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Note C - Finance Receivables (Details) - Financing Receivables Analysis | 6 Months Ended
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Oct. 31, 2014 | Oct. 31, 2013
Financing Receivables Analysis [Abstract] |  |
Principal collected as a percent of average finance receivables | 28.20% | 27.30%
Average down-payment percentage | 6.80% | 6.40%
Average originating contract term (in months) | 27 months 12 days | 27 months 15 days

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- Definition Represents the 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

X
- Definition Represents the average originating contract term. + References No definition available. + Details
Name: | crmt_AverageOriginatingContractTerm
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | crmt_FinancingReceivablesAnalysisAbstract
Namespace Prefix: | crmt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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