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BANK DEPOSITS, Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Bank Deposits [Line Items]    
Bank deposits $ 63,319 $ 58,897
Raymond James & Associates, Inc.    
Bank Deposits [Line Items]    
Related party deposits 26,000 26,560
Private Client Group clients    
Bank Deposits [Line Items]    
Bank deposits $ 14,910 $ 13,470