Discontinued Operations - Summary of Financial Results from Discontinued Operations of Worthington Steel (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Other income (expense)
Net earnings attributable to noncontrolling interest	$ 82,841	$ 143,419	$ 241,316
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	1,670,027	3,497,896	3,933,030
Cost of goods sold	1,481,731	3,158,172	3,545,822
Gross profit	188,296	339,724	387,208
Selling, general and administrative expense	74,908	141,754	118,138
Impairment of long-lived assets	1,401	2,112	3,076
Restructuring and other income, net		(4,204)	(14,480)
Separation costs	18,521	17,514
Operating income	93,466	182,548	280,474
Other income (expense)
Miscellaneous income, net	1,016	3,270	862
Interest expense, net	(3,706)	(8,461)	(7,485)
Equity in net income of unconsolidated affiliate	12,735	7,725	29,786
Earnings before income taxes	103,511	185,082	303,637
Income tax expense	20,670	41,663	62,321
Net earnings	82,841	143,419	241,316
Net earnings attributable to noncontrolling interest	7,460	12,642	19,878
Net earnings attributable to controlling interest	$ 75,381	$ 130,777	$ 221,438