Impairment of Long-Lived Assets - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Feb. 29, 2024		Feb. 28, 2023		Feb. 29, 2024		Feb. 28, 2023
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charge of long-lived assets	[1]			$ 484				$ 484
Adjusted EBITDA		$ 40,471		37,142		$ 100,804		96,334
Sustainable Energy Solutions
Impaired Long-Lived Assets Held and Used [Line Items]
Adjusted EBITDA		$ (2,667)	[2]	212	[3],[4]	$ (6,434)	[1],[2],[3],[4],[5]	2,932	[2],[3],[4]
Capital Project | Building Products Facility | Jefferson
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charge of long-lived assets				484
Estimated salvage value				$ 70				$ 70

[1] A reconciliation of net earnings from continuing operations (the most comparable GAAP financial measure) to consolidated adjusted EBITDA is included in the MD&A “Results of Operations” section of this Form 10-Q for the respective three and nine months ended February 29, 2024 and February 28, 2023.

[2] Excludes pre-tax charges of $8,103 and $4,774 from separate pension lift-out transactions completed in February 2024 and August 2022, respectively, to transfer the pension benefit obligation under The Gerstenslager Company Bargaining Unit Employees’ Pension Plan to third-party insurance companies.

[3] Excludes the following items reflected in Equity Income in our consolidated statements of earnings: • For the nine months ended February 29, 2024, our share of the gain realized by our engineered cabs joint venture, Workhorse, in connection with the sale of the joint venture’s operations in Brazil, which totaled $2,780 on a pre-tax basis. • For the nine months ended February 28, 2023, the loss realized in connection with the August 3, 2022, sale of our then 50% noncontrolling equity investment in ArtiFlex, or $16,059 on a pre-tax basis, including $300 of transaction costs during the three months ended February 28, 2023.

[4] Reflects reductions in certain corporate overhead costs that no longer exist post-Separation. These costs were included in continuing operations as they represent general corporate overhead that was historically allocated to Worthington Steel but did not meet the requirements to be presented as discontinued operations.

[5] Excludes a pre-tax loss of $1,534 realized in connection with the July 28, 2023, early redemption of the 2026 Notes. The loss resulted primarily from unamortized issuance costs and discount included in the carrying amount of the 2026 Notes and the acceleration of the remaining unamortized loss in equity related to a treasury lock derivative instrument executed in connection with the issuance of the 2026 Notes.