Finance Receivables - Activity in allowance for credit losses (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Provision for credit losses	$ 40,658	$ 5,965
Finance receivables
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of year	2,949	6,154
Provision for credit losses	40,658	5,965
Charge-offs	(32,012)	(14,495)
Recoveries	5,801	5,325
Balance at end of year	17,396	2,949
Finance receivables | Indirect
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of year	1,961	6,001
Provision for credit losses	37,125	4,210
Charge-offs	(28,391)	(13,515)
Recoveries	5,570	5,265
Balance at end of year	16,265	1,961
Finance receivables | Direct
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of year	988	153
Provision for credit losses	3,533	1,755
Charge-offs	(3,621)	(980)
Recoveries	231	60
Balance at end of year	$ 1,131	$ 988