Restructuring and Other Income, Net - Schedule of Progression of Liabilities Associated with Restructuring Activities, Combined with Reconciliation to Restructuring and Other Income, Net (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021
Restructuring Cost and Reserve [Line Items]
Net gain on sale of assets	[1],[2]			$ 5,467
Restructuring and other income, net		$ (4,282)	$ (2,004)	(5,382)	$ (14,278)
Early Retirement And Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance				541
Expense (Income)				85
Payments				(605)
Ending Balance		$ 21		$ 21

[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, the Company’s 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 general representations and warranties. The transaction resulted in a pre-tax gain of $3,926,000. The assets were classified in assets held for sale on the consolidated balance sheets immediately prior to the closing of the sale.