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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2025 | May 31, 2024 | May 31, 2023
Worthington Steel | Long Term Steel Supply Agreement |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases from affiliates | $ 113,400 | $ 65,920 |
Accounts payable related to purchases from related party | $ 9,099 | 9,637 |
The Separation of Worthington Steel |  |  |
Related Party Transaction [Line Items] |  |  |
Direct and incremental costs |  | 31,226 | $ 24,048
Direct and incremental costs attributed to discontinued operations |  | $ 18,521 | $ 17,514

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