Changes in Benefit Obligation (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]
Benefit obligation at beginning of year	$ 2,506	$ 4,182
Interest cost	41	74	$ 149
Benefit payments	(164)	(1,902)
Actuarial (gains) losses	(123)	152
Benefit Obligation at End of Year	2,260	2,506	4,182
Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at beginning of year	39,974	38,389
Service cost	1,623	1,959	1,661
Interest cost	1,124	1,286	1,089
Benefit payments	(875)	(673)
Actuarial (gains) losses	(9,240)	(6,415)
Currency exchange rate changes	(1,961)	5,428
Benefit Obligation at End of Year	$ 30,645	$ 39,974	$ 38,389