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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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