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		6 Months Ended
		Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Significant non-cash operating items:
Equity in income of unconsolidated affiliate, net of distributions		$ (4,268)	$ 4,129	$ (7,721)	$ (6,096)
Stock-based compensation		5,937	6,175	9,862	10,691
Significant investing activities:
Investment in property, plant and equipment		(15,161)	(32,876)	(24,790)	(62,174)
Acquisitions, net of cash acquired		$ 731	(21,013)	$ (88,156)	(21,013)
Significant financing activities:
Net proceeds from short-term borrowings	[1]		175,000		172,187
Discontinued Operations
Significant non-cash operating items:
Depreciation and amortization			15,793		32,043
Impairment of long-lived assets					1,401
Equity in income of unconsolidated affiliate, net of distributions			(3,777)		(12,734)
Stock-based compensation			2,315		3,472
Significant investing activities:
Investment in property, plant and equipment			(13,682)		(33,457)
Acquisitions, net of cash acquired			(21,013)		(21,013)
Significant financing activities:
Net proceeds from short-term borrowings			$ 175,000		$ 172,187

[1] Net proceeds in fiscal 2024 consisted of borrowings under Worthington Steel’s short-term credit facilities assumed by Worthington Steel in conjunction with the Separation.