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Note C - Finance Receivables, Net (Details) - Components of Finance Receivables (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Components of Finance Receivables [Abstract]        
Gross contract amount $ 477,305us-gaap_NotesReceivableGross $ 432,327us-gaap_NotesReceivableGross    
Less unearned finance charges (59,937)us-gaap_DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables (52,995)us-gaap_DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables    
Principal balance 417,368crmt_FinanceReceivablePrincipalBalance 379,332crmt_FinanceReceivablePrincipalBalance    
Less allowance for credit losses (93,224)us-gaap_FinancingReceivableAllowanceForCreditLosses (86,033)us-gaap_FinancingReceivableAllowanceForCreditLosses (75,345)us-gaap_FinancingReceivableAllowanceForCreditLosses (65,831)us-gaap_FinancingReceivableAllowanceForCreditLosses
Finance receivables, net $ 324,144us-gaap_NotesReceivableNet $ 293,299us-gaap_NotesReceivableNet $ 288,049us-gaap_NotesReceivableNet $ 251,103us-gaap_NotesReceivableNet