Finance Receivables - Summary of reconciliation of changes in allowance for credit losses on contracts (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Accounts Notes And Loans Receivable [Line Items]
Provision for credit losses	$ 4,385	$ 5,426
Finance receivables
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	16,932	20,266
Provision for credit losses	4,385	5,426
Charge-offs	(6,968)	(7,139)
Recoveries	1,763	512
Balance at end of period	16,112	19,065
Finance receivables | Contract Portfolio
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	16,575	19,433
Provision for credit losses	3,980	5,227
Charge-offs	(6,811)	(7,049)
Recoveries	1,750	505
Balance at end of period	15,494	18,116
Finance receivables | Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	357	833
Provision for credit losses	405	199
Charge-offs	(157)	(90)
Recoveries	13	7
Balance at end of period	$ 618	$ 949