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ACQUISITIONS - Pro forma (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
FRG Investment    
Business Acquisition [Line Items]    
Revenues $ 1,643,600 $ 1,080,670
Net (loss) income attributable to B. Riley Financial, Inc. (105,750) (168,970)
Net (loss) income attributable to common shareholders $ (113,807) $ (176,978)
Basic loss per share (in dollars per share) $ (3.74) $ (5.84)
Diluted loss per share (in dollars per share) $ (3.74) $ (5.84)
Weighted average basic shares outstanding (in shares) 30,456,631 30,279,439
Weighted average diluted shares outstanding (in shares) 30,456,631 30,279,439
Targus    
Business Acquisition [Line Items]    
Revenues   $ 1,418,291,000
Net (loss) income   (138,448,000)
Net (loss) income attributable to B. Riley Financial, Inc.   (141,683,000)
Net (loss) income attributable to common shareholders   $ (149,691,000)