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

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- 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

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- 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

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- 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