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Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Apr. 01, 2021 USD ($)	Mar. 31, 2021 USD ($)
Accounting Policies [Abstract]
Lease right-of-use assets, net	$ 65,476,000		$ 65,476,000		$ 66,700,000	$ 0
Lease liabilities	75,806,000		$ 75,806,000		$ 76,900,000	$ 0
Incentive fees as percentage of profits			10.00%
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impairment of finite-lived intangible assets	$ 0	$ 0	$ 0	$ 0
Number of operating segments | segment			1
Number of reportable segments | segment			1
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finite-lived intangible assets, estimated useful lives			8 years
Carried interest allocation as percentage of cumulative fund or account performance			5.00%
Revenue, carried interest allocation, minimum return levels required			5.00%
Legacy carried interest allocation as percentage of cumulative fund or account performance			5.00%
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finite-lived intangible assets, estimated useful lives			10 years
Carried interest allocation as percentage of cumulative fund or account performance			15.00%
Revenue, carried interest allocation, minimum return levels required			10.00%
Legacy carried interest allocation as percentage of cumulative fund or account performance			20.00%

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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