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Condensed Financial Information of Parent Company Only Disclosure - Condensed Balance Sheets (Share Information) (Details) - $ / shares
Sep. 30, 2024
Sep. 30, 2023
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) 35,785,432 35,105,852
Common stock, outstanding (in shares) 31,874,447 31,194,867
Treasury stock, shares (in shares) 3,910,985 3,910,985
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) 35,785,432 35,105,852
Common stock, outstanding (in shares) 31,874,447 31,194,867
Treasury stock, shares (in shares) 3,910,985 3,910,985