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Condensed Financial Information of Parent Company Only Disclosure - Condensed Balance Sheets (Share Information) (Details) - $ / shares
Sep. 30, 2022
Sep. 30, 2021
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) 30,000,000 30,000,000
Common stock - issued (in shares) 22,911,227 22,431,233
Common stock - outstanding (in shares) 20,303,904 19,823,910
Treasury stock - shares (in shares) 2,607,323 2,607,323
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) 30,000,000 30,000,000
Common stock - issued (in shares) 22,911,227 22,431,233
Common stock - outstanding (in shares) 20,303,904 19,823,910
Treasury stock - shares (in shares) 2,607,323 2,607,323