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Finance Receivables - Reconciliation of changes in allowance for credit losses on direct loans (Details 3) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Current period provision $ 8,796 $ 7,599 $ 23,966 $ 18,766
Direct Loans        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 774 780 748 703
Current period provision 95 162 243 364
Losses absorbed (73) (83) (217) (224)
Recoveries 3 1 25 17
Balance at end of period $ 799 $ 860 $ 799 $ 860