Finance Receivables - Summary of reconciliation of changes in allowance for credit losses on contracts (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Notes And Loans Receivable [Line Items]
Provision for credit losses	$ 1,395	$ 3,050	$ 2,125	$ 6,350
Finance receivables
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	5,250	11,248	6,154	11,162
Provision for credit losses	1,395	3,050	2,125	6,350
Charge-offs	(3,310)	(4,215)	(6,274)	(8,705)
Recoveries	1,127	1,386	2,457	2,662
Balance at end of period	4,462	11,469	4,462	11,469
Finance receivables | Contract Portfolio
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	5,268	10,651	6,001	10,433
Provision for credit losses	460	3,050	1,190	6,350
Charge-offs	(3,128)	(4,073)	(5,901)	(8,407)
Recoveries	1,116	1,349	2,426	2,601
Balance at end of period	3,716	10,977	3,716	10,977
Finance receivables | Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	(18)	597	153	729
Provision for credit losses	935		935
Charge-offs	(182)	(142)	(373)	(298)
Recoveries	11	37	31	61
Balance at end of period	$ 746	$ 492	$ 746	$ 492