Investments - Narrative (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2022 USD ($) investment	Jun. 30, 2021 USD ($)	Mar. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Net gain (loss)	$ 4,344	$ 3,455
Unrealized loss on secured borrowings, fair value adjustment	(723)	814
Investments valued under the measurement alternative	183,023		$ 156,100
Technology Drive Platform
Schedule of Equity Method Investments [Line Items]
Investments valued under the measurement alternative	3,000
Online Financial Services Platform
Schedule of Equity Method Investments [Line Items]
Investments valued under the measurement alternative	12,000
Individual Investors And Wealth Management Platform
Schedule of Equity Method Investments [Line Items]
Investments valued under the measurement alternative	$ 5,236
Private equity funds
Schedule of Equity Method Investments [Line Items]
Investments held | investment	2
Equity method investments in Partnerships
Schedule of Equity Method Investments [Line Items]
Percent interest in partnerships	1.00%
Investment, Held As Collateral
Schedule of Equity Method Investments [Line Items]
Net gain (loss)	$ (723)	$ 814
Investment, Measurement Alternative
Schedule of Equity Method Investments [Line Items]
Net gain (loss)	$ 6,687