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Organization and Business (Details Textual)	12 Months Ended
	Apr. 30, 2025 dealership subsidiary
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Operating Subsidiaries | subsidiary	2
Number of Dealerships Operated | dealership	154

X

- Definition

Number of dealerships that the entity has.

+ References

No definition available.

+ Details

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

X

- Definition

Number of operating subsidiaries that the entity has.

+ References

No definition available.

+ Details

Name:	crmt_NumberOfOperatingSubsidiaries
Namespace Prefix:	crmt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration