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Note B - Summary of Significant Accounting Policies (Details) - Sales (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Revenue from External Customer [Line Items]
Sales	$ 472,569us-gaap_SalesRevenueGoodsNet	$ 434,504us-gaap_SalesRevenueGoodsNet	$ 415,740us-gaap_SalesRevenueGoodsNet
Sales - Used Autos [Member]
Revenue from External Customer [Line Items]
Sales	416,060us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_SalesUsedAutosMember	385,672us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_SalesUsedAutosMember	368,674us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_SalesUsedAutosMember
Wholesales - Third Party [Member]
Revenue from External Customer [Line Items]
Sales	19,961us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_WholesalesThirdPartyMember	18,886us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_WholesalesThirdPartyMember	19,718us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_WholesalesThirdPartyMember
Service Contract Sales [Member]
Revenue from External Customer [Line Items]
Sales	19,758us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_ServiceContractSalesMember	15,833us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_ServiceContractSalesMember	14,594us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_ServiceContractSalesMember
Payment Protection Plan Revenue [Member]
Revenue from External Customer [Line Items]
Sales	$ 16,790us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_PaymentProtectionPlanRevenueMember	$ 14,113us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_PaymentProtectionPlanRevenueMember	$ 12,754us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_PaymentProtectionPlanRevenueMember

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- 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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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