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ORGANIZATION AND NATURE OF BUSINESS OPERATIONS (Details)			3 Months Ended
	Apr. 04, 2025 USD ($) financial_advisor	Mar. 03, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($) segment	Mar. 31, 2024 USD ($)	Jul. 11, 2025 USD ($) transaction	Jun. 27, 2025 USD ($)	Mar. 26, 2025 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment				5
Net loss attributable to B. Riley Financial, Inc.				$ (9,975,000)	$ (49,165,000)
5.50% Senior Notes due March 2026 | Senior Notes
Segment Reporting Information [Line Items]
Interest rate				5.50%
5.50% Senior Notes due March 2026 | Senior Secured Notes
Segment Reporting Information [Line Items]
Principal amount								$ 86,309,000
6.50% Senior Notes due 2026 | Senior Notes
Segment Reporting Information [Line Items]
Interest rate				6.50%
5.00% Senior Notes due December 2026 | Senior Notes
Segment Reporting Information [Line Items]
Interest rate				5.00%
5.00% Senior Notes due December 2026 | Senior Secured Notes
Segment Reporting Information [Line Items]
Principal amount								$ 36,745,000
8.00% Senior Secured Second Lien Notes due 2028 | Senior Secured Notes
Segment Reporting Information [Line Items]
Interest rate								8.00%
Principal amount								$ 87,753,000
Subsequent Event
Segment Reporting Information [Line Items]
Debt instrument, number of private exchange transactions | transaction						4
Subsequent Event | 5.50% Senior Notes due March 2026 | Senior Notes
Segment Reporting Information [Line Items]
Debt instrument, face amount, total						$ 29,535,000
Interest rate						5.50%
Subsequent Event | 5.50% Senior Notes due March 2026 | Senior Secured Notes
Segment Reporting Information [Line Items]
Interest rate						5.50%
Principal amount						$ 101,596,000
Subsequent Event | 6.50% Senior Notes due 2026 | Senior Notes
Segment Reporting Information [Line Items]
Debt instrument, face amount, total						$ 2,061,000
Interest rate						6.50%
Principal amount						$ 178,471,000
Subsequent Event | 5.00% Senior Notes due December 2026 | Senior Notes
Segment Reporting Information [Line Items]
Debt instrument, face amount, total						$ 109,703,000
Interest rate						5.00%
Subsequent Event | 5.00% Senior Notes due December 2026 | Senior Secured Notes
Segment Reporting Information [Line Items]
Interest rate						5.00%
Subsequent Event | 6.00% Senior Notes due January 2028 | Senior Notes
Segment Reporting Information [Line Items]
Debt instrument, face amount, total						$ 51,135,000
Interest rate						6.00%
Subsequent Event | 5.25% Senior Notes due August 2028 | Senior Notes
Segment Reporting Information [Line Items]
Debt instrument, face amount, total						$ 39,485,000
Interest rate						5.25%
Subsequent Event | 8.00% Senior Secured Second Lien Notes due 2028 | Senior Notes
Segment Reporting Information [Line Items]
Debt instrument, face amount, total						$ 140,670,000
Interest rate						8.00%
Subsequent Event | GlassRatner & Farber
Segment Reporting Information [Line Items]
Equity method investment, realized gain on disposal			$ 66,795,000
Disposal Group, Held-for-Sale, Not Discontinued Operations | Subsequent Event
Segment Reporting Information [Line Items]
Disposal group, working capital adjustment, duration							180 days
Disposal Group, Held-for-Sale, Not Discontinued Operations | W-2 Wealth Management Business | Subsequent Event
Segment Reporting Information [Line Items]
Number of financial advisors | financial_advisor	36
Disposal group, including discontinued operation, consideration	$ 26,037,000
Disposal Group, Held-for-Sale, Not Discontinued Operations | Atlantic Coast Recycling
Segment Reporting Information [Line Items]
Gain on sale and deconsolidation of businesses				$ 52,430,000
Disposal group, including discontinued operation, consideration		$ 102,478,000
Proceeds from divestiture of businesses		$ 68,638,000
Discontinued Operations, Disposed of by Sale | Subsequent Event
Segment Reporting Information [Line Items]
Disposal group, including discontinued operation, consideration							$ 117,800,000
Disposal group, working capital adjustment, duration							180 days

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