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, 2020	May 31, 2019
U.S. Plans
Schedule of Net Periodic Benefit Costs and Assumptions for Defined Benefit Postretirement Plans [Line Items]
Net actuarial loss	$ (341,179)	$ (250,286)
Prior service (costs) credits	(20)	(28)
Total recognized in accumulated other comprehensive income not affecting retained earnings	(341,199)	(250,314)
Non-U.S. Plans
Schedule of Net Periodic Benefit Costs and Assumptions for Defined Benefit Postretirement Plans [Line Items]
Net actuarial loss	(48,090)	(51,184)
Prior service (costs) credits	1,098	224
Total recognized in accumulated other comprehensive income not affecting retained earnings	$ (46,992)	$ (50,960)