Pretax Net Actuarial (Loss) Gain, Prior Service (Cost) and Transition Assets/(Obligation) Recognized in Accumulated Other Comprehensive Income (Loss) not Affecting Retained Earnings, Postretirement (Detail) - Postretirement Benefits - USD ($) $ in Thousands	May 31, 2022	May 31, 2021
Domestic
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial (loss) gain	$ (314)	$ (497)
Prior service credit	121	281
Total recognized in accumulated other comprehensive income not affecting retained earnings	(193)	(216)
Non-U.S. Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial (loss) gain	3,878	(5,901)
Total recognized in accumulated other comprehensive income not affecting retained earnings	$ 3,878	$ (5,901)