Fair Value Disclosures - Schedule of fair value measurement inputs and valuation techniques (Details) - USD ($) $ in Thousands		9 Months Ended
		Dec. 31, 2023	Mar. 31, 2023
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Finance receivables held for sale		$ 50,306	$ 105,971
Repossessed assets held for sale		395	1,491
Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Finance receivables held for sale		50,306	105,971
Repossessed assets held for sale		$ 395	$ 1,491
Finance Receivables | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average Discount Rate	[1]	17.30%
Finance Receivables | Discounted Cash Flow | Level 3 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate		17.60%
Finance Receivables | Discounted Cash Flow | Level 3 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate		16.40%
Finance Receivables | Fair Value | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Finance receivables held for sale		$ 50,306
Repossessed Assets | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average Discount Rate	[1]	17.30%
Repossessed Assets | Discounted Cash Flow | Level 3 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate		17.60%
Repossessed Assets | Discounted Cash Flow | Level 3 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate		16.40%
Repossessed Assets | Fair Value | Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Repossessed assets held for sale		$ 395

[1] (1) Weighted averages are determined by the relative fair value of the instruments or the relative contribution to the instruments fair value.