Retirement-Related Benefit Plans' Impact on Income Before Income Taxes (Detail) - Pension Benefits - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 44,520	$ 39,425	$ 37,528
Interest cost	15,223	20,415	21,987
Expected return on plan assets	(33,115)	(34,291)	(33,867)
Prior service cost	8	9	118
Net actuarial losses recognized	30,005	18,516	13,087
Net Pension Cost	56,641	44,074	38,853
Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	6,355	5,400	4,693
Interest cost	5,308	4,842	5,420
Expected return on plan assets	(7,286)	(7,118)	(7,907)
Prior service cost	(150)	(36)	(30)
Net actuarial losses recognized	2,377	2,029	1,229
Curtailment/settlement losses	356	86	89
Net Pension Cost	$ 6,960	$ 5,203	$ 3,494