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Other Income	9 Months Ended
	Sep. 30, 2020 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:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Revenue From Enrollment And Registration Fees In Program

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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