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Investments, at Fair Value - Narrative (Details)	3 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($) underlyingInvestment investmentFund	Jun. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Return of investments in alternative assets held by Customer ExAlt Trusts	$ 3,711,000	$ 7,248,000	$ 27,600,000
Income (loss) from equity method investments	$ 11,800,000
Alternative investment funds | investmentFund	204
Underlying investments | underlyingInvestment	592
Percent of underlying investments in private companies	91.00%
Credit-related loss on investment in debt securities available-for-sale	$ 0	(500,000)
Equity securities without readily determinable fair value	26,500,000		26,500,000
Equity impairment loss	0	$ 0
Other Public Companies | Class A common stock, par value $0.001 per share
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of common stock	$ 4,000,000.0		$ 4,100,000

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