Changes in Benefit Obligation (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]
Benefit obligation at beginning of year	$ 2,260	$ 2,506
Interest cost	84	41	$ 74
Benefit payments	(207)	(164)
Actuarial (gains)	(369)	(123)
Benefit Obligation at End of Year	1,768	2,260	2,506
Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at beginning of year	30,645	39,974
Service cost	1,951	1,623	1,959
Interest cost	1,374	1,124	1,286
Benefit payments	(557)	(875)
Actuarial (gains)	(276)	(9,240)
Currency exchange rate changes	(2,100)	(1,961)
Benefit Obligation at End of Year	$ 31,037	$ 30,645	$ 39,974