Note C - Finance Receivables, Net - Financing Receivables Analysis (Details)	3 Months Ended
Jul. 31, 2021	Jul. 31, 2020
Principal collected as a percent of average finance receivables	11.50%	13.00%
Average down-payment percentage	6.90%	7.60%
Average originating contract term (in months) (Month)	38 months 24 days	32 months 12 days
Portfolio weighted average contract term, including modifications (in months) (Month)	38 months 21 days	33 months 27 days

Represents the principal collected as a percent of average finance receivables.

No definition available.

Name:	crmt_PrincipalCollectedAsAPercentOfAverageFinancingReceivables
Namespace Prefix:	crmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant