| Document And Entity Information | Mar. 20, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 20, 2024 |
| Entity Registrant Name | WORTHINGTON STEEL, INC. |
| Entity Central Index Key | 0001968487 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-41830 |
| Entity Incorporation, State or Country Code | OH |
| Entity Tax Identification Number | 92-2632000 |
| Entity Address, Address Line One | 100 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Shares, without par value |
| Trading Symbol | WS |
| Security Exchange Name | NYSE |
