Segment Operations - Financial Information for Reportable Segments (Detail) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Feb. 29, 2024		Feb. 28, 2023		Feb. 29, 2024		Feb. 28, 2023		May 31, 2023
Segment Reporting Information [Line Items]
Net sales	[1]	$ 316,755		$ 346,315		$ 926,902		$ 1,049,694
Impairment of long-lived assets	[1]			484				484
Restructuring and other expense (income), net	[1]	698		823		704		(354)
Separation costs	[1]	2,999		2,305		12,465		3,572
Miscellaneous income (expense), net	[1]	(6,995)		217		(5,983)		(4,499)
Loss on extinguishment of debt						1,534
Equity income	[1]	43,235		37,111		127,328		102,004
Adjusted EBITDA		40,471		37,142		100,804		96,334
Total assets of continuing operations		1,704,689				1,704,689				$ 3,650,918
Continuing Operations
Segment Reporting Information [Line Items]
Total assets of continuing operations		1,704,689				1,704,689				1,890,122
Consumer products
Segment Reporting Information [Line Items]
Net sales		133,181		130,684		369,923		406,479
Restructuring and other expense (income), net				206				206
Miscellaneous income (expense), net		12		(12)		49		(78)
Adjusted EBITDA		25,649	[2]	21,100	[3],[4]	52,537	[1],[2],[3],[4],[5]	67,846	[2],[3],[4]
Total assets of continuing operations		566,715				566,715				544,911
Building Products
Segment Reporting Information [Line Items]
Net sales		148,190		183,839		465,421		542,536
Impairment of long-lived assets				484				484
Restructuring and other expense (income), net		84		617		84		617
Miscellaneous income (expense), net		154		122		452		405
Equity income		43,813		37,836		124,032		116,809
Adjusted EBITDA		53,059	[2]	58,097	[3],[4]	158,501	[1],[2],[3],[4],[5]	157,458	[2],[3],[4]
Total assets of continuing operations		678,699				678,699				706,169
Sustainable Energy Solutions
Segment Reporting Information [Line Items]
Net sales		35,384		31,792		91,558		100,679
Miscellaneous income (expense), net		328		(37)		1,165		19
Adjusted EBITDA		(2,667)	[2]	212	[3],[4]	(6,434)	[1],[2],[3],[4],[5]	2,932	[2],[3],[4]
Total assets of continuing operations		144,543				144,543				129,872
Unallocated Corporate and Other
Segment Reporting Information [Line Items]
Restructuring and other expense (income), net		614				620		(1,177)
Separation costs		2,999		2,305		12,465		3,572
Miscellaneous income (expense), net		(7,489)		144		(7,649)		(4,845)
Loss on extinguishment of debt						(1,534)
Equity income		(578)		(725)		3,296		(14,805)
Adjusted EBITDA		(9,170)	[2]	(9,193)	[3],[4]	(16,775)	[1],[2],[3],[4],[5]	(15,948)	[2],[3],[4]
Total assets of continuing operations		314,732				314,732				$ 509,170
Consolidated
Segment Reporting Information [Line Items]
Loss on extinguishment of debt	[1]					(1,534)
Adjusted EBITDA	[1]	$ 66,871	[2]	$ 70,216	[3],[4]	$ 187,829	[2],[3],[4],[5]	$ 212,288	[2],[3],[4]

[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.