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ACQUISITIONS - Pro forma (Details) - Targus - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Revenues	$ 419,715	$ 994,836
Net income (loss)	60,188	(82,519)
Net income (loss) attributable to B. Riley Financial, Inc.	55,380	(91,764)
Net income (loss) attributable to common shareholders	$ 53,378	$ (97,770)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
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-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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