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Investments - Narrative (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Mar. 31, 2021
Product Information [Line Items]
Accrued carried interest-related compensation		$ 638,754	$ 465,610
Legacy Greenspring investments in funds and accrued carried interest allocations	[1]	1,208,693	0
Legacy Entities
Product Information [Line Items]
Non-controlling interests	[1]	219,086	0
Non-controlling interest holders
Product Information [Line Items]
Accrued carried interest-related compensation		638,800	$ 465,600
Legacy Greenspring investments in funds and accrued carried interest allocations		$ 989,600
Revenue Benchmark | Separately Managed Account Concentration Risk | Three Investments
Product Information [Line Items]
Equity method investment, total accrued carried interest allocation percentage		34.00%
Revenue Benchmark | Separately Managed Account Concentration Risk | Two Investments
Product Information [Line Items]
Equity method investment, total accrued carried interest allocation percentage			26.00%
Revenue Benchmark | Comingled Funds Concentration Risk | Two Investments
Product Information [Line Items]
Equity method investment, total accrued carried interest allocation percentage		40.00%
[1] Reflects amounts attributable to consolidated VIEs for which the Company did not acquire any direct economic interests. See notes 5 and 14 for more information.

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