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v3.22.1

Other Income | 9 Months Ended
--- | ---
Sep. 30, 2021 USD ($)
Other Income and Expenses [Abstract] |
Payment Holdback Percentage | 50.00%
One-time enrollment fee in program | $ 9,850

X
- Definition Payment Holdback Percentage + References No definition available. + Details
Name: | cacc_PaymentHoldbackPercentage
Namespace Prefix: | cacc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue From Enrollment And Registration Fees In Program + References No definition available. + Details
Name: | cacc_RevenueFromEnrollmentAndRegistrationFeesInProgram
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration