Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Total	$ 0	$ 127,482
Finance receivables	0	128,170
Chapter 13 bankruptcy | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Finance receivables	0	688
Direct Loans
Accounts Notes And Loans Receivable [Line Items]
Total	8,319
Direct Loans | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Total	0	18,654
Finance receivables	0	18,752
Direct Loans | Chapter 13 bankruptcy | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Finance receivables	0	98
Performing accounts | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Total	0	118,782
Performing accounts | Direct Loans | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Total	0	16,926
Non-performing accounts | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Total	0	8,700
Non-performing accounts | Direct Loans | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Total	0	1,728
Contract Portfolio
Accounts Notes And Loans Receivable [Line Items]
Total	62,664
Contract Portfolio | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Total	0	108,828
Finance receivables	0	109,418
Contract Portfolio | Chapter 13 bankruptcy | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Finance receivables	0	590
Contract Portfolio | Performing accounts | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Total	0	101,856
Contract Portfolio | Non-performing accounts | Finance Receivables
Accounts Notes And Loans Receivable [Line Items]
Total	$ 0	$ 6,972