XML 48 R37.htm IDEA: XBRL DOCUMENT
v3.26.1

Description of Business (Narrative) (Details) | 3 Months Ended
--- | ---
Mar. 31, 2026 loan program
Description Of Business [Abstract] |
Number of business programs | program | 2
Original number of Consumer Loans required to group advances | 100
Additional number of Consumer Loans required to group advances | 50
Servicing fee percentage in collections | 20.00%
Number Of Consumer Loans Required To Group Advances | 50

X
- Definition Additional Number Of Consumer Loans Required To Group Advances + References No definition available. + Details
Name: | cacc_AdditionalNumberOfConsumerLoansRequiredToGroupAdvances
Namespace Prefix: | cacc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Number Of Business Programs + References No definition available. + Details
Name: | cacc_NumberOfBusinessPrograms
Namespace Prefix: | cacc_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Consumer Loans Required To Group Advances + References No definition available. + Details
Name: | cacc_NumberOfConsumerLoansRequiredToGroupAdvances
Namespace Prefix: | cacc_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Original Number Of Consumer Loans Required To Group Advances + References No definition available. + Details
Name: | cacc_OriginalNumberOfConsumerLoansRequiredToGroupAdvances
Namespace Prefix: | cacc_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Service fee income as a percentage of collections. + References No definition available. + Details
Name: | cacc_ServiceFeeIncomeAsPercentageOfCollections
Namespace Prefix: | cacc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration