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Note C - Finance Receivables (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Jan. 31, 2015 | Jan. 31, 2014
Note C - Finance Receivables (Details) [Line Items] |  |
Installment Sale Contracts,Weighted Average Interest Rate | 14.90%crmt_InstallmentSaleContractsWeightedAverageInterestRate |
Finance Receivables, Number of Loan Classes | 1 crmt_FinanceReceivablesNumberOfLoanClasses |
Finance Receivables, Number of Risk Pools | 1 crmt_FinanceReceivablesNumberOfRiskPools |
Net Charge Offs as Percentage of Average Financing Receivables | 19.90%crmt_NetChargeOffsAsPercentageOfAverageFinancingReceivables | 19.80%crmt_NetChargeOffsAsPercentageOfAverageFinancingReceivables
Increase in Provision for Credit Losses (in Dollars) |  | $ 7.7 crmt_IncreaseInProvisionForCreditLosses
Collections as Percentage of Average Financing Receivables | 41.90%crmt_CollectionsAsPercentageOfAverageFinancingReceivables | 40.50%crmt_CollectionsAsPercentageOfAverageFinancingReceivables
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables | 5.20%crmt_DelinquenciesGreaterThan30DaysAsPercentageOfAverageFinancingReceivables | 5.80%crmt_DelinquenciesGreaterThan30DaysAsPercentageOfAverageFinancingReceivables
Maximum [Member] |  |
Note C - Finance Receivables (Details) [Line Items] |  |
Financing Receivable Payment Period | 36 months |
Financing Receivable Interest Rate | 19.00%crmt_FinancingReceivableInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember |
Minimum [Member] |  |
Note C - Finance Receivables (Details) [Line Items] |  |
Financing Receivable Payment Period | 18 months |
Financing Receivable Interest Rate | 11.00%crmt_FinancingReceivableInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember |

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

X
- Definition Represents delinquencies greater than 30 days as a percentage of financing receivables. + References No definition available. + Details
Name: | crmt_DelinquenciesGreaterThan30DaysAsPercentageOfAverageFinancingReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the 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 Represents the 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 Represents the interest rate on installment sale contracts. + References No definition available. + Details
Name: | crmt_FinancingReceivableInterestRate
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the payment period on installment sale contracts from the sale of used vehicles. + References No definition available. + Details
Name: | crmt_FinancingReceivablePaymentPeriod
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the increase in the provision of credit losses. + References No definition available. + Details
Name: | crmt_IncreaseInProvisionForCreditLosses
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average interest rate on installment sale contracts. + References No definition available. + Details
Name: | crmt_InstallmentSaleContractsWeightedAverageInterestRate
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |