Restructuring and Other (Income) Expense, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Feb. 28, 2026	Aug. 31, 2025	Feb. 28, 2026	May 31, 2026	May 31, 2025
Restructuring Cost and Reserve [Line Items]
Property, machinery and equipment, net	$ 677.9		$ 677.9		$ 548.2
Net proceeds from sale of assets	1.3	$ 1.3
Finance lease assets and buildings and improvements, net	9.4		9.4		$ 0.0
Gross proceeds from sale of finance lease assets and buildings and improvements, net	14.7
Net cash proceeds from sale of finance lease assets and buildings and improvements, net	14.1
Manufacturing Facility
Restructuring Cost and Reserve [Line Items]
Severance expenses			0.5
Machinery And Equipment [Member]
Restructuring Cost and Reserve [Line Items]
Property, machinery and equipment, net	0.3	0.3	0.3
Pre-tax gain on sale of assets	1.0	$ 1.0
Finance Lease Assets and Buildings and Improvements, Net
Restructuring Cost and Reserve [Line Items]
Property, machinery and equipment, net	9.7		9.7
Pre-tax gain on sale of assets	$ 5.0
Forecast | Manufacturing Facility
Restructuring Cost and Reserve [Line Items]
Severance expenses				$ 0.0
Voluntary Retirement Program
Restructuring Cost and Reserve [Line Items]
Severance expenses			$ 1.0