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ACQUISITIONS - Pro forma (Details) - FRG Investment - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Business Acquisition [Line Items]
Revenues	$ 462,312,000	$ 1,300,680,000
Net loss attributable to B. Riley Financial, Inc.	(75,093,000)	(16,127,000)
Net loss attributable to common shareholders	$ (77,108,000)	$ (22,169,000)
Basic income per share (in dollars per share)	$ (2.54)	$ (0.73)
Diluted income per share (in dollars per share)	$ (2.51)	$ (0.71)
Weighted average basic shares outstanding (in shares)	30,330,025	30,502,179
Weighted average diluted shares outstanding (in shares)	30,745,155	31,173,794

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