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Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Variable Interest Entity [Line Items]
Investments in funds	$ 90,325	$ 74,379
Legacy Greenspring investments in funds	219,100
Due from affiliates	10,236	7,474
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in funds	90,325	74,379
Legacy Greenspring investments in funds	219,086	0
Due from affiliates	7,768	4,218
Maximum exposure to loss	89,143	71,109
Variable Interest Entity, Not Primary Beneficiary, Subsidiaries
Variable Interest Entity [Line Items]
Less: Amounts attributable to non-controlling interests	8,950	7,488
Variable Interest Entity, Not Primary Beneficiary, Legacy Entities
Variable Interest Entity [Line Items]
Less: Amounts attributable to non-controlling interests	$ 219,086	$ 0

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