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Investments - Equity Method Income (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
	Sep. 30, 2021	Sep. 30, 2021		Sep. 30, 2020		Sep. 30, 2021		Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Total carried interest allocations		$ 196,386		$ 166,065		$ 422,748		$ 37,563
Investment income		7,187		4,325		13,611		1,147
Legacy Greenspring investment income	$ 1,400	0	[1]	0	[1]	0	[1]	0	[1]
Total equity method income		203,573		170,390		436,359		38,710
Legacy Greenspring carried interest allocations
Schedule of Equity Method Investments [Line Items]
Total carried interest allocations	$ 3,000	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]
[1] Reflects the net effect of gross realized gains and the reversal of such amounts in unrealized gains. See notes 3, 5 and 14 for more information.

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