Note C - Finance Receivables, Net - Financing Receivables Analysis (Details)	12 Months Ended
Apr. 30, 2019	Apr. 30, 2018
Principal collected as a percent of average finance receivables	55.30%	53.10%
Average down-payment percentage	6.50%	6.40%

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:	instant