Pretax Net Actuarial Loss and Prior Service (Costs) Recognized in Accumulated Other Comprehensive Income (Loss) not Affecting Retained Earnings,Pension (Detail) - Pension Benefits - USD ($) $ in Thousands	May 31, 2021	May 31, 2020
U.S. Plans
Schedule of Net Periodic Benefit Costs and Assumptions for Defined Benefit Postretirement Plans [Line Items]
Net actuarial loss	$ (250,317)	$ (341,179)
Prior service (costs) credits	(12)	(20)
Total recognized in accumulated other comprehensive income not affecting retained earnings	(250,329)	(341,199)
Non-U.S. Plans
Schedule of Net Periodic Benefit Costs and Assumptions for Defined Benefit Postretirement Plans [Line Items]
Net actuarial loss	(30,045)	(48,090)
Prior service (costs) credits	1,023	1,098
Total recognized in accumulated other comprehensive income not affecting retained earnings	$ (29,022)	$ (46,992)