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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	1crmt_FinanceReceivablesNumberOfLoanClasses
Finance Receivables, Number of Risk Pools	1crmt_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)		$ 7.7crmt_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: