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Regulatory Capital Requirements (Tables) | 6 Months Ended
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Mar. 31, 2025
Capital and Other Regulatory Requirements [Abstract] |
Schedule of Subsidiaries with Minimum Regulatory Requirements | The following table details those subsidiaries with minimum regulatory requirements in excess of $10.0 million along with the actual balance maintained as of that date.
(in millions) |  |  | As of March 31, 2025
Subsidiary | Regulatory Authority |  | Actual |  | Minimum Requirement
StoneX Financial Inc. | SEC and CFTC |  | $ | 426.5 |  |  | $ | 252.2 |
StoneX Financial Ltd. | FCA |  | $ | 563.0 |  |  | $ | 437.2 |
Gain Capital Group, LLC | CFTC and NFA |  | $ | 56.2 |  |  | $ | 30.8 |
StoneX Financial Pte. Ltd. | MAS |  | $ | 112.0 |  |  | $ | 24.3 |
StoneX Markets LLC | CFTC and NFA |  | $ | 245.4 |  |  | $ | 134.2 |

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- Definition Capital and Other Regulatory Requirements [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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