Fair Value Measurements - Schedule of Reconciliation of Other Investments (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reconciliation of Other Investments (Level 3) [Roll Forward]
Other investments, beginning balance	$ 14,149	$ 12,931	$ 14,228	$ 13,818
Contributions	0	22	0	22
Distributions	(936)	(690)	(986)	(854)
Net gain (loss)	(840)	817	(869)	94
Other investments, ending balance	12,373	13,080	12,373	13,080
Private equity funds
Reconciliation of Other Investments (Level 3) [Roll Forward]
Other investments, beginning balance	6,430	6,404	6,664	7,024
Contributions	0	22	0	22
Distributions	(138)	(690)	(188)	(854)
Net gain (loss)	(553)	516	(737)	60
Other investments, ending balance	5,739	6,252	5,739	6,252
Direct credit investments
Reconciliation of Other Investments (Level 3) [Roll Forward]
Other investments, beginning balance	785	773	790	774
Contributions	0	0	0	0
Distributions	(798)	0	(798)	0
Net gain (loss)	13	(5)	8	(6)
Other investments, ending balance	0	768	0	768
Direct credit investments | Consolidated Funds
Reconciliation of Other Investments (Level 3) [Roll Forward]
Other investments, beginning balance	54,625		21,163
Contributions	10,731		24,787
Distributions	(140)		(180)
Net gain (loss)	412		494
Transfer in	3,753		23,117
Other investments, ending balance	69,381		69,381
Direct equity investments
Reconciliation of Other Investments (Level 3) [Roll Forward]
Other investments, beginning balance	6,934	5,754	6,774	6,020
Contributions	0	0	0	0
Distributions	0	0	0	0
Net gain (loss)	(300)	306	(140)	40
Other investments, ending balance	$ 6,634	$ 6,060	$ 6,634	$ 6,060