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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of equity method investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Schedule of Equity Method Investments [Line Items]            
Equity attributable to investee $ 291,117   $ 446,514      
Total revenues 1,643,600   1,080,670   $ 1,554,698  
Cost of revenue and expenses 1,498,947   1,011,222   1,040,170  
Net (loss) income attributable to B. Riley Financial, Inc. $ (99,910)   $ (159,829)   $ 445,054  
Five Investments            
Schedule of Equity Method Investments [Line Items]            
Current assets   $ 51,588   $ 58,552    
Noncurrent assets   269,809   143,969    
Current liabilities   8,594   4,855    
Noncurrent liabilities   760   883    
Noncontrolling interest   2,876   0    
Total revenues   147,938   127,240   $ 99,386
Cost of revenue and expenses   75,160   62,440   51,430
Five Investments | Investee            
Schedule of Equity Method Investments [Line Items]            
Equity attributable to investee   309,167   196,783    
Net (loss) income attributable to B. Riley Financial, Inc.   75,338   67,354   62,925
FRG            
Schedule of Equity Method Investments [Line Items]            
Current assets   1,219,682        
Noncurrent assets   3,142,660        
Current liabilities   749,894        
Noncurrent liabilities   2,695,445        
Total revenues   4,276,097        
Cost of revenues   2,608,203        
FRG | Investee            
Schedule of Equity Method Investments [Line Items]            
Equity attributable to investee   917,003        
Net (loss) income attributable to B. Riley Financial, Inc.   (276,813)        
B&W            
Schedule of Equity Method Investments [Line Items]            
Current assets   542,300   498,593    
Noncurrent assets   294,979   382,974    
Current liabilities   393,539   319,533    
Noncurrent liabilities   585,430   579,162    
Noncontrolling interest   626   891    
Total revenues   1,022,064   832,233   680,921
Cost of revenues   795,422   651,493   512,601
Loss (income) from continuing operations   (23,484)   (3,958)   13,045
Net (loss) income attributable to B. Riley Financial, Inc.   (128,587)   (2,052)   6,362
B&W | Investee            
Schedule of Equity Method Investments [Line Items]            
Equity attributable to investee   (142,316)   (18,019)    
Net (loss) income attributable to B. Riley Financial, Inc.   (143,591)   (13,868)   481
Synchronoss Technologies, Inc.            
Schedule of Equity Method Investments [Line Items]            
Current assets   85,903   112,377    
Noncurrent assets   275,304   286,512    
Current liabilities   74,528   81,667    
Noncurrent liabilities   166,673   170,809    
Total revenues   234,699   264,829   276,161
Cost of revenues   82,167   95,621   111,438
Synchronoss Technologies, Inc. | Investee            
Schedule of Equity Method Investments [Line Items]            
Equity attributable to investee   120,006   146,413    
Net (loss) income attributable to B. Riley Financial, Inc.   (45,468)   (3,655)   (142,810)
Alta Equipment Group, Inc.            
Schedule of Equity Method Investments [Line Items]            
Current assets   784,300   581,900    
Noncurrent assets   696,100   560,700    
Current liabilities   569,800   415,200    
Noncurrent liabilities   763,100   586,700    
Total revenues   1,783,900   1,499,500   1,136,900
Cost of revenues   1,298,900   1,101,600   847,200
Alta Equipment Group, Inc. | Investee            
Schedule of Equity Method Investments [Line Items]            
Equity attributable to investee   147,500   140,700    
Net (loss) income attributable to B. Riley Financial, Inc.   7,100   6,500   (25,300)
Other Equity Investments            
Schedule of Equity Method Investments [Line Items]            
Current assets   281,610   69,706    
Noncurrent assets   627,858   168,721    
Current liabilities   150,114   40,985    
Noncurrent liabilities   277,638   104,758    
Preferred stock   4,500   4,500    
Total revenues   551,374   114,941   17,352
Cost of revenue and expenses   383,461   55,780   7,432
Other Equity Investments | Investee            
Schedule of Equity Method Investments [Line Items]            
Equity attributable to investee   477,216   88,184    
Net (loss) income attributable to B. Riley Financial, Inc.   $ 35,898   $ 6,146   $ (3,402)