Finance Receivables - Summary of reconciliation of changes in allowance for credit losses on contracts (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Provision for credit losses	$ 3,300	$ 4,385
Finance receivables
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	11,162	16,932
Provision for credit losses	3,300	4,385
Charge-offs	(4,489)	(6,968)
Recoveries	1,275	1,763
Balance at end of period	11,248	16,112
Finance receivables | Contract Portfolio
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	10,433	16,575
Provision for credit losses	3,300	3,980
Charge-offs	(4,334)	(6,811)
Recoveries	1,252	1,750
Balance at end of period	10,651	15,494
Finance receivables | Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	729	357
Provision for credit losses		405
Charge-offs	(155)	(157)
Recoveries	23	13
Balance at end of period	$ 597	$ 618