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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses	$ 4,000	$ 8,374	$ 8,385	$ 13,801
Finance receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	16,112	19,065	16,932	20,266
Provision for credit losses	4,000	8,374	8,385	13,801
Charge-offs	(8,322)	(8,742)	(15,014)	(15,883)
Recoveries	1,712	479	3,199	992
Balance at end of period	13,502	19,176	13,502	19,176
Finance receivables | Contract Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	15,494	18,116	16,575	19,433
Provision for credit losses	3,600	8,684	7,580	13,912
Charge-offs	(8,140)	(8,578)	(14,675)	(15,629)
Recoveries	1,698	470	3,172	976
Balance at end of period	12,652	18,692	12,652	18,692
Finance receivables | Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	618	949	357	833
Provision for credit losses	400	(310)	805	(111)
Charge-offs	(182)	(164)	(339)	(254)
Recoveries	14	9	27	16
Balance at end of period	$ 850	$ 484	$ 850	$ 484