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Note C - Finance Receivables (Details) - Financing receivables analysis | 3 Months Ended
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Jul. 31, 2013 | Jul. 31, 2012
Financing receivables analysis [Abstract] |  |
Principal collected as a percent of average finance receivables | 13.80% | 14.90%
Average down-payment percentage | 6.60% | 7.20%
Average originating contract term (in months) | 27 months 21 days | 26 months 21 days
Portfolio weighted average contract term, including modifications (in months) | 29 months 15 days | 28 months 3 days

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

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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
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