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Note C - Finance Receivables, Net (Details) - Changes in the Finance Receivables Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Changes in the Finance Receivables Allowance for Credit Losses [Abstract]
Balance	$ 86,033us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 75,345us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 65,831us-gaap_FinancingReceivableAllowanceForCreditLosses
Provision for credit losses	120,289crmt_ProvisionForCreditLosses	119,247crmt_ProvisionForCreditLosses	96,035crmt_ProvisionForCreditLosses
Charge-offs, net of recovered collateral	(113,098)crmt_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries	(108,559)crmt_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries	(86,521)crmt_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries
Balance	$ 93,224us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 86,033us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 75,345us-gaap_FinancingReceivableAllowanceForCreditLosses

X

- Details

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

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- 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