Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	May 31, 2021	May 31, 2020
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, at cost	$ 1,967,482	$ 1,755,190
Less: allowance for depreciation and amortization	1,002,300	905,504
Property, plant and equipment, net	965,182	849,686
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, at cost	93,455	85,860
Building And Leasehold Improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, at cost	518,205	469,483
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, at cost	$ 1,355,822	$ 1,199,847