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