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Note C - Finance Receivables (Details) - Financing Receivables Analysis | 9 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014
Financing Receivables Analysis [Abstract] |  |
Principal collected as a percent of average finance receivables | 41.90%crmt_PrincipalCollectedAsAPercentOfAverageFinancingReceivables | 40.50%crmt_PrincipalCollectedAsAPercentOfAverageFinancingReceivables
Average down-payment percentage | 6.20%crmt_AverageDownpaymentPercentage | 5.60%crmt_AverageDownpaymentPercentage
Average originating contract term (in months) | 27 months 15 days | 27 months 12 days

X
- 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