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Note C - Finance Receivables, Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Mar. 31, 2012
Financing 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
Finance Receivables, Number Of Loan Classes	1
Finance Receivables, Number Of Risk Pools	1
Net Charge Offs As Percentage of Average Finance Receivables	25.20%	24.80%
Allowance Percentage		21.50%	22.00%
Allowance for Loan and Lease Losses, Period Increase (Decrease) (in Dollars)		$ 1.5
Dellinquecies Greater Than 30 Days As Percentage Of Average Finance Receivables	5.10%	4.10%

X

- Definition

Allowance Percentage

+ References

No definition available.

+ Details

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X

- Definition

Dellinquecies Greater Than 30 Days As Percentage Of Average Finance Receivables

+ References

No definition available.

+ Details

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X

- Definition

The highest interest rate offered in the range of interest rates charged on installment sales.

+ References

No definition available.

+ Details

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X

- Definition

The lowest interest rate offered in the range of interest rates charged on installment sales.

+ References

No definition available.

+ Details

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X

- Definition

Finance Receivables, Number Of Loan Classes

+ References

No definition available.

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X

- Definition

Finance Receivables, Number Of Risk Pools

+ References

No definition available.

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X

- Definition

The highest number of monthly payments offered on an installment sale.

+ References

No definition available.

+ Details

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X

- Definition

The lowest number of monthly payments offered on an installment sale

+ References

No definition available.

+ Details

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- Details

Name:	crmt_FinancingReceivablesTextBlockAbstract
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X

- Definition

The percentage of average finance receivables charged off

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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