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Note C - Finance Receivables (Details) - Changes in the Finance Receivables Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Changes in the Finance Receivables Allowance for Credit Losses [Abstract]
Balance	$ 86,033us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 75,345us-gaap_FinancingReceivableAllowanceForCreditLosses
Provision for credit losses	89,453crmt_ProvisionForCreditLosses	91,602crmt_ProvisionForCreditLosses
Charge-offs, net of recovered collateral	(80,213)crmt_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries	(76,005)crmt_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries
Balance	$ 95,273us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 90,942us-gaap_FinancingReceivableAllowanceForCreditLosses

X

- Details

Name:	crmt_ChangesInTheFinanceReceivablesAllowanceForCreditLossesAbstract
Namespace Prefix:	crmt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of direct write-downs of financing receivables charged against the allowance, net of recoveries.

+ References

No definition available.

+ Details

Name:	crmt_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries
Namespace Prefix:	crmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the provision for credit losses.

+ References

No definition available.

+ Details

Name:	crmt_ProvisionForCreditLosses
Namespace Prefix:	crmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ 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)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant