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 ($)	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 0	$ 500,000
Expense (income)		100,000
Payments		(600,000)
Adjustments		0
Ending Balance	0	0	$ 500,000
Net gain on sale of assets		(4,300,000)
Restructuring and other income, net	0	(4,200,000)	(14,500,000)
Early Retirement And Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 0	500,000
Expense (income)		100,000
Payments		(600,000)
Adjustments		0
Ending Balance		$ 0	$ 500,000