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Note C - Finance Receivables (Detail)	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
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	18.10%	17.70%
Allowance Percentage	21.50%	22.00%
Collections As Percentage of Average Finance Receivables	42.80%	46.30%
Dellinquecies Greater Than 30 Days As Percentage Of Average Finance Receivables	6.00%	4.70%

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