XML 54 R42.htm IDEA: XBRL DOCUMENT
v3.24.2

Description of Business (Percentage of Consumer Loans Assigned Based on Volumes) (Details) | 3 Months Ended
--- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023
Portfolio Program [Member] |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |
Percentage of new consumer loans unit volume |  | 78.50% | 78.20% | 77.20% | 74.80% | 72.40% | 72.10%
Percentage of new consumer loans dollar volume | [1] | 77.30% | 76.60% | 75.00% | 71.70% | 68.60% | 68.10%
Purchase Program [Member] |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |
Percentage of new consumer loans unit volume |  | 21.50% | 21.80% | 22.80% | 25.20% | 27.60% | 27.90%
Percentage of new consumer loans dollar volume | [1] | 22.70% | 23.40% | 25.00% | 28.30% | 31.40% | 31.90%
[1] | Represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. Payments of Dealer Holdback (as defined below) and accelerated Dealer Holdback are not included.

X
- Definition Description Of Business [Line Items] + References No definition available. + Details
Name: | cacc_DescriptionOfBusinessLineItems
Namespace Prefix: | cacc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of new consumer loans in unit volume + References No definition available. + Details
Name: | cacc_PercentageOfNewConsumerLoansInUnitVolume
Namespace Prefix: | cacc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of new consumer loans dollar volume + References No definition available. + Details
Name: | cacc_Percentageofnewconsumerloansdollarvolume
Namespace Prefix: | cacc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | cacc_PaymentsForProceedsFromLoansReceivableProgramsAxis=cacc_PortfolioProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_PaymentsForProceedsFromLoansReceivableProgramsAxis=cacc_PurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |