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Note B - Summary of Significant Accounting Policies (Details) - Sales (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014
Revenue from External Customer [Line Items] |  |  |  |
Sales | $ 116,406 us-gaap_SalesRevenueGoodsNet | $ 108,400 us-gaap_SalesRevenueGoodsNet | $ 349,300 us-gaap_SalesRevenueGoodsNet | $ 325,314 us-gaap_SalesRevenueGoodsNet
Sales - Used Autos [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales | 103,002 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_SalesUsedAutosMember | 97,171 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_SalesUsedAutosMember | 311,039 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_SalesUsedAutosMember | 290,221 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_SalesUsedAutosMember
Wholesales - Third Party [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales | 4,175 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_WholesalesThirdPartyMember | 3,855 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_WholesalesThirdPartyMember | 13,734 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_WholesalesThirdPartyMember | 13,078 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_WholesalesThirdPartyMember
Service Contract Sales [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales | 5,101 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_ServiceContractSalesMember | 3,758 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_ServiceContractSalesMember | 13,084 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_ServiceContractSalesMember | 11,386 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_ServiceContractSalesMember
Payment Protection Plan Revenue [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales | $ 4,128 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_PaymentProtectionPlanRevenueMember | $ 3,616 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_PaymentProtectionPlanRevenueMember | $ 11,443 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = crmt_PaymentProtectionPlanRevenueMember | $ 10,629 us-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 + Details
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