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Note C - Finance Receivables (Details) - Components of Finance Receivables (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Apr. 30, 2014
Jan. 31, 2014
Apr. 30, 2013
Components of Finance Receivables [Abstract]        
Gross contract amount $ 481,945us-gaap_NotesReceivableGross $ 432,327us-gaap_NotesReceivableGross    
Less unearned finance charges (56,869)us-gaap_DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables (52,995)us-gaap_DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables    
Principal balance 425,076crmt_FinanceReceivablePrincipalBalance 379,332crmt_FinanceReceivablePrincipalBalance 400,651crmt_FinanceReceivablePrincipalBalance  
Less allowance for credit losses (95,273)us-gaap_FinancingReceivableAllowanceForCreditLosses (86,033)us-gaap_FinancingReceivableAllowanceForCreditLosses (90,942)us-gaap_FinancingReceivableAllowanceForCreditLosses (75,345)us-gaap_FinancingReceivableAllowanceForCreditLosses
Finance receivables, net $ 329,803us-gaap_NotesReceivableNet $ 293,299us-gaap_NotesReceivableNet $ 309,709us-gaap_NotesReceivableNet $ 288,049us-gaap_NotesReceivableNet