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Fair Value Measurements - Narrative (Details)	3 Months Ended		18 Months Ended
	Jun. 30, 2025 USD ($) $ / shares security	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) $ / shares security	Mar. 31, 2025 USD ($)	Dec. 31, 2024	Sep. 30, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative assets	$ 231,586,000		$ 231,586,000	$ 259,113,000
Investment income (loss), net	(12,776,000)	$ 11,028,000
Equity securities without readily determinable fair value	$ 26,500,000		$ 26,500,000	$ 26,500,000
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
Loss on impairment of goodwill	$ 0	$ 3,394,000	$ 2,400,000,000
Long-term growth rate	3.00%		3.00%	3.00%	3.00%	3.00%
Yorkville | Measurement Input, Share Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input | $ / shares	0.30		0.30
Yorkville | Measurement Input, Exercise Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input | $ / shares	2.63		2.63
Yorkville | Measurement Input, Price Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input | $ / shares	84.2		84.2
Yorkville | Measurement Input, Expected Dividend Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	0.000		0.000
Yorkville | Measurement Input, Risk Free Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	3.5		3.5
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rates		28.00%
Minimum | Yorkville | Measurement Input, Expected Term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	2.10		2.10
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rates		29.30%
Maximum | Yorkville | Measurement Input, Expected Term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt instrument, measurement input	2.37		2.37

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