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Fair Value Measurements - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		21 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025
Goodwill [Roll Forward]
Beginning balance			$ 9,914
Impairment	$ 0	$ (298)	0	$ (3,692)	$ (2,400,000)
Ending balance	9,914		9,914		9,914
Ben Liquidity
Goodwill [Roll Forward]
Beginning balance			0
Impairment			0
Ending balance	0		0		0
Ben Custody
Goodwill [Roll Forward]
Beginning balance			7,469
Impairment			0
Ending balance	7,469		7,469		7,469
Ben Insurance
Goodwill [Roll Forward]
Beginning balance			0
Impairment			0
Ending balance	0		0		0
Ben Markets
Goodwill [Roll Forward]
Beginning balance			2,445
Impairment			0
Ending balance	$ 2,445		$ 2,445		$ 2,445

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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