-06-272021-03-282020-06-282020-03-29
Value382360264334
Percentage of Revenues85.985.189.291.1
Percentage of Revenues85.985.189.291.1
Percentage of Revenues us-gaap:Service100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

us-gaap:Product, iaa:InternationalSegment


Revenuesus-gaap:
Period End2021-06-272021-03-282020-06-282020-03-29
Value28371216
Percentage of Revenues6.48.84.24.5
Percentage of Revenues6.48.84.24.5
Percentage of Revenues us-gaap:Product iaa:InternationalSegment100.0100.0100.0100.0

us-gaap:Product, iaa:UnitedStatesSegment


Revenuesus-gaap:
Period End2021-06-272021-03-282020-06-282020-03-29
Value34251916
Percentage of Revenues7.66.16.54.4
Percentage of Revenues7.66.16.54.4
Percentage of Revenues us-gaap:Product iaa:UnitedStatesSegment100.0100.0100.0100.0

us-gaap:Service, iaa:InternationalSegment


Revenuesus-gaap:
Period End2021-06-272021-03-282020-06-282020-03-29
Value23281829
Percentage of Revenues5.36.66.27.9
Percentage of Revenues5.36.66.27.9
Percentage of Revenues us-gaap:Service iaa:InternationalSegment100.0100.0100.0100.0

us-gaap:Service, iaa:UnitedStatesSegment


Revenuesus-gaap:
Period End2021-06-272021-03-282020-06-282020-03-29
Value359332246305
Percentage of Revenues80.778.583.183.2
Percentage of Revenues80.778.583.183.2
Percentage of Revenues us-gaap:Service iaa:UnitedStatesSegment100.0100.0100.0100.0

us-gaap:Revenues us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Revenuesus-gaap:
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value52655339304542394542403433
Percentage of Revenues11.715.414.011.710.412.412.011.012.512.011.910.89.9
Percentage of Revenues11.715.414.011.710.412.412.011.012.512.011.910.89.9
Percentage of Revenues iaa:InternationalSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

iaa:UnitedStatesSegment


Revenuesus-gaap:
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value393358329298265321313318320314295286300
Percentage of Revenues88.384.686.088.389.687.688.089.087.588.088.189.290.1
Percentage of Revenues88.384.686.088.389.687.688.089.087.588.088.189.290.1
Percentage of Revenues iaa:UnitedStatesSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value4343373434383638333328313132
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.810.29.810.311.610.410.210.99.29.48.49.99.49.7

us-gaap:SellingGeneralAndAdministrativeExpense us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Selling
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value3.22.93.22.41.42.92.12.43.03.63.02.93.2
Percentage of SellingGeneralAndAdministrativeExpense7.36.78.56.94.17.65.86.28.910.710.69.110.2
Percentage of Revenues0.70.70.80.70.50.80.60.70.81.00.90.91.0
Percentage of Revenues iaa:InternationalSegment6.14.45.96.14.56.44.96.16.58.47.58.49.7

iaa:UnitedStatesSegment


Selling
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value40403432323534363030252828
Percentage of SellingGeneralAndAdministrativeExpense92.793.391.593.195.992.494.293.891.189.389.490.989.8
Percentage of Revenues9.19.69.09.611.19.69.610.28.48.47.59.08.4
Percentage of Revenues iaa:UnitedStatesSegment10.311.310.510.912.410.910.911.59.69.58.510.19.4

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012017-12-31
Value26722625252823882273221521512079201020161500143014161434
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Assetsus-gaap:
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012017-12-31
Value238232187205188179187193181204144154144136
Percentage of Assets8.98.97.48.68.38.18.79.39.010.19.610.810.29.5
Percentage of Assets8.98.97.48.68.38.18.79.39.010.19.610.810.29.5
Percentage of Assets iaa:InternationalSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

iaa:UnitedStatesSegment


Assetsus-gaap:
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012017-12-31
Value24342392234121832084203619631886182918121344127612711297
Percentage of Assets91.191.192.691.491.791.991.390.791.089.989.689.289.890.5
Percentage of Assets91.191.192.691.491.791.991.390.791.089.989.689.289.890.5
Percentage of Assets iaa:UnitedStatesSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value2672262525282388227322152151207920101500
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value23014269-3.6-67.4-103.6-137.2-186.9-228.9618563535548591571547
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.65.42.7-0.2-3.0-4.7-6.4-9.0-11.430.737.537.538.80.039.80.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value-5.6-8.6-11.6-17.5-20.6-22.5-14.9-17.5-15.7-10.5-13.0-7.5-15.5-12.4-11.3-18.4
Percentage of StockholdersEquity-2.4-6.0-16.7486.130.621.710.99.46.9-1.7-2.3-1.4-2.8-2.1-2.0-3.4
Percentage of Assets-0.2-0.3-0.5-0.7-0.9-1.0-0.7-0.8-0.8-0.5-0.9-0.5-1.10.0-0.80.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value119.3129.01.10.03.52.00.00.00.00.00.00.00.00.0
Percentage of StockholdersEquity5.06.517.3-250.0-1.6-0.0-2.6-1.1-0.00.00.00.00.00.00.00.0
Percentage of Assets0.40.40.50.40.00.00.20.10.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value1.31.31.31.31.31.31.31.31.30.00.00.00.00.00.00.0
Percentage of StockholdersEquity0.60.91.9-36.1-1.9-1.3-0.9-0.7-0.60.00.00.00.00.00.00.0
Percentage of Assets0.00.00.10.10.10.10.10.10.10.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value223140673.6-49.2-82.4-127.1-172.7-214.50.00.00.00.00.00.00.0
Percentage of StockholdersEquity96.998.697.6-100.073.079.592.692.493.70.00.00.00.00.00.00.0
Percentage of Assets8.35.32.70.2-2.2-3.7-5.9-8.3-10.70.00.00.00.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value701763692618524475460426419453
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.329.127.425.923.121.521.420.520.930.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value2823142322161878647495060
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.612.09.29.18.23.92.22.42.54.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012017-12-312017-01-01
Value28231423221618786474950556053473341
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.612.09.29.18.23.92.22.42.52.84.03.83.32.30.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-272021-03-282020-12-27
Value338366374
Percentage of AccountsReceivableNetCurrent100.0100.0100.0
Percentage of Assets12.614.014.8

Receivables Net Current

us-gaap:ReceivablesNetCurrent

us-gaap:ReceivablesNetCurrent


Receivables
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value338366374323274316335298284311
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.614.014.813.512.114.315.614.414.220.7

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value30293129222426313734
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.11.21.21.01.11.31.51.92.3

Noncurrent Assets

us-gaap:NoncurrentAssets

us-gaap:NoncurrentAssets


Noncurrent
Period End2020-12-272019-12-292018-12-30
Value1126982345
Percentage of NoncurrentAssets100.0100.0100.0
Percentage of Assets44.545.723.0

us-gaap:NoncurrentAssets us-gaap:StatementGeographical

country:US


Noncurrent
Period End2020-12-272019-12-292018-12-30
Value1040923329
Percentage of NoncurrentAssets92.493.995.5
Percentage of Assets41.242.922.0
Percentage of Assets country:US0.00.00.0

us-gaap:NonUs


Noncurrent
Period End2020-12-272019-12-292018-12-30
Value855915
Percentage of NoncurrentAssets7.66.14.5
Percentage of Assets3.42.81.0
Percentage of Assets us-gaap:NonUs0.00.00.0

Assets Noncurrent

us-gaap:AssetsNoncurrent

us-gaap:AssetsNoncurrent


Assets
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value197118621836177017481739169114081349701
Percentage of AssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets73.770.972.674.176.978.578.667.767.146.8

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value503492481470459504438364350389
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.818.819.119.720.222.820.417.517.525.9

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value281270259242236241246244241345
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.510.310.310.210.410.911.511.812.023.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-302017-12-31
Value546543542540539538541547531530533
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets20.520.721.422.623.724.325.226.326.435.337.2

us-gaap:Goodwill us-gaap:BusinessAcquisition

iaa:MarisatIncDbaAutoExchange


Goodwillus-gaap:
Period End2021-06-18
Value2.5
Percentage of Goodwill0.0
Percentage of Assets0.0
Percentage of Assets iaa:MarisatIncDbaAutoExchange0.0

us-gaap:Goodwill us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Goodwillus-gaap:
Period End2020-12-272019-12-292018-12-302017-12-31
Value46454347
Percentage of Goodwill8.58.48.28.8
Percentage of Assets1.82.12.93.3
Percentage of Assets iaa:InternationalSegment24.724.130.334.4

iaa:UnitedStatesSegment


Goodwillus-gaap:
Period End2020-12-272019-12-292018-12-302017-12-31
Value496496486486
Percentage of Goodwill91.591.691.891.2
Percentage of Assets19.623.132.433.9
Percentage of Assets iaa:UnitedStatesSegment21.225.336.237.5

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292018-12-30
Value154149150146147146151160
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.85.76.06.16.56.67.110.7

us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ComputerSoftwareIntangibleAsset


Intangible
Period End2020-12-272019-12-292018-12-30
Value513729
Percentage of IntangibleAssetsNetExcludingGoodwill34.024.718.6
Percentage of Assets2.01.72.0
Percentage of Assets us-gaap:ComputerSoftwareIntangibleAsset0.00.00.0

us-gaap:CustomerRelationships


Intangible
Period End2020-12-272019-12-292018-12-30
Value425774
Percentage of IntangibleAssetsNetExcludingGoodwill28.337.846.5
Percentage of Assets1.72.75.0
Percentage of Assets us-gaap:CustomerRelationships0.00.00.0

us-gaap:TradeNames


Intangible
Period End2020-12-272019-12-29
Value5656
Percentage of IntangibleAssetsNetExcludingGoodwill37.737.5
Percentage of Assets2.22.6
Percentage of Assets us-gaap:TradeNames0.00.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-272019-09-292019-06-302018-12-30
Value94556274
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0
Percentage of Assets3.72.73.15.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-30
Value962879866823809796735704655
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.033.534.334.535.636.034.233.932.6

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LandAndBuilding


Operating
Period End2020-12-27
Value2.0
Percentage of OperatingLeaseRightOfUseAsset0.2
Percentage of Assets0.1
Percentage of Assets us-gaap:LandAndBuilding0.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value26191716161615131310
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.00.70.70.70.70.70.70.60.70.7

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value9810012210174659676115129
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.73.84.84.23.33.04.53.75.88.6

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value279294282266231219243244263671
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.511.211.211.210.29.911.311.813.144.7

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-03-282020-12-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value6.04.00.00.00.08.08.0456
Percentage of LongTermDebtCurrent100.0100.00.00.00.0100.0100.0100.0
Percentage of Assets0.20.20.00.00.00.40.430.4

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-29
Value86807875767368
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.23.13.13.23.33.33.2

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value63835461676449515453
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.43.22.22.63.02.92.32.52.73.6

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LiabilitiesNoncurrent


Liabilities
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value216221892177212621092099204420211975266
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets80.983.486.189.092.894.895.097.298.317.7

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value1135124712481250125012511254126712660.0
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets42.547.549.352.455.056.558.361.063.00.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value71696563626363636363
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.72.62.62.62.72.93.03.03.24.2

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value282426171818169.71216
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.10.91.10.70.80.80.80.50.61.1

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-29
Value927848836794778766709
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets34.732.333.133.234.234.633.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-272020-09-27
Value117111
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0
Percentage of Assets4.64.7

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-272020-09-27
Value106102
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0
Percentage of Assets4.24.3

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-272020-09-27
Value10197
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0
Percentage of Assets4.04.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-272020-09-27
Value9893
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0
Percentage of Assets3.93.9

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-272020-09-27
Value717647
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0
Percentage of Assets28.427.1

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-30
Value914869854840778740699
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.236.437.637.936.235.634.8

us-gaap:OperatingLeaseLiability us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LandAndBuilding


Operating
Period End2020-12-27
Value1.5
Percentage of OperatingLeaseLiability0.2
Percentage of Assets0.1
Percentage of Assets us-gaap:LandAndBuilding0.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-272020-09-27
Value12671203
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0
Percentage of Assets50.150.4

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-272020-09-27
Value352334
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0
Percentage of Assets14.014.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value23014269-3.6-67.4-103.6-137.2-186.9-228.9618563535548591571547
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.65.42.7-0.2-3.0-4.7-6.4-9.0-11.430.737.537.538.80.039.80.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value-5.6-8.6-11.6-17.5-20.6-22.5-14.9-17.5-15.7-10.5-13.0-7.5-15.5-12.4-11.3-18.4
Percentage of StockholdersEquity-2.4-6.0-16.7486.130.621.710.99.46.9-1.7-2.3-1.4-2.8-2.1-2.0-3.4
Percentage of Assets-0.2-0.3-0.5-0.7-0.9-1.0-0.7-0.8-0.8-0.5-0.9-0.5-1.10.0-0.80.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value119.3129.01.10.03.52.00.00.00.00.00.00.00.00.0
Percentage of StockholdersEquity5.06.517.3-250.0-1.6-0.0-2.6-1.1-0.00.00.00.00.00.00.00.0
Percentage of Assets0.40.40.50.40.00.00.20.10.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value1.31.31.31.31.31.31.31.31.30.00.00.00.00.00.00.0
Percentage of StockholdersEquity0.60.91.9-36.1-1.9-1.3-0.9-0.7-0.60.00.00.00.00.00.00.0
Percentage of Assets0.00.00.10.10.10.10.10.10.10.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-012017-12-312017-01-01
Value223140673.6-49.2-82.4-127.1-172.7-214.50.00.00.00.00.00.00.0
Percentage of StockholdersEquity96.998.697.6-100.073.079.592.692.493.70.00.00.00.00.00.00.0
Percentage of Assets8.35.32.70.2-2.2-3.7-5.9-8.3-10.70.00.00.00.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value1300000.01300000.01300000.01300000.01300000.01300000.01300000.01300000.01300000.00
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.00.00.10.10.10.10.10.10.10.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value119.3129.01.10.03.52.00.00.0
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.00.0100.0100.00.00.0
Percentage of Assets0.40.40.50.40.00.00.20.10.00.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value223140673.6-49.2-82.4-127.1-172.7-214.50.0
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets8.35.32.70.2-2.2-3.7-5.9-8.3-10.70.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value-5600000.0-8600000.0-11600000.0-17500000.0-20600000.0-22500000.0-14900000.0-17500000.0-15700000.0-13000000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.2-0.3-0.5-0.7-0.9-1.0-0.7-0.8-0.8-0.9

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value2600000.02800000.02000000.02000000.02400000.02100000.01400000.01400000.0900000.01000000.01000000.01000000.0900000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-30
Value2600000.02800000.02000000.02000000.02400000.02100000.01400000.01400000.01400000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0155.6
Percentage of Assets0.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value1291214447120972189123363676
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues29.128.611.714.240.426.56.125.233.610.210.923.9

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value-31600000.0-31100000.0-27600000.0-19400000.0-11500000.0-10500000.0-11800000.0-35700000.0-15800000.0-21600000.0-28200000.0-10200000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-7.1-7.3-7.2-5.7-3.9-2.9-3.3-10.0-4.3-6.0-8.4-3.2

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value-131900000.0-8600000.0-1900000.0300000.0-7700000.0-47000000.0-200000.0-50500000.0-124100000.0-8000000.0-12200000.0-60300000.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-29.6-2.0-0.50.1-2.6-12.8-0.1-14.1-33.9-2.2-3.6-18.8

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value-32.8821629100399.0-1.1-16.67.5-5.56.5
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-7.419.44.38.634.010.62.5-0.3-4.52.1-1.62.0

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

us-gaap:AmortizationOfFinancingCosts


Amortization
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292018-12-30
Value800000.01100000.01100000.01100000.01000000.01000000.0900000.01100000.00
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:AmortizationOfFinancingCosts us-gaap:StatementScenario

srt:ScenarioForecast


Amortization
Period End2021-06-27
Value10000000.0
Percentage of AmortizationOfFinancingCosts1250.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value2300000.03300000.02600000.0900000.0-1200000.0-300000.0400000.0-400000.0700000.0-100000.0-700000.0-800000.0
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value2019191919222222222124242424
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationDepletionAndAmortization us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Depreciation
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value2.11.91.81.71.61.71.61.61.61.81.81.71.7
Percentage of DepreciationDepletionAndAmortization10.29.69.28.88.27.67.17.27.28.37.47.06.9

iaa:UnitedStatesSegment


Depreciation
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value18171717182020202020222223
Percentage of DepreciationDepletionAndAmortization89.890.490.891.291.892.492.992.892.891.792.693.093.1

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value1291214447120972189123363676
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues29.128.611.714.240.426.56.125.233.610.210.923.9

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-012018-04-01
Value8272645233444541515446394948
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues18.617.116.715.611.212.212.811.714.015.313.912.114.914.3

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

iaa:InternationalSegment


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value3.54.90.95.25.46.35.85.36.95.85.54.34.8
Percentage of NetIncomeLoss4.26.81.49.816.314.112.712.713.510.611.811.09.6
Percentage of Revenues0.81.20.21.51.81.71.61.51.91.61.61.31.4
Percentage of Revenues iaa:InternationalSegment6.77.51.713.117.513.813.613.515.013.513.812.414.5

iaa:UnitedStatesSegment


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value79676347273839364448413445
Percentage of NetIncomeLoss95.893.298.690.283.785.987.387.386.589.488.289.090.4
Percentage of Revenues17.816.016.514.19.410.511.210.212.113.612.310.813.5
Percentage of Revenues iaa:UnitedStatesSegment20.218.919.216.010.512.012.711.513.915.513.912.115.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-30
Value827264523344454141
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.081.5
Percentage of Revenues18.617.116.715.611.212.212.811.711.4
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value2600000.02800000.02000000.02000000.02400000.02100000.01500000.01300000.0900000.01000000.01000000.01000000.0
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value-31600000.0-31100000.0-27600000.0-19400000.0-11500000.0-10500000.0-11800000.0-35700000.0-15800000.0-21600000.0-28200000.0-10200000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-7.1-7.3-7.2-5.7-3.9-2.9-3.3-10.0-4.3-6.0-8.4-3.2

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


Payments
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value27302719111012181521289.7
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value-131900000.0-8600000.0-1900000.0300000.0-7700000.0-47000000.0-200000.0-50500000.0-124100000.0-8000000.0-12200000.0-60300000.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-29.6-2.0-0.50.1-2.6-12.8-0.1-14.1-33.9-2.2-3.6-18.8

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2020-12-272020-09-272020-06-282020-03-292019-06-302019-03-31
Value0.00.00.04.00.00.0
Percentage of RepaymentsOfLongTermDebt0.00.00.0100.00.00.0

us-gaap:RepaymentsOfLongTermDebt us-gaap:LongtermDebtType

us-gaap:LineOfCredit


Repayments
Period End2020-09-272020-06-282020-03-292019-06-28
Value0.00.04.04.0
Percentage of RepaymentsOfLongTermDebt0.00.0100.00.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range, us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentInterestRateStatedPercentage

srt:Maximum, us-gaap:RevolvingCreditFacility, iaa:CanadianCreditFacility, us-gaap:SubsequentEvent


Debt
Period End2020-07-07
Value0.0345
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Maximum us-gaap:RevolvingCreditFacility iaa:CanadianCreditFacility us-gaap:SubsequentEvent0.0

srt:Minimum, us-gaap:RevolvingCreditFacility, iaa:CanadianCreditFacility, us-gaap:SubsequentEvent


Debt
Period End2020-07-07
Value0.0277
Percentage of DebtInstrumentInterestRateStatedPercentage80.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Minimum us-gaap:RevolvingCreditFacility iaa:CanadianCreditFacility us-gaap:SubsequentEvent0.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-272019-12-292019-06-28
Value30.821.5715.01
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-272019-12-292018-12-30
Value656363
Percentage of DeferredTaxLiabilities100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-272019-12-292018-12-30
Value24220556
Percentage of DeferredTaxAssetsNet100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-272019-12-292018-12-302017-12-31
Value4100000.03500000.03000000.02000000.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0

iaa:FinanceLeaseCost

iaa:FinanceLeaseCost


Finance
Period End2021-06-272021-03-282020-09-272020-06-282020-03-292019-09-29
Value3.13.53.83.93.94.4
Percentage of FinanceLeaseCost100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation


Adjustments
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-30
Value1200000.06000000.0200000.0900000.01600000.06400000.0800000.0100000.0100000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-30
Value1200000.06000000.0200000.0900000.01600000.06400000.0800000.0100000.0100000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

iaa:MarisatIncDbaAutoExchange


Business
Period End2021-06-18
Value7.3
Percentage of BusinessCombinationConsiderationTransferred1100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value1300000.0500000.01300000.0400000.0100000.0-800000.0-600000.0-4800000.0100000.0600000.0-1500000.0200000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestExpense


Finance
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-31
Value200000.0200000.0200000.0200000.0300000.0200000.00300000.0200000.0300000.0
Percentage of FinanceLeaseInterestExpense100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:FinanceLeaseInterestPaymentOnLiability

us-gaap:FinanceLeaseInterestPaymentOnLiability


Finance
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-31
Value200000.0200000.0200000.0300000.0200000.0300000.0200000.0300000.0200000.0300000.0
Percentage of FinanceLeaseInterestPaymentOnLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeasePrincipalPayments

us-gaap:FinanceLeasePrincipalPayments


Finance
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value2.83.12.93.93.73.82.82.62.75.63.44.6
Percentage of FinanceLeasePrincipalPayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:FinanceLeaseRightOfUseAssetAmortization


Finance
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-31
Value2.93.33.63.63.63.70.74.13.83.8
Percentage of FinanceLeaseRightOfUseAssetAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:GainLossOnSaleOfPropertyPlantEquipment


Gain
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value0200000.0200000.0400000.00100000.0100000.0000200000.0200000.0
Percentage of GainLossOnSaleOfPropertyPlantEquipment0.0100.0100.0100.00.0100.0100.00.00.00.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-272021-03-282020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value-15.51134119.4-21.236-4.6-5.7-3.416
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets

us-gaap:IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets


Increase
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value-24.100000000000005-8.15564-49.8-16.0343.9-52.737303.8
Percentage of IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInBookOverdrafts

us-gaap:IncreaseDecreaseInBookOverdrafts


Increase
Period End2020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value0.00.00.0-33.624-48.5-3.91.05.95.3
Percentage of IncreaseDecreaseInBookOverdrafts0.00.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value500000.0700000.00900000.0800000.01300000.0100000.01200000.0700000.0700000.0-200000.01200000.0700000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-31
Value37353634333231302827
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-31
Value35343432323124392826
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value3000000.03000000.05900000.03100000.01900000.0-7600000.02600000.0-1800000.0-5200000.02500000.0-5500000.08000000.0-3100000.0
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-302018-07-01
Value3000000.03000000.05900000.03100000.01900000.0-7600000.02600000.0-1800000.0-5200000.02500000.0-5500000.08000000.0-3100000.0
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities


Payment
Period End2020-12-27
Value0
Percentage of PaymentForContingentConsiderationLiabilityFinancingActivities0.0

us-gaap:PaymentForContingentConsiderationLiabilityInvestingActivities us-gaap:BusinessAcquisition

us-gaap:PaymentForContingentConsiderationLiabilityInvestingActivities

iaa:MarisatIncDbaAutoExchange


Payment
Period End2021-06-18
Value2000000.0
Percentage of PaymentForContingentConsiderationLiabilityInvestingActivities100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-272021-03-28
Value300000.01000000.0
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0

us-gaap:PaymentsOfFinancingCosts

us-gaap:PaymentsOfFinancingCosts


Payments
Period End2020-12-272020-09-272019-12-292019-09-292018-12-302018-09-30
Value0.00.20.00.00.00.0
Percentage of PaymentsOfFinancingCosts0.0100.00.00.00.00.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-30
Value1200000.06000000.0200000.0900000.01600000.06400000.0800000.0100000.0000
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired us-gaap:BusinessAcquisition

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

iaa:MarisatIncDbaAutoExchange


Payments
Period End2021-06-18
Value2.0
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions


Proceeds
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-30
Value300000.0100000.0900000.06100000.0300000.0800000.0900000.0700000.0000
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment


Proceeds
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value200000.0200000.0300000.0400000.00100000.0200000.00100000.00100000.0-500000.0
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment100.0100.0100.0100.00.0100.0100.00.0100.00.0100.0100.0

us-gaap:ProceedsFromStockPlans

us-gaap:ProceedsFromStockPlans


Proceeds
Period End2021-06-272021-03-282020-12-27
Value400000.0400000.0300000.0
Percentage of ProceedsFromStockPlans100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentAdditions us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

us-gaap:PropertyPlantAndEquipmentAdditions

us-gaap:LandAndBuilding, us-gaap:SubsequentEvent


Property
Period End2021-02-19
Value11
Percentage of PropertyPlantAndEquipmentAdditions100.0

us-gaap:ProvisionForOtherCreditLosses

us-gaap:ProvisionForOtherCreditLosses


Provision
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-312018-12-302018-09-30
Value-500000.0300000.0600000.0200000.02900000.0700000.0-200000.0900000.0400000.0700000.0100000.0900000.0
Percentage of ProvisionForOtherCreditLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability


Right
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-31
Value4.50.36.63.23.15.2110.00.00.0
Percentage of RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302019-03-31
Value10735663635818669471.9
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

iaa:PerformanceBasedRestrictedStockUnits


Share
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-29
Value063.71-0.4349.8540.5750.11
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStock


Share
Period End2021-06-272020-06-282020-03-292019-09-29
Value63.0942.9948.0546.97
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.0106.095.90.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-09-29
Value0.0262.350.0949.8540.5748.0546.79
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.097.9-20.9100.0100.095.90.0

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation

us-gaap:CommonStock


Shares
Period End2021-06-272021-03-282020-12-272020-09-27
Value0100000.000
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation0.0100.00.00.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock


Stock
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-09-29
Value0400000.0100000.0400000.0100000.0300000.0100000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation0.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan


Stock
Period End2021-06-272021-03-282020-09-27
Value400000.0400000.0700000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-272021-03-282020-12-272020-09-27
Value400000.0400000.0300000.0700000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.00.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation


Stock
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-09-29
Value300000.0100000.0900000.06100000.0300000.0800000.0700000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-09-29
Value300000.0100000.0900000.06100000.0300000.0800000.0700000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0

iaa:AccruedAutomobileandGeneralLiabilityExpenseCurrent

iaa:AccruedAutomobileandGeneralLiabilityExpenseCurrent


Accrued
Period End2020-12-272019-12-292018-12-30
Value1300000.01200000.01000000.0
Percentage of AccruedAutomobileandGeneralLiabilityExpenseCurrent100.0100.0100.0

iaa:AccruedMedicalBenefitsandWorkersCompensationExpenseCurrent

iaa:AccruedMedicalBenefitsandWorkersCompensationExpenseCurrent


Accrued
Period End2020-12-272019-12-292018-12-30
Value6600000.07200000.06900000.0
Percentage of AccruedMedicalBenefitsandWorkersCompensationExpenseCurrent100.0100.0100.0

iaa:AreaOfLeasedLand

iaa:AreaOfLeasedLand


Area
Period End2020-12-27
Value50.0
Percentage of AreaOfLeasedLand100.0

iaa:DeferredTaxAssetsOperatingLeaseLiability

iaa:DeferredTaxAssetsOperatingLeaseLiability


Deferred
Period End2020-12-272019-12-29
Value229197
Percentage of DeferredTaxAssetsOperatingLeaseLiability100.0100.0

iaa:DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset

iaa:DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset


Deferred
Period End2020-12-272019-12-29
Value216185
Percentage of DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset100.0100.0

iaa:FinanceLeaseRightOfUseAssetAccumulatedDepreciation

iaa:FinanceLeaseRightOfUseAssetAccumulatedDepreciation


Finance
Period End2020-09-272020-06-282020-03-292019-12-29
Value102989490
Percentage of FinanceLeaseRightOfUseAssetAccumulatedDepreciation100.0100.0100.0100.0

iaa:FinanceLeaseRightOfUseAssetGross

iaa:FinanceLeaseRightOfUseAssetGross


Finance
Period End2020-09-272020-06-282020-03-292019-12-29
Value139134131127
Percentage of FinanceLeaseRightOfUseAssetGross100.0100.0100.0100.0

iaa:LettersofCreditOutstandingAmountReducedUnderCreditFacility us-gaap:DebtInstrument

iaa:LettersofCreditOutstandingAmountReducedUnderCreditFacility

iaa:CanadianCreditFacility


Lettersof
Period End2020-09-27
Value300000.0
Percentage of LettersofCreditOutstandingAmountReducedUnderCreditFacility100.0

iaa:RevolvingCreditFacilityFiveYear


Lettersof
Period End2020-09-27
Value6200000.0
Percentage of LettersofCreditOutstandingAmountReducedUnderCreditFacility2066.7

iaa:OperatingLeaseRightofUseAssetAccumulatedAmortization

iaa:OperatingLeaseRightofUseAssetAccumulatedAmortization


Operating
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-29
Value2101861631401179675
Percentage of OperatingLeaseRightofUseAssetAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0

iaa:OperatingLeaseRightofUseAssetGross

iaa:OperatingLeaseRightofUseAssetGross


Operating
Period End2020-12-272020-09-272020-06-282020-03-292019-12-29
Value1030964927892811
Percentage of OperatingLeaseRightofUseAssetGross100.0100.0100.0100.0100.0

us-gaap:AccountsAndOtherReceivablesNetCurrent

us-gaap:AccountsAndOtherReceivablesNetCurrent


Accounts
Period End2020-12-272019-12-29
Value374335
Percentage of AccountsAndOtherReceivablesNetCurrent100.0100.0

us-gaap:AccountsReceivableGross

us-gaap:AccountsReceivableGross


Accounts
Period End2021-06-272021-03-282020-12-272019-12-29
Value345375382340
Percentage of AccountsReceivableGross100.0100.0100.0100.0

us-gaap:AccountsReceivableGross us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

iaa:AdvanceChargesReceivable


Accounts
Period End2021-06-272021-03-282020-12-272019-12-29
Value245253239219
Percentage of AccountsReceivableGross70.967.562.664.6

iaa:OtherReceivable


Accounts
Period End2021-06-272021-03-282020-12-272019-12-29
Value2.8171630
Percentage of AccountsReceivableGross0.84.64.48.9

us-gaap:TradeAccountsReceivable


Accounts
Period End2021-06-272021-03-282020-12-272019-12-29
Value9710412690
Percentage of AccountsReceivableGross28.227.933.026.5

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-302017-12-312017-01-01
Value7600000.08300000.08000000.07500000.07300000.04700000.04200000.04400000.04300000.03300000.02100000.02000000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulOtherReceivablesCurrent

us-gaap:AllowanceForDoubtfulOtherReceivablesCurrent


Allowance
Period End2020-12-272019-12-29
Value8000000.04200000.0
Percentage of AllowanceForDoubtfulOtherReceivablesCurrent100.0100.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationContingentConsiderationLiability

iaa:MarisatIncDbaAutoExchange


Business
Period End2021-06-18
Value5300000.0
Percentage of BusinessCombinationContingentConsiderationLiability100.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:BusinessAcquisition, us-gaap:ContingentConsiderationByType

iaa:MarisatIncDbaAutoExchange, iaa:AchievementofCertainPerformanceTargets


Business
Period End2021-06-18
Value3300000.0
Percentage of BusinessCombinationContingentConsiderationLiability62.3

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

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles

iaa:MarisatIncDbaAutoExchange, us-gaap:CustomerRelationships


Business
Period End2021-06-18
Value4.1
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet

iaa:MarisatIncDbaAutoExchange


Business
Period End2021-06-18
Value700000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value115012741274127412741274127813001300456
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:LongtermDebtType

iaa:A2019TermLoan


Debt
Period End2020-12-27
Value774
Percentage of DebtInstrumentCarryingAmount60.8

iaa:A2021TermLoan


Debt
Period End2021-06-27
Value650
Percentage of DebtInstrumentCarryingAmount56.5

us-gaap:LineOfCredit


Debt
Period End2021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value7747747747747747788008000.0
Percentage of DebtInstrumentCarryingAmount60.860.860.860.860.860.961.561.50.0

us-gaap:SeniorNotes


Debt
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value5005005005005005005005005000.0
Percentage of DebtInstrumentCarryingAmount43.539.239.239.239.239.239.138.538.50.0

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateEffectivePercentage

us-gaap:SecuredDebt, iaa:SeniorSecuredTermLoanFacilitySevenYear


Debt
Period End2020-12-27
Value2.44
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:VariableRate

us-gaap:SecuredDebt, iaa:SeniorSecuredTermLoanFacilitySevenYear, us-gaap:BaseRate


Debt
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-29
Value1.842.42.42.40.0240.0390.04
Percentage of DebtInstrumentInterestRateEffectivePercentage0.00.098.40.00.00.00.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet


Debt
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value1420222324222324250.0
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-272019-12-292018-12-30
Value308269119
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-272019-12-292018-12-30
Value2600000.01800000.01800000.0
Percentage of DeferredTaxAssetsOther100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits


Deferred
Period End2020-12-272019-12-292018-12-30
Value4400000.02800000.04100000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals


Deferred
Period End2020-12-272019-12-292018-12-30
Value3.92.350
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts


Deferred
Period End2020-12-272019-12-292018-12-30
Value1800000.0900000.0600000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssets


Deferred
Period End2020-12-272019-12-292018-12-30
Value646264
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssets100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-272019-12-292018-12-30
Value121111
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-272019-12-292018-12-30
Value148.843
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value31242327141529291929
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized


Employee
Period End2020-12-27
Value11
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiability


Finance
Period End2020-12-272020-09-272020-06-282020-03-292019-12-29
Value2826262525
Percentage of FinanceLeaseLiability100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityCurrent


Finance
Period End2020-12-272020-09-272020-06-282020-03-292019-12-29
Value1111111112
Percentage of FinanceLeaseLiabilityCurrent100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityNoncurrent


Finance
Period End2020-12-272020-09-272020-06-282020-03-292019-12-29
Value1714141412
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDue


Finance
Period End2020-12-272020-09-27
Value2927
Percentage of FinanceLeaseLiabilityPaymentsDue100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths


Finance
Period End2020-12-272020-09-27
Value1110
Percentage of FinanceLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive


Finance
Period End2020-12-272020-09-27
Value1700000.0800000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearFive100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour


Finance
Period End2020-12-272020-09-27
Value4000000.03100000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearFour100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree


Finance
Period End2020-12-272020-09-27
Value5000000.03800000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearThree100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo


Finance
Period End2020-12-272020-09-27
Value7300000.06100000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearTwo100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear


Finance
Period End2020-09-27
Value2700000.0
Percentage of FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseRightOfUseAsset


Finance
Period End2020-12-272020-09-272020-06-282020-03-292019-12-29
Value3536363736
Percentage of FinanceLeaseRightOfUseAsset100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetAccumulatedAmortization

us-gaap:FinanceLeaseRightOfUseAssetAccumulatedAmortization


Finance
Period End2020-12-272019-12-29
Value10890
Percentage of FinanceLeaseRightOfUseAssetAccumulatedAmortization100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization

us-gaap:FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization


Finance
Period End2020-12-272019-12-29
Value144127
Percentage of FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization100.0100.0

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent


Finance
Period End2020-12-272020-09-272020-06-282020-03-292019-12-29
Value3.33.50.0370.0380.046
Percentage of FinanceLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value525514504493484475465306300286
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ComputerSoftwareIntangibleAsset


Finite
Period End2020-12-272019-12-292018-12-30
Value173150132
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization34.432.346.0

us-gaap:CustomerRelationships


Finite
Period End2020-12-272019-12-292018-12-30
Value329313286
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization65.367.3100.0

us-gaap:TradeNames


Finite
Period End2020-12-272019-12-29
Value1.81.7
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.40.4

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive


Finite
Period End2020-12-27
Value4800000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2020-12-27
Value36
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-12-27
Value1500000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2020-12-27
Value4500000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2020-12-27
Value18
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2020-12-27
Value29
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:IntangibleAssetsGrossExcludingGoodwill


Intangible
Period End2020-12-272019-12-292018-12-30
Value654617595
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0

us-gaap:IntangibleAssetsGrossExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ComputerSoftwareIntangibleAsset


Intangible
Period End2020-12-272019-12-292018-12-30
Value224188161
Percentage of IntangibleAssetsGrossExcludingGoodwill34.330.527.2

us-gaap:CustomerRelationships


Intangible
Period End2020-12-272019-12-292018-12-30
Value371370361
Percentage of IntangibleAssetsGrossExcludingGoodwill56.860.160.7

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-272020-09-27
Value126123
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2020-09-27
Value28
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LettersOfCreditOutstandingAmount


Letters
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292019-09-292019-06-302018-12-30
Value5600000.06100000.06100000.06500000.06500000.07300000.07000000.07000000.0400000.02100000.0
Percentage of LettersOfCreditOutstandingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:RevolvingCreditFacility, iaa:CanadianCreditFacility


Line
Period End2020-07-07
Value10.0
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:RevolvingCreditFacility, iaa:CanadianCreditFacility, us-gaap:SubsequentEvent


Line
Period End2020-07-07
Value10.0
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtFairValue


Long
Period End2021-06-272021-03-282020-12-272020-09-272019-12-29
Value5231293130212781313
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0

us-gaap:LongTermDebtFairValue us-gaap:LongtermDebtType

iaa:A2019TermLoan


Long
Period End2020-12-27
Value770
Percentage of LongTermDebtFairValue59.1

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive


Long
Period End2020-12-27
Value1240
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-27
Value4000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


Long
Period End2020-12-27
Value8000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-27
Value6000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


Long
Period End2020-12-27
Value8000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2020-12-27
Value8000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-272020-09-272020-06-282020-03-292019-12-29
Value5.65.60.0560.0560.057
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0100.0

us-gaap:OtherAccruedLiabilitiesCurrentAndNoncurrent us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OtherAccruedLiabilitiesCurrentAndNoncurrent

us-gaap:LandAndBuilding


Other
Period End2020-12-27
Value800000.0
Percentage of OtherAccruedLiabilitiesCurrentAndNoncurrent100.0

us-gaap:OtherPrepaidExpenseCurrent

us-gaap:OtherPrepaidExpenseCurrent


Other
Period End2021-06-272021-03-282020-12-272020-09-272020-06-282020-03-292019-12-292018-12-30
Value5052534941495048
Percentage of OtherPrepaidExpenseCurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization


Property
Period End2020-12-272019-12-29
Value481438
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization100.0100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization


Property
Period End2020-12-272019-12-29
Value259246
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization100.0100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization


Property
Period End2020-12-272019-12-29
Value741685
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization100.0100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization us-gaap:PropertyPlantAndEquipmentByType

iaa:BuildingandLeaseholdImprovements


Property
Period End2020-12-272019-12-29
Value309293
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization41.742.9

iaa:FurnitureFixturesEquipmentandVehicles


Property
Period End2020-12-272019-12-29
Value305280
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization41.141.0

us-gaap:ConstructionInProgress


Property
Period End2020-12-272019-12-29
Value1313
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization1.82.0

us-gaap:Land


Property
Period End2020-12-272019-12-29
Value11496
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization15.414.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

iaa:PerformanceBasedRestrictedStockUnits


Share
Period End2020-12-272019-12-292018-12-30
Value49.6529.3129.27
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0

iaa:RestrictedStockAwards


Share
Period End2020-12-272019-12-292018-12-30
Value42.9946.970
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue86.6160.30.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-272019-12-292018-12-30
Value33.6830.8830.57
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue67.8105.4104.4

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2020-12-27
Value22.28
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2020-12-27
Value12
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1


Sharebased
Period End2020-12-27
Value10
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0

us-gaap:StockRepurchaseProgramAuthorizedAmount1 us-gaap:SubsequentEventType

us-gaap:StockRepurchaseProgramAuthorizedAmount1

us-gaap:SubsequentEvent


Stock
Period End2021-08-02
Value400
Percentage of StockRepurchaseProgramAuthorizedAmount1100.0

us-gaap:UndistributedEarningsOfForeignSubsidiaries

us-gaap:UndistributedEarningsOfForeignSubsidiaries


Undistributed
Period End2020-12-27
Value119
Percentage of UndistributedEarningsOfForeignSubsidiaries100.0

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued


Unrecognized
Period End2020-12-272019-12-292018-12-30
Value200000.0200000.0100000.0
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2020-12-272019-12-292018-12-30
Value3500000.03000000.02500000.0
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0100.0100.0

Line plots across dimensions of each concept


us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
(None,)
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amountus-gaap: Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities
Cost Ratio
us-gaap:StatementBusinessSegments
(None,)
Cost  Ratio us-gaap: Statement Business Segments
EBT Margin
us-gaap:StatementBusinessSegments
(None,)
E B T  Marginus-gaap: Statement Business Segments
Operating Margin
us-gaap:StatementBusinessSegments
(None,)
Operating  Marginus-gaap: Statement Business Segments
SG&A Ratio
us-gaap:StatementBusinessSegments
(None,)
S G& A  Ratious-gaap: Statement Business Segments
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType
(None,)
Allocated Share Based Compensation Expenseus-gaap: Award Type
us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization
us-gaap:StatementBusinessSegments
(None,)
Cost Of Goods And Service Excluding Depreciation Depletion And Amortizationus-gaap: Statement Business Segments
us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization
us-gaap:ProductOrService
(None,)
Cost Of Goods And Service Excluding Depreciation Depletion And Amortizationus-gaap: Product Or Service
us-gaap:CostsAndExpenses
us-gaap:StatementBusinessSegments
(None,)
Costs And Expensesus-gaap: Statement Business Segments
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:StatementBusinessSegments
(None,)
Income Loss From Continuing Operations 
Before Income Taxes Extraordinary Items Noncontrolling Interestus-gaap: Statement Business Segments
us-gaap:IncomeTaxExpenseBenefit
us-gaap:StatementBusinessSegments
(None,)
Income Tax Expense Benefitus-gaap: Statement Business Segments
us-gaap:InterestExpense
us-gaap:StatementBusinessSegments
(None,)
Interest Expenseus-gaap: Statement Business Segments
us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
(None,)
Net Income Lossus-gaap: Statement Business Segments
us-gaap:NonoperatingIncomeExpense
us-gaap:StatementBusinessSegments
(None,)
Nonoperating Income Expenseus-gaap: Statement Business Segments
us-gaap:OperatingIncomeLoss
us-gaap:StatementBusinessSegments
(None,)
Operating Income Lossus-gaap: Statement Business Segments
us-gaap:OtherNonoperatingIncomeExpense
us-gaap:StatementBusinessSegments
(None,)
Other Nonoperating Income Expenseus-gaap: Statement Business Segments
us-gaap:Revenues
us-gaap:StatementBusinessSegments
(None,)
Revenuesus-gaap: Statement Business Segments
us-gaap:Revenues
us-gaap:ProductOrService
(None,)
Revenuesus-gaap: Product Or Service
us-gaap:SellingGeneralAndAdministrativeExpense
us-gaap:StatementBusinessSegments
(None,)
Selling General And Administrative Expenseus-gaap: Statement Business Segments
us-gaap:Assets
us-gaap:StatementBusinessSegments
(None,)
Assetsus-gaap: Statement Business Segments
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:NoncurrentAssets
us-gaap:StatementGeographical
(None,)
Noncurrent Assetsus-gaap: Statement Geographical
us-gaap:Goodwill
us-gaap:StatementBusinessSegments
(None,)
Goodwillus-gaap: Statement Business Segments
us-gaap:IntangibleAssetsNetExcludingGoodwill
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
(None,)
Intangible Assets Net Excluding Goodwillus-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:StatementBusinessSegments
(None,)
Depreciation Depletion And Amortizationus-gaap: Statement Business Segments
us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
(None,)
Net Income Lossus-gaap: Statement Business Segments