Basis of Presentation and Consolidation and Accounting Standards Adopted (Policies) |
9 Months Ended |
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Jun. 30, 2026 | |
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Basis of Presentation | The accompanying unaudited Condensed Consolidated Balance Sheet as of September 30, 2025, which has been derived from the audited consolidated balance sheet as of September 30, 2025, and the unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and disclosures normally included in annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted pursuant to those rules and regulations. The Company believes that the included disclosures clearly and fairly present the information within. In management’s opinion, all adjustments, generally consisting of normal accruals, considered necessary to fairly present the condensed consolidated financial statements for the interim periods presented have been reflected as required by Rule 10-01 of Regulation S-X. Operating results for interim periods are not necessarily indicative of the results that may be expected for the full year. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2025, as filed with the SEC.
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| Consolidation | These condensed consolidated financial statements include the accounts of StoneX Group Inc. and all entities in which the Company has a controlling financial interest. All material intercompany transactions and balances have been eliminated in consolidation.
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| Use of Estimates | Preparing condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities as of the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The most significant of these estimates and assumptions in the current year relate to fair value measurements for financial instruments, revenue recognition, valuation of inventories, and income taxes. The Company reviews all significant estimates affecting the financial statements on a recurring basis and makes necessary adjustments to the financial statements presented within this Form 10-Q. Although these and other estimates and assumptions are based on the best available information, actual results could be materially different from estimates. Estimates and assumptions are based on management’s best knowledge of current events and actions the Company may undertake in the future, using information reasonably available to the Company as of June 30, 2026 and through the date of this Form 10-Q.
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| Accounting Standards Adopted | In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2023-07, Improvements to Reportable Segment Disclosures, which requires entities to enhance disclosures regarding segments, including significant segment expenses. The Company adopted ASU No. 2023-07 related to annual disclosure requirements effective with the fiscal 2025 Form 10-K, with newly required annual disclosures being included in Note 22 of the fiscal 2025 Form 10-K. The Company adopted ASU 2023-07 related to interim disclosure requirements effective with the first quarter fiscal 2026 10-Q filing and applied the updated disclosure requirements retrospectively to all periods presented. See Note 18 for more information.
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| Earnings per Share | The Company presents basic and diluted earnings per share (“EPS”) using the two-class method, which requires all outstanding unvested share-based payment awards that contain rights to non-forfeitable dividends and therefore participate in undistributed earnings with common stockholders be included in computing earnings per share. Under the two-class method, net income is reduced by the amount of dividends declared in the period for each class of common stock and participating security. The remaining undistributed earnings are then allocated to common stock and participating securities, based on their respective rights to receive dividends. Restricted stock awards granted to certain employees and directors contain non-forfeitable rights to dividends at the same rate as common stock and are considered participating securities. Basic EPS has been computed by dividing net income by the weighted-average number of common shares outstanding. |
| Income Taxes | The income tax provision for interim periods comprises income tax on ordinary income/(loss) at the most recent estimated annual effective income tax rate, adjusted for the income tax effect of discrete items. Management uses an estimated annual effective income tax rate based on the forecasted pretax income/(loss) and statutory tax rates in the various jurisdictions in which the Company operates. |