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Summary of Significant Accounting Policies (Detail Textuals 1) (USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Accounting Policies [Abstract]      
Amount of unearned interest, discounts and allowance for credit losses $ 143,627,000 $ 146,047,000  
Amount of gross finance receivables not accruing interest 4,132,000 2,572,000 2,035,000
Cash paid for income taxes 11,273,000 13,764,000 12,068,000
Cash paid for interest $ 5,043,000 $ 4,878,000 $ 5,720,000
Average dealer discount associated with new volume 8.54% 9.23% 9.55%