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Debt (Schedule of Outstanding Debt Amount) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mar. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Balance outstanding $ 0us-gaap_LineOfCredit   $ 119.5us-gaap_LineOfCredit
Balance outstanding 1,435.3us-gaap_SecuredDebt   1,333.0us-gaap_SecuredDebt
Balance outstanding 548.2us-gaap_SeniorLongTermNotes   300.0us-gaap_SeniorLongTermNotes
Restricted cash and cash equivalents pledged as collateral 198.9us-gaap_RestrictedCashAndCashEquivalents   157.6us-gaap_RestrictedCashAndCashEquivalents
Revolving Secured Line of Credit [Member]      
Debt Instrument [Line Items]      
Balance outstanding 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
  119.5us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Amount available for borrowing 235.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
[1]   115.5us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
[1]
Interest rate 2.05%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
  2.16%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Warehouse Facility II [Member]      
Debt Instrument [Line Items]      
Balance outstanding 0us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
  81.3us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
Amount available for borrowing 325.0cacc_DebtInstrumentAmountAvailableForBorrowing
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
[1]   243.7cacc_DebtInstrumentAmountAvailableForBorrowing
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
[1]
Loans pledged as collateral 0us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
  104.1us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
Restricted cash and cash equivalents pledged as collateral 1.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
  2.0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
Senior notes yield to maturity 2.17%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
  2.16%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIIMember
Warehouse Facility IV [Member]      
Debt Instrument [Line Items]      
Balance outstanding     19.9us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
Amount available for borrowing 75.0cacc_DebtInstrumentAmountAvailableForBorrowing
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
[1]   55.1cacc_DebtInstrumentAmountAvailableForBorrowing
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
[1]
Loans pledged as collateral     44.9us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
Restricted cash and cash equivalents pledged as collateral 1.0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
  1.4us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
Senior notes yield to maturity 2.18%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
  2.17%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember
Warehouse Facility V [Member]      
Debt Instrument [Line Items]      
Balance outstanding 29.0us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
  17.9us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
Amount available for borrowing 46.0cacc_DebtInstrumentAmountAvailableForBorrowing
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
[1]   57.1cacc_DebtInstrumentAmountAvailableForBorrowing
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
[1]
Loans pledged as collateral 97.2us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
  34.9us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
Restricted cash and cash equivalents pledged as collateral 1.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
  1.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
Senior notes yield to maturity 1.77%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
  1.77%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember
Term ABS 2012-1 [Member]      
Debt Instrument [Line Items]      
Balance outstanding 0us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
  43.8us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
Loans pledged as collateral 0us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
  145.1us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
Restricted cash and cash equivalents pledged as collateral 0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
  19.3us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
Senior notes yield to maturity 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
  3.04%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember
Term ABS 2012-2 [Member]      
Debt Instrument [Line Items]      
Balance outstanding 119.6us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
  184.0us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
Loans pledged as collateral 247.8us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
  278.6us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
Restricted cash and cash equivalents pledged as collateral 31.9us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
  27.8us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
Senior notes yield to maturity 1.76%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
  1.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember
Term ABS 2013-1 [Member]      
Debt Instrument [Line Items]      
Balance outstanding 140.3us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
  140.3us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
Loans pledged as collateral 190.6us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
  186.7us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
Restricted cash and cash equivalents pledged as collateral 20.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
  16.7us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
Senior notes yield to maturity 1.31%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
  1.31%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember
Term ABS 2013-2 [Member]      
Debt Instrument [Line Items]      
Balance outstanding 197.8us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember
  197.8us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember
Loans pledged as collateral 252.5us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember
  248.9us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember
Restricted cash and cash equivalents pledged as collateral 26.3us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember
  21.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember
Senior notes yield to maturity 1.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember
  1.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredfinancingsTwoThousandThirteenTwoMember
Term ABS 2014-1 [Member]      
Debt Instrument [Line Items]      
Balance outstanding 299.0us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember
  299.0us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember
Loans pledged as collateral 402.3us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember
  426.2us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember
Restricted cash and cash equivalents pledged as collateral 38.0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember
  31.6us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember
Senior notes yield to maturity 1.72%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember
  1.72%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember
Term ABS 2014-2 [Member]      
Debt Instrument [Line Items]      
Balance outstanding 349.0us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember
  349.0us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember
Loans pledged as collateral 444.4us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember
  440.7us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember
Restricted cash and cash equivalents pledged as collateral 44.4us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember
  36.2us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember
Senior notes yield to maturity 2.05%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember
  2.05%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember
Term ABS 2015-1 [Member]      
Debt Instrument [Line Items]      
Balance outstanding 300.6us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFifteenOneMember
   
Loans pledged as collateral 388.1us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFifteenOneMember
   
Restricted cash and cash equivalents pledged as collateral 32.6us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFifteenOneMember
   
Senior notes yield to maturity 2.26%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFifteenOneMember
   
2021 Senior Notes [Member]      
Debt Instrument [Line Items]      
Balance outstanding 300.0us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember
  300.0us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember
Senior notes yield to maturity 6.125%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember
  6.125%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyOneSeniorNotesMember
2023 Senior Notes [Member]      
Debt Instrument [Line Items]      
Balance outstanding $ 248.2us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember
[2]   $ 0us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember
[2]
Senior notes yield to maturity 7.375%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember
7.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember
0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cacc_TwoThousandTwentyThreeSeniorNotesMember
[1] Availability may be limited by the amount of assets pledged as collateral.
[2] As of March 31, 2015 the outstanding balance presented for the 2023 Senior Notes includes an unamortized debt discount of $1.8 million.