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Finance Receivables - Summary of reconciliation of changes in allowance for credit losses on contracts (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Current period provision $ 8,989 $ 8,796 $ 28,887 $ 23,966
Contracts        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 19,967 12,925 16,885 12,265
Current period provision 8,818 8,701 28,498 23,723
Losses absorbed (8,745) (8,247) (26,372) (23,815)
Recoveries 360 570 1,389 1,776
Balance at end of period 20,400 13,949 20,400 13,949
Direct Loans        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 782 774 773 748
Current period provision 171 95 389 243
Losses absorbed (172) (73) (395) (217)
Recoveries 6 3 20 25
Balance at end of period $ 787 $ 799 $ 787 $ 799