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Note B - Summary of Significant Accounting Policies - Sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Sales	$ 520,149	$ 506,517	$ 472,569
Sales Used Autos [Member]
Sales	448,183	436,080	416,060
Wholesales Third Party [Member]
Sales	23,554	24,917	19,961
Service Contract Sales [Member]
Sales	28,668	27,323	19,758
Payment Protection Plan Revenue [Member]
Sales	$ 19,744	$ 18,197	$ 16,790

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=63488584&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: