Restructuring and Other Expense (Income), Net - Schedule of Progression of Liabilities Associated with Restructuring Activities, Combined with Reconciliation to Restructuring and Other Expense (Income), Net (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Restructuring Cost and Reserve [Line Items]
Net gain on sale of assets	[1],[2]			$ (5,466)
Restructuring and other expense (income), net		$ 824	$ (504)	(4,558)	$ (14,782)
Early Retirement And Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance				541
Expense (Income)				908
Payments				(1,083)
Ending Balance		$ 366		$ 366

[1] On June 14, 2022, we sold real property in Tulsa, Oklahoma, for net cash proceeds of $5,775,000, resulting in a pre-tax gain of $1,177,000. These assets had been excluded from the sale of our former oil & gas equipment business in January 2021. The assets were classified in assets held for sale on the consolidated balance sheets immediately prior to the closing of the sale.

[2] On October 31, 2022, our consolidated steel processing joint venture, WSP, sold its remaining manufacturing facility, located in Jackson, Michigan. Net proceeds of $21,277,000 were realized in connection with the transaction, of which $2,000,000 is being held in escrow for contingent indemnification obligations associated with general representations and warranties. The transaction resulted in a pre-tax gain of $3,926,000. The assets had a net book value of $14,263,000 and were classified as assets held for sale on the consolidated balance sheet as of May 31, 2022.