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Fair Value Measurements - Goodwill (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance			$ 13,606,000
Impairment	$ 0	$ (883,223,000)	(3,692,000)	$ (2,286,212,000)
Ending balance	9,914,000		9,914,000
Ben Liquidity
Goodwill [Roll Forward]
Beginning balance			0
Impairment			0
Ending balance	0		0
Ben Custody
Goodwill [Roll Forward]
Beginning balance			10,896,000
Impairment			(3,427,000)
Ending balance	7,469,000		7,469,000
Ben Insurance
Goodwill [Roll Forward]
Beginning balance			0
Impairment			0
Ending balance	0		0
Ben Markets
Goodwill [Roll Forward]
Beginning balance			2,710,000
Impairment			(265,000)
Ending balance	$ 2,445,000		$ 2,445,000

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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