Discontinued Operations - Summary of Financial Results from Discontinued Operations of Worthington Steel (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023
Other income (expense):
Net earnings attributable to noncontrolling interest	$ 20,507	$ 83,106	$ 59,382
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	757,007	1,670,027	2,637,834
Cost of goods sold	692,171	1,481,731	2,448,319
Gross profit	64,836	188,296	189,515
Selling, general and administrative expense	34,698	74,908	106,110
Impairment of long-lived assets		1,401	312
Restructuring and other expense (income)	1		(4,204)
Separation costs	4,042	18,521	12,021
Operating income	26,095	93,466	75,276
Other income (expense):
Miscellaneous income, net	1,110	1,016	2,146
Interest expense, net	1,849	3,706	6,557
Equity in net income of unconsolidated affiliate	(185)	12,735	3,491
Earnings before income taxes	25,171	103,511	74,356
Income tax expense	4,664	20,405	14,974
Net earnings	20,507	83,106	59,382
Net earnings attributable to noncontrolling interest	3,933	7,460	8,382
Net earnings attributable to controlling interest	$ 16,574	$ 75,646	$ 51,000