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Fair Value Measurements - Narrative (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2024 USD ($) $ / shares security	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($) $ / shares security	Dec. 31, 2023 USD ($)	Jun. 30, 2024	Mar. 31, 2024 USD ($)	Sep. 30, 2023	Jun. 30, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative assets	$ 301,058,000		$ 301,058,000			$ 293,916,000
Gain (loss) on investments	4,742,000	$ 7,448,000	24,311,000	$ 7,935,000
Equity securities without readily determinable fair value	$ 26,900,000		$ 26,900,000			$ 26,800,000
Number of securities with an upward adjustment | security	1		1
Equity securities, cumulative upward adjustment	$ 10,800,000		$ 10,800,000
Equity securities, upward adjustment	0	0	0	0
Loss on impairment of goodwill	$ 0	$ 883,223,000	$ 3,692,000	$ 2,286,212,000
Long-term growth rate	3.00%		3.00%		3.00%		3.00%	3.00%
Measurement Input, Expected Term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	1.2		1.2
Measurement Input, Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input | $ / shares	0.195		0.195
Measurement Input, Risk Free Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	4.3		4.3
Yorkville | Measurement Input, Share Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input | $ / shares	0.75		0.75
Yorkville | Measurement Input, Price Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	118.1		118.1
Yorkville | Measurement Input, Expected Dividend Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	0		0
Yorkville | Measurement Input, Risk Free Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	4.07		4.07
Yorkville | Measurement Input, Exercise Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input | $ / shares	2.63		2.63
Ben Markets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loss on impairment of goodwill			$ 265,000
Goodwill impairment test, excess fair value over carrying value	$ 400,000		$ 400,000
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rates					28.00%			24.80%
Minimum | Yorkville | Measurement Input, Expected Term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	2.60		2.60
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rates					29.30%			27.20%
Maximum | Yorkville | Measurement Input, Expected Term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	2.87		2.87

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