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Note C - Finance Receivables (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 13 Months Ended
--- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014
Receivables [Abstract] |  |  |
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 |  |
Installment Sale Contracts,Weighted Average Interest Rate | 14.90% |  |
Finance Receivables, Number Of Loan Classes | 1 |  |
Finance Receivables, Number Of Risk Pools | 1 |  |
Net Charge Offs As Percentage of Average Finance Receivables | 19.80% | 18.10% |
Accounts Receivable Allowance For Credit Losses Percentage | 23.50% | 21.50% | 23.50%
Financing Receivable, Allowance for Credit Losses, Write-downs (in Dollars) | $ 7.7 |  | $ 7.7
Financing Receivable Allowance For Credit Losses Net Of Tax Effects (in Dollars) | $ 4.9 |  |
Collections As Percentage of Average Finance Receivables | 40.50% | 42.80% |
Dellinquecies Greater Than 30 Days As Percentage Of Average Finance Receivables | 5.80% | 6.00% | 5.80%

X
- Definition Accounts receivable allowance for credit losses percentage. + References No definition available. + Details
Name: | crmt_AccountsReceivableAllowanceForCreditLossesPercentage
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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: | instant

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 Amount of increase (decrease) of allowance reserve for credit loss, net of tax effects. + References No definition available. + Details
Name: | crmt_FinancingReceivableAllowanceForCreditLossesNetOfTaxEffects
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | crmt_InstallmentSaleContractsWeightedAverageInterestRate
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
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 Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration