| Document And Entity Information - USD ($) $ in Millions | 12 Months Ended | ||
| Dec. 31, 2023 | Apr. 16, 2024 | Jun. 30, 2023 | |
| Document Information Line Items | |||
| Entity Registrant Name | B. RILEY FINANCIAL, INC. | ||
| Document Type | 10-K/A | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Common Stock, Shares Outstanding | 30,142,863 | ||
| Entity Public Float | $ 831.2 | ||
| Amendment Flag | true | ||
| Amendment Description | This Amendment No. 1 on Form 10-K/A (this “Amendment No. 1”) amends the Annual Report on Form 10-K (the “Original Form 10-K”) for the fiscal year ended December 31, 2023 of B. Riley Financial, Inc. (the “Company”), as originally filed with the Securities and Exchange Commission (“SEC”) on April 24, 2024 (the “Original Filing Date”). We are filing this Amendment No. 1 to (i) include the information required by Part III of Form 10-K that was previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K and (ii) amend Item 15 of Part IV of the Original Form 10-K to update the exhibit list.This Amendment No. 1 does not amend, modify, or otherwise update any other information in the Original Form 10-K. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Form 10-K and with our filings with the SEC subsequent to the filing of the Original Form 10-K. In addition, this Amendment No. 1 does not reflect events that may have occurred subsequent to the Original Filing Date and no attempt has been made in this Amendment to modify or update other disclosures as presented in the Original Form 10-K.In accordance with Rules 12b-15 and 13a-14 under the Exchange Act, we have amended Part IV, Item 15 to include currently dated certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Because no financial statements are included in this Amendment No. 1 and this Amendment No. 1 does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. We are not including the certifications under Section 906 of the Sarbanes-Oxley Act of 2002 as no financial statements are being filed with this Amendment No. 1.Except as otherwise required by the context, references in this Amendment No. 1 to “the Company,” “B. Riley,” “B. Riley Financial,” “we,” “us” or “our” refer to the combined business of B. Riley Financial, Inc. and all of its subsidiaries. | ||
| Entity Central Index Key | 0001464790 | ||
| Entity Current Reporting Status | No | ||
| Entity Voluntary Filers | No | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Well-known Seasoned Issuer | No | ||
| Document Period End Date | Dec. 31, 2023 | ||
| Document Fiscal Year Focus | 2023 | ||
| Document Fiscal Period Focus | FY | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| Entity Shell Company | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Entity File Number | 001-37503 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 27-0223495 | ||
| Entity Address, Address Line One | 11100 Santa Monica Blvd. | ||
| Entity Address, Address Line Two | Suite 800 | ||
| Entity Address, City or Town | Los Angeles | ||
| Entity Address, State or Province | CA | ||
| Entity Address, Postal Zip Code | 90025 | ||
| City Area Code | (310) | ||
| Local Phone Number | 966-1444 | ||
| Entity Interactive Data Current | No | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Auditor Name | Marcum LLP | ||
| Auditor Location | Melville, NY | ||
| Auditor Firm ID | 688 | ||
| Common Stock, par value $0.0001 per share | |||
| Document Information Line Items | |||
| Trading Symbol | RILY | ||
| Title of 12(b) Security | Common Stock, par value $0.0001 per share | ||
| Security Exchange Name | NASDAQ | ||
| Series A Preferred Stock | |||
| Document Information Line Items | |||
| Trading Symbol | RILYP | ||
| Title of 12(b) Security | Depositary Shares, each representing a 1/1000th fractional interest in a 6.875% share of Series A Cumulative Perpetual Preferred Stock | ||
| Security Exchange Name | NASDAQ | ||
| Series B Preferred Stock | |||
| Document Information Line Items | |||
| Trading Symbol | RILYL | ||
| Title of 12(b) Security | Depositary Shares, each representing a 1/1000th fractional interest in a 7.375% share of Series B Cumulative Perpetual Preferred Stock | ||
| Security Exchange Name | NASDAQ | ||
| 6.75% Senior Notes due 2024 | |||
| Document Information Line Items | |||
| Trading Symbol | RILYO | ||
| Title of 12(b) Security | 6.75% Senior Notes due 2024 | ||
| Security Exchange Name | NASDAQ | ||
| 6.375% Senior Notes due 2025 | |||
| Document Information Line Items | |||
| Trading Symbol | RILYM | ||
| Title of 12(b) Security | 6.375% Senior Notes due 2025 | ||
| Security Exchange Name | NASDAQ | ||
| 5.00% Senior Notes due 2026 | |||
| Document Information Line Items | |||
| Trading Symbol | RILYG | ||
| Title of 12(b) Security | 5.00% Senior Notes due 2026 | ||
| Security Exchange Name | NASDAQ | ||
| 5.50% Senior Notes due 2026 | |||
| Document Information Line Items | |||
| Trading Symbol | RILYK | ||
| Title of 12(b) Security | 5.50% Senior Notes due 2026 | ||
| Security Exchange Name | NASDAQ | ||
| 6.50% Senior Notes due 2026 | |||
| Document Information Line Items | |||
| Trading Symbol | RILYN | ||
| Title of 12(b) Security | 6.50% Senior Notes due 2026 | ||
| Security Exchange Name | NASDAQ | ||
| 5.25% Senior Notes due 2028 | |||
| Document Information Line Items | |||
| Trading Symbol | RILYZ | ||
| Title of 12(b) Security | 5.25% Senior Notes due 2028 | ||
| Security Exchange Name | NASDAQ | ||
| 6.00% Senior Notes due 2028 | |||
| Document Information Line Items | |||
| Trading Symbol | RILYT | ||
| Title of 12(b) Security | 6.00% Senior Notes due 2028 | ||
| Security Exchange Name | NASDAQ |
