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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Apr. 12, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-37503    
Entity Registrant Name B. RILEY FINANCIAL, INC.    
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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Interactive Data Current No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 831.2
Entity Common Stock, Shares Outstanding   30,295,303  
Documents Incorporated by Reference
Information required in Part III of this Annual Report on Form 10-K is incorporated by reference to an amendment to this Form 10-K to be filed with the the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2023.
    
Entity Central Index Key 0001464790    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock, par value $0.0001 per share      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol RILY    
Security Exchange Name NASDAQ    
Series A Preferred Stock      
Document Information [Line Items]      
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    
Trading Symbol RILYP    
Security Exchange Name NASDAQ    
Series B Preferred Stock      
Document Information [Line Items]      
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    
Trading Symbol RILYL    
Security Exchange Name NASDAQ    
6.50% Senior Notes due 2026      
Document Information [Line Items]      
Title of 12(b) Security 6.50% Senior Notes due 2026    
Trading Symbol RILYN    
Security Exchange Name NASDAQ    
6.375% Senior Notes due 2025      
Document Information [Line Items]      
Title of 12(b) Security 6.375% Senior Notes due 2025    
Trading Symbol RILYM    
Security Exchange Name NASDAQ    
6.75% Senior Notes due 2024      
Document Information [Line Items]      
Title of 12(b) Security 6.75% Senior Notes due 2024    
Trading Symbol RILYO    
Security Exchange Name NASDAQ    
6.00% Senior Notes due 2028      
Document Information [Line Items]      
Title of 12(b) Security 6.00% Senior Notes due 2028    
Trading Symbol RILYT    
Security Exchange Name NASDAQ    
5.50% Senior Notes due 2026      
Document Information [Line Items]      
Title of 12(b) Security 5.50% Senior Notes due 2026    
Trading Symbol RILYK    
Security Exchange Name NASDAQ    
5.25% Senior Notes due 2028      
Document Information [Line Items]      
Title of 12(b) Security 5.25% Senior Notes due 2028    
Trading Symbol RILYZ    
Security Exchange Name NASDAQ    
5.00% Senior Notes due 2026      
Document Information [Line Items]      
Title of 12(b) Security 5.00% Senior Notes due 2026    
Trading Symbol RILYG    
Security Exchange Name NASDAQ