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Note C - Finance Receivables (Detail) - Changes in Finance Receivables (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Oct. 31, 2012 | Oct. 31, 2011
Balance | $ 251,103 | $ 222,305
Finance receivable originations | 182,140 | 175,333
Finance receivable collections | (96,730) | (92,989)
Provision for credit losses | (45,310) | (41,157)
Losses on claims for payment protection plan | (3,292) | (2,735)
Inventory acquired in repossession and payment protection plan claims | (19,100) | (17,235)
Balance | $ 268,811 | $ 243,522

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- Definition Finance receivable collections + References No definition available. + Details
Name: | crmt_FinanceReceivableCollections
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Finance receivable originations + References No definition available. + Details
Name: | crmt_FinanceReceivableOriginations
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Inventory acquired in repossession and payment protection plan claims + References No definition available. + Details
Name: | crmt_InventoryAcquiredInRepossessionAndPaymentProtectionPlanClaims
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Losses on claims for payment protection plan + References No definition available. + Details
Name: | crmt_LossesOnClaimsForPaymentProtectionPlan
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Provision for credit losses on financing receivables + References No definition available. + Details
Name: | crmt_ProvisionForCreditLossesOnFinancingReceivables
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant