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Fair Value Measurements - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) security | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) | Mar. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |
Alternative assets | $ 302,810,000 |  |  |  | $ 302,810,000 |  | $ 385,851,000 |
Gain (loss) on investments | 7,448,000 |  |  | $ 11,478,000 | 7,935,000 | $ (30,738,000) |  |
Equity securities without readily determinable fair value | $ 64,500,000 |  |  |  | $ 64,500,000 |  | 21,600,000 |
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 | 3,300,000 |  |
Loss on impairment of goodwill | 883,223,000 | $ 306,700,000 | $ 1,100,000,000 | $ 0 | 2,286,212,000 | $ 0 |  |
Cumulative impairment loss | $ 2,300,000,000 |  |  |  | $ 2,300,000,000 |  |  |
Long-term growth rate | 3.00% | 3.00% | 3.00% |  | 3.00% |  |  |
Goodwill | $ 81,714,000 |  |  |  | $ 81,714,000 |  | 2,367,926,000 | [1]
Ben Markets |  |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |
Loss on impairment of goodwill |  |  |  |  | 0 |  |  |
Goodwill | $ 9,885,000 | $ 9,900,000 | $ 9,900,000 |  | $ 9,885,000 |  | $ 9,885,000 |
Minimum |  |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |
Discount rates | 26.30% | 25.30% | 24.80% |  | 26.30% |  |  |
Maximum |  |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |
Discount rates | 27.20% | 26.20% | 25.60% |  | 27.20% |  |  |
[1] | Retroactively adjusted March 31, 2023 for the de-SPAC merger transaction as described in Note 4. Such adjustments are unaudited.

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