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Note C - Finance Receivables (Detail) | 6 Months Ended
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Oct. 31, 2012 | Oct. 31, 2011
Finance Receivables Interest Rate Range Start | 11.00% |
Finance Receivable Interest Rate Range End | 19.00% |
Finance Receivables Payment Periods Start | 18 months |
Finance Receivables Payment Periods End | 36 months |
Finance Receivables, Number Of Loan Classes | 1 |
Finance Receivables, Number Of Risk Pools | 1 |
Net Increase In Net Charge Offs As Percentage Of Average Finance Receivables | 0.40% |
Net Charge Offs As Percentage of Average Finance Receivables | 12.40% | 12.00%
Allowance Percentage | 21.50% | 22.00%
Collections As Percentage of Average Finance Receivables | 29.40% | 31.60%
Dellinquecies Greater Than 30 Days As Percentage Of Average Finance Receivables | 4.30% | 3.90%

X
- Definition Allowance Percentage + References No definition available. + Details
Name: | crmt_AllowancePercentage
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of average finance receivables collected during the reported period. + References No definition available. + Details
Name: | crmt_CollectionsAsPercentageOfAverageFinanceReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dellinquecies Greater Than 30 Days As Percentage Of Average Finance Receivables + References No definition available. + Details
Name: | crmt_DellinqueciesGreaterThan30DaysAsPercentageOfAverageFinanceReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The highest interest rate offered in the range of interest rates charged on installment sales. + References No definition available. + Details
Name: | crmt_FinanceReceivableInterestRateRangeEnd
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The lowest interest rate offered in the range of interest rates charged on installment sales. + References No definition available. + Details
Name: | crmt_FinanceReceivablesInterestRateRangeStart
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Finance Receivables, Number Of Loan Classes + References No definition available. + Details
Name: | crmt_FinanceReceivablesNumberOfLoanClasses
Namespace Prefix: | crmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Finance Receivables, Number Of Risk Pools + References No definition available. + Details
Name: | crmt_FinanceReceivablesNumberOfRiskPools
Namespace Prefix: | crmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The highest number of monthly payments offered on an installment sale. + References No definition available. + Details
Name: | crmt_FinanceReceivablesPaymentPeriodsEnd
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The lowest number of monthly payments offered on an installment sale + References No definition available. + Details
Name: | crmt_FinanceReceivablesPaymentPeriodsStart
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of average finance receivables charged off + References No definition available. + Details
Name: | crmt_NetChargeOffsAsPercentageOfAverageFinanceReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net Increase In Net Charge Offs As Percentage Of Average Finance Receivables + References No definition available. + Details
Name: | crmt_NetIncreaseInNetChargeOffsAsPercentageOfAverageFinanceReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration