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Note C - Finance Receivables, Net - Financing Receivables Analysis (Details)	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Principal collected as a percent of average finance receivables	13.10%	12.40%
Average down-payment percentage	6.10%	6.20%
Average originating contract term (Month)	2 years 171 days	2 years 174 days

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

Average originating contract term.

+ References

No definition available.

+ Details

Name:	crmt_AverageOriginatingContractTerm
Namespace Prefix:	crmt_
Data Type:	xbrli:durationItemType
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