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, 2023	May 31, 2022
Domestic
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial gain (loss)	$ (99)	$ (314)
Prior service credit		121
Total recognized in accumulated other comprehensive income not affecting retained earnings	(99)	(193)
Non-U.S. Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial gain (loss)	3,838	3,878
Total recognized in accumulated other comprehensive income not affecting retained earnings	$ 3,838	$ 3,878