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ORGANIZATION AND NATURE OF BUSINESS OPERATIONS (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 13, 2024
USD ($)
Sep. 17, 2024
USD ($)
Oct. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
segment
Jun. 30, 2023
USD ($)
Nov. 30, 2024
USD ($)
Sep. 16, 2024
USD ($)
Aug. 21, 2023
USD ($)
Segment Reporting Information [Line Items]                      
Number of operating segments | segment             6        
Net (loss) income attributable to B. Riley Financial, Inc.         $ (433,604) $ 46,381 $ (482,769) $ 63,536      
Subsequent Event                      
Segment Reporting Information [Line Items]                      
Proceeds from sale of interest     $ 189,331                
Subsequent Event | Common Units                      
Segment Reporting Information [Line Items]                      
Preferred units, issued and outstanding, purchase price $ 203,000                    
Nomura Credit Agreement | Line of Credit                      
Segment Reporting Information [Line Items]                      
Line of credit facility, remaining borrowing capacity                     $ 347,877
Nomura Credit Agreement | Line of Credit | Subsequent Event                      
Segment Reporting Information [Line Items]                      
Line of credit, outstanding   $ 100,000                  
Outstanding notes payable   85,146                  
Line of credit facility, remaining borrowing capacity   $ 388,127 216,647           $ 125,000 $ 469,750  
Repayment of loan with equity securities     $ 171,480                
FRG                      
Segment Reporting Information [Line Items]                      
Equity method investment, fair value adjustment             $ 391,754        
FRG | Subsequent Event                      
Segment Reporting Information [Line Items]                      
Equity method investment, fair value adjustment       $ (63,674)