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Note C - Finance Receivables, Net - Financing Receivables Analysis (Details)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Principal collected as a percent of average finance receivables	53.10%	53.60%
Average down-payment percentage	6.40%	6.00%

X

- Definition

Average down-payment percentage

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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