Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total revenues	$ 758,993	$ 712,963	$ 553,842
Management and advisory fees
Disaggregation of Revenue [Line Items]
Total revenues	584,216	513,864	451,936
Specialized funds
Disaggregation of Revenue [Line Items]
Total revenues	374,405	315,214	261,012
Customized separate accounts
Disaggregation of Revenue [Line Items]
Total revenues	141,535	134,400	128,826
Advisory
Disaggregation of Revenue [Line Items]
Total revenues	20,473	22,806	24,229
Reporting, monitoring, data and analytics
Disaggregation of Revenue [Line Items]
Total revenues	35,766	29,244	24,711
Distribution management
Disaggregation of Revenue [Line Items]
Total revenues	2,170	2,619	5,054
Fund reimbursement revenue
Disaggregation of Revenue [Line Items]
Total revenues	9,867	9,581	8,104
Total incentive fees
Disaggregation of Revenue [Line Items]
Total revenues	174,777	199,099	101,906
Specialized funds
Disaggregation of Revenue [Line Items]
Total revenues	146,293	182,092	89,988
Specialized funds \| Consolidated Funds
Disaggregation of Revenue [Line Items]
Total revenues	4,202	803	0
Customized separate accounts
Disaggregation of Revenue [Line Items]
Total revenues	$ 24,282	$ 16,204	$ 11,918