Restructuring and Other (Income), Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Aug. 31, 2025	May 31, 2026	May 31, 2025
Restructuring Cost and Reserve [Line Items]
Property, machinery and equipment, net	$ 656.0		$ 548.2
Net proceeds from sale of assets	1.3
Manufacturing Facility
Restructuring Cost and Reserve [Line Items]
Severance expenses	0.4
Machinery And Equipment [Member]
Restructuring Cost and Reserve [Line Items]
Property, machinery and equipment, net	0.3
Pre-tax gain on sale of assets	1.0
Forecast | Manufacturing Facility
Restructuring Cost and Reserve [Line Items]
Severance expenses		$ 0.0
Voluntary Retirement Program
Restructuring Cost and Reserve [Line Items]
Severance expenses	$ 0.4