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Cover - shares
 6 Months Ended
Jun. 30, 2023
Aug. 02, 2023
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   30,571,779
Entity Central Index Key 0001464790  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q2  
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  
Depositary Shares, each representing a 1/1000th fractional interest in a 6.875% share of Series A Cumulative Perpetual 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  
Depositary Shares, each representing a 1/1000th fractional interest in a 7.375% share of Series B Cumulative Perpetual 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