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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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