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Note C - Finance Receivables (Detail) - Financing receivables analysis | 6 Months Ended
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Oct. 31, 2012 | Oct. 31, 2011
Principal collected as a percent of average finance receivables | 29.40% | 31.60%
Average down-payment percentage | 6.80% | 7.10%
Average originating contract term (in months) | 27 months | 26 months 9 days
Portfolio weighted average contract term, including modifications (in months) | 28 months 9 days | 27 months 15 days

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- Definition Average down-payment percentage + References No definition available. + Details
Name: | crmt_AverageDownpaymentPercentage
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Average originating contract term + References No definition available. + Details
Name: | crmt_AverageOriginatingContractTerm
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Portfolio weighted average contract term, including modifications + References No definition available. + Details
Name: | crmt_PortfolioWeightedAverageContractTermIncludingModifications
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Principal collected as a percent of average finance receivables + References No definition available. + Details
Name: | crmt_PrincipalCollectedAsAPercentOfAverageFinanceReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration