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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