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Condensed Financial Information of Parent Company Only Disclosure - Condensed Balance Sheets (Share Information) (Details) - $ / shares | Sep. 30, 2023 | Sep. 30, 2022
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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) | 23,403,960 | 22,911,227
Common stock, outstanding (in shares) | 20,796,637 | 20,303,904
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) | 200,000,000 | 200,000,000
Common stock, issued (in shares) | 23,403,960 | 22,911,227
Common stock, outstanding (in shares) | 20,796,637 | 20,303,904
Treasury stock, shares (in shares) | 2,607,323 | 2,607,323

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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