Note C - Finance Receivables (Details) - Financing Receivables Analysis	6 Months Ended
Oct. 31, 2014	Oct. 31, 2013
Financing Receivables Analysis [Abstract]
Principal collected as a percent of average finance receivables	28.20%	27.30%
Average down-payment percentage	6.80%	6.40%
Average originating contract term (in months)	27 months 12 days	27 months 15 days

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

No definition available.

Name:	crmt_PrincipalCollectedAsAPercentOfAverageFinancingReceivables
Namespace Prefix:	crmt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration