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Note B - Sales (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Sales Used Autos [Member]
Sales	$ 98,836	$ 106,914	$ 208,094	$ 208,037
Wholesales Third Party [Member]
Sales	6,172	4,763	11,842	9,559
Service Contract Sales [Member]
Sales	6,731	3,988	13,543	7,983
Payment Protection Plan Revenue [Member]
Sales	5,931	3,770	11,786	7,315
Sales	$ 117,670	$ 119,435	$ 245,265	$ 232,894

X

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1(a))



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueGoodsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_ProductOrServiceAxis=crmt_SalesUsedAutosMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=crmt_WholesalesThirdPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=crmt_ServiceContractSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=crmt_PaymentProtectionPlanRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: