Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Mar. 31, 2024
Variable Interest Entity [Line Items]
Investments in funds	$ 155,857	$ 135,043
Legacy Greenspring investments in funds	150,900	147,000
Due from affiliates	80,280	67,531
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in funds	150,735	135,043
Legacy Greenspring investments in funds	150,852	147,042
Due from affiliates	42,558	34,744
Maximum exposure to loss	170,496	144,425
Variable Interest Entity, Not Primary Beneficiary, Subsidiaries
Variable Interest Entity [Line Items]
Less: Amounts attributable to non-controlling interests	22,797	25,362
Variable Interest Entity, Not Primary Beneficiary, Legacy Entities
Variable Interest Entity [Line Items]
Less: Amounts attributable to non-controlling interests	$ 150,852	$ 147,042