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Business Combinations - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	6 Months Ended
	Sep. 20, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 18, 2020
Business Acquisition [Line Items]
Goodwill		$ 582,973	$ 582,973	$ 582,973	$ 6,792
Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Unvested awards (in shares)		1,905,961	1,905,961	1,905,961	2,549,861	2,500,000
Greenspring
Business Acquisition [Line Items]
Ownership percentage acquired	100.00%
Cash consideration, net of working capital adjustment	$ 185,000
Earn-out (up to)	75,000
Acquisition-related costs			$ 10,300	$ 13,800
Goodwill	576,181
Revenue since acquisition date				2,300
Earnings since acquisition date				$ 1,000
Greenspring | Contractual rights
Business Acquisition [Line Items]
Finite-lived intangible assets	320,500
Weighted-average amortization period				10 years
Greenspring | Client relationships
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 96,650
Greenspring | Class A Common Stock
Business Acquisition [Line Items]
Stock issued for acquisition (in shares)		12,686,756
Greenspring | Class C units
Business Acquisition [Line Items]
Stock issued for acquisition (in shares)		3,071,519

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Payments To Acquire Businesses, Net Of Working Capital Adjustment

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