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, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses	$ 4,597		$ 7,870	$ 12,982	$ 21,670
Finance receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	13,530	$ 19,975	19,176	16,932	20,266
Provision for credit losses	4,597		7,870	12,982	21,670
Charge-offs	(7,494)		(7,440)	(22,540)	(23,322)
Recoveries	2,639		369	5,898	1,361
Balance at end of period	13,272	16,932	19,975	13,272	19,975
Finance receivables | Contract Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	12,680	19,457	18,692	16,575	19,433
Provision for credit losses	4,597		7,743	12,177	21,655
Charge-offs	(7,350)		(7,337)	(22,057)	(22,965)
Recoveries	2,626		359	5,858	1,334
Balance at end of period	12,553	16,575	19,457	12,553	19,457
Finance receivables | Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	850	518	484	357	833
Provision for credit losses			127	805	15
Charge-offs	(144)		(103)	(483)	(357)
Recoveries	13		10	40	27
Balance at end of period	$ 719	$ 357	$ 518	$ 719	$ 518