Investments - Equity Method Investments (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Mar. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]
Investments in funds		$ 155,857	$ 135,043
Accrued carried interest allocations		1,381,110	1,354,051
Legacy Greenspring investments in funds and accrued carried interest allocations	[1]	623,546	631,197
Total equity method investments		2,160,513	2,120,291
Investment in fund, before eliminations		231,700	204,800
Legacy Greenspring investments in funds		150,900	147,000
Legacy Greenspring accrued carried interest allocations		$ 472,700	$ 484,200

[1] Reflects amounts attributable to consolidated VIEs for which the Company did not acquire any direct economic interests. See note 5 for more information.