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SECURITIES AND OTHER INVESTMENTS OWNED AND SECURITIES SOLD NOT YET PURCHASED - Schedule of equity method investments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2025
Schedule of Equity Method Investments [Line Items]          
Deficit/Equity attributable to investee $ 77,321 $ (171,533)      
Revenues 352,060   $ 186,063    
Loss from continuing operations 222,159   (19,962)    
Net income (loss) attributable to investees $ 213,273   $ (9,975)    
B&W          
Schedule of Equity Method Investments [Line Items]          
Current assets   470,676     $ 479,733
Noncurrent assets   192,262     178,151
Current liabilities   386,694     400,985
Noncurrent liabilities   407,785     489,106
Revenues   113,417   $ 66,276  
Cost of revenues   90,011   42,043  
Loss from continuing operations   (16,691)   (71,318)  
Net income (loss) attributable to investees   9,230   (63,021)  
B&W | Investee          
Schedule of Equity Method Investments [Line Items]          
Deficit/Equity attributable to investee   (131,541)     (232,207)
Net income (loss) attributable to investees   9,230   (63,065)  
Other Equity Investments          
Schedule of Equity Method Investments [Line Items]          
Current assets   26,075     23,491
Noncurrent assets   145,015     140,981
Current liabilities   14,908     22,988
Noncurrent liabilities   78,877     66,509
Revenues   15,537   11,723  
Cost of revenues   3,156   2,794  
Other Equity Investments | Investee          
Schedule of Equity Method Investments [Line Items]          
Deficit/Equity attributable to investee   77,305     $ 74,975
Net income (loss) attributable to investees   $ 2,307   $ (2,314)