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Revenue Recognition (Detail Textuals)
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Revenue Recognition and Deferred Revenue [Abstract]        
Interest income accrual on finance receivables suspension condition     Accrual of interest income on finance receivables is suspended when a loan enters bankruptcy status, is contractually delinquent for 61 days or more, or the collateral is repossessed, whichever is earlier. We reverse finance charge amounts previously accrued upon suspension of accrual of finance charges. Chapter 13 bankruptcy accounts are accounted for under the cost-recovery method.  
Average dealer discount associated with new volume 8.13% 6.89% 8.29% 7.23%