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Note C - Finance Receivables, Net - Average Financing Receivable Contract Terms (Details)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Average originating contract term (in months) (Month)	2 years 171 days	2 years 165 days
Portfolio weighted average contract term, including modifications (in months) (Month)	2 years 255 days	2 years 255 days

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- Definition

Average originating contract term.

+ References

No definition available.

+ Details

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Period Type:	duration

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- Definition

Portfolio weighted average contract term, including modifications.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration