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Fair Value Measurements - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Beginning balance | [1] |  |  | $ 2,367,926 |  | $ 2,367,926 |
Impairment |  | $ (883,223) | $ (306,700) | (1,100,000) | $ 0 | (2,286,212) | $ 0
Ending balance |  | 81,714 |  |  |  | 81,714 |
Ben Liquidity |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,725,880 |  | 1,725,880 |
Impairment |  |  |  |  |  | (1,725,880) |
Ending balance |  | 0 |  |  |  | 0 |
Ben Custody |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  | 594,219 |  | 594,219 |
Impairment |  |  |  |  |  | (554,607) |
Ending balance |  | 39,612 |  |  |  | 39,612 |
Ben Insurance |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  | 37,942 |  | 37,942 |
Impairment |  |  |  |  |  | (5,725) |
Ending balance |  | 32,217 |  |  |  | 32,217 |
Ben Markets |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 9,900 | 9,900 | 9,885 |  | 9,885 |
Impairment |  |  |  |  |  | 0 |
Ending balance |  | $ 9,885 | $ 9,900 | $ 9,900 |  | $ 9,885 |
[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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