Components of Net Postretirement Expense (Detail) - Postretirement Benefits - USD ($) $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Domestic
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 84	$ 41	$ 74
Prior service (credit)	(121)	(161)	(167)
Net actuarial losses (gains)	43	61	42
Net Pension Cost	6	(59)	(51)
Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,951	1,623	1,959
Interest cost	1,374	1,124	1,286
Net actuarial losses (gains)	(51)	121	590
Net Pension Cost	$ 3,274	$ 2,868	$ 3,835