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Condensed Financial Information of Parent Company Only Disclosure - Condensed Balance Sheets (Share Information) (Details) - $ / shares
Sep. 30, 2025
Sep. 30, 2024
Condensed Balance Sheet Statements, Captions [Line Items]    
Preferred stock, par value (in dollar per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 1,000,000 1,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollar per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 200,000,000 200,000,000
Common stock, issued (in shares) 54,967,558 53,678,016
Common stock, outstanding (in shares) 52,186,635 47,811,539
Treasury stock, shares (in shares) 2,780,923 5,866,477
StoneX Group    
Condensed Balance Sheet Statements, Captions [Line Items]    
Preferred stock, par value (in dollar per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 1,000,000 1,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollar per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 200,000,000 200,000,000
Common stock, issued (in shares) 54,967,558 53,678,016
Common stock, outstanding (in shares) 52,186,635 47,811,539