Document and Entity Information - USD ($) |
12 Months Ended | ||
|---|---|---|---|
May 31, 2026 |
Jul. 24, 2026 |
Nov. 28, 2025 |
|
| Cover [Abstract] | |||
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Period End Date | May 31, 2026 | ||
| Document Fiscal Year Focus | 2026 | ||
| Document Fiscal Period Focus | FY | ||
| Trading Symbol | WS | ||
| Entity Registrant Name | WORTHINGTON STEEL, INC. | ||
| Entity Central Index Key | 0001968487 | ||
| Current Fiscal Year End Date | --05-31 | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Current Reporting Status | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Interactive Data Current | Yes | ||
| Entity Shell Company | false | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| Title of 12(b) Security | Common Shares, Without Par Value | ||
| Security Exchange Name | NYSE | ||
| Entity Common Stock, Shares Outstanding | 50,948,146 | ||
| Entity Public Float | $ 1,116,545,985 | ||
| Entity File Number | 001-41830 | ||
| Entity Incorporation, State or Country Code | OH | ||
| Entity Tax Identification Number | 92-2632000 | ||
| Entity Address, Address Line One | 100 West Old Wilson Bridge Road | ||
| Entity Address, City or Town | Columbus | ||
| Entity Address, State or Province | OH | ||
| Entity Address, Postal Zip Code | 43085 | ||
| City Area Code | 614 | ||
| Local Phone Number | 840-3462 | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Documents Incorporated by Reference | DOCUMENTS INCORPORATED BY REFERENCE: Selected portions of the registrant’s definitive proxy statement for its annual meeting of shareholders to be held on September 23, 2026 (the “2026 Proxy Statement”), are incorporated by reference into Part III of this annual report on Form 10-K to the extent provided herein. |
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| Auditor Name | KPMG LLP | ||
| Auditor Location | Detroit, Michigan | ||
| Auditor Firm ID | 185 | ||
| Auditor Opinion [Text Block] | Opinion on the Consolidated and Combined Financial Statements We have audited the accompanying consolidated balance sheets of Worthington Steel, Inc. and subsidiaries (the Company) as of May 31, 2026 and 2025, the related consolidated and combined statements of earnings, comprehensive income, equity and mezzanine equity, and cash flows for each of the years in the three-year period ended May 31, 2026, and the related notes and financial statement schedule II (collectively, the consolidated and combined financial statements). In our opinion, the consolidated and combined financial statements present fairly, in all material respects, the financial position of the Company as of May 31, 2026 and 2025, and the results of its operations and its cash flows for each of the years in the three-year period ended May 31, 2026, in conformity with U.S. generally accepted accounting principles. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of May 31, 2026, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated July 30, 2026 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting. |