Components of Net Postretirement Expense (Detail) - Postretirement Benefits - USD ($) $ in Thousands	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Domestic
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost on the accumulated obligation	$ 41	$ 74	$ 149
Prior service (credit)	(161)	(167)	(219)
Net actuarial losses (gains)	61	42	(66)
Net Pension Cost	(59)	(51)	(136)
Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost - benefits earned during the period	1,623	1,959	1,661
Interest cost on the accumulated obligation	1,124	1,286	1,089
Net actuarial losses (gains)	121	590	611
Net Pension Cost	$ 2,868	$ 3,835	$ 3,361