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Condensed Financial Information of Parent Company Only Disclosure - Balance Sheet (Parentheticals) (Details) - $ / shares
Sep. 30, 2020
Sep. 30, 2019
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) 21,798,551 21,297,317
Common stock - outstanding (in shares) 19,376,594 19,075,360
Treasury stock - shares (in shares) 2,421,957 2,221,957
StoneX Group [Member]    
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) 21,798,551 21,297,317
Common stock - outstanding (in shares) 19,376,594 19,075,360
Treasury stock - shares (in shares) 2,421,957 2,221,957