XML 44 R45.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Loans Receivable (Narrative) (Details) | Mar. 31, 2014
--- | ---
Loans Receivable [Abstract] |
Age of Consumer Loans contractual payments due with no forecasted future net cash flows | 120 months

X
- Definition Period After Consumer Loans With No Forecasted Future Net Cash Flows + References No definition available. + Details
Name: | cacc_PeriodAfterConsumerLoansWithNoForecastedFutureNetCashFlows
Namespace Prefix: | cacc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration