Discontinued Operations - Summary of Significant Non Cash Operating Items and Capital Expenditures of Discontinued Operations Included in Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023
Significant non-cash operating items:
Impairment of long-lived assets		$ 0	$ 484	$ 0	$ 484
Equity in income of unconsolidated affiliate		2,926	(23,218)	(3,169)	(84,415)
Net loss (gain) on sale of assets		(14)	46	(348)	(4,988)
Stock-based compensation		2,602	4,975	13,294	13,758
Significant investing activities:
Investment in property, plant and equipment		(10,017)	(22,748)	(72,191)	(68,715)
Acquisitions, net of cash acquired		(8,707)		(29,721)	(56,088)
Significant financing activities:
Payment to related party		$ 218,048		218,048
Net proceeds from short-term borrowings	[1]		(1,330)	172,187	(44,392)
Discontinued Operations
Significant non-cash operating items:
Depreciation and amortization			16,260	32,043	50,306
Impairment of long-lived assets				1,401	312
Equity in income of unconsolidated affiliate			10,185	(12,734)	6,509
Net loss (gain) on sale of assets			46	(412)	(3,778)
Stock-based compensation			1,211	3,472	3,340
Significant investing activities:
Investment in property, plant and equipment			$ (10,809)	(33,457)	$ (36,450)
Acquisitions, net of cash acquired				(21,013)
Significant financing activities:
Net proceeds from short-term borrowings				$ 172,187

[1] Net proceeds in the nine months ended February 29, 2024 consisted of borrowings under short-term credit facilities assumed by Worthington Steel in conjunction with the Separation.