Retirement-Related Benefit Plans' Impact on Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Pension Benefits | U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 11,914	$ 11,130	$ 23,828	$ 22,260
Interest cost	3,842	3,806	7,684	7,612
Expected return on plan assets	(10,386)	(8,279)	(20,772)	(16,558)
Prior service cost (credit)	1	2	2	4
Net actuarial losses recognized	4,225	7,501	8,450	15,002
Net Periodic Benefit (Credit) Cost	9,596	14,160	19,192	28,320
Pension Benefits | Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,348	1,406	2,696	2,812
Interest cost	1,282	1,122	2,564	2,244
Expected return on plan assets	(2,073)	(1,607)	(4,146)	(3,214)
Prior service cost (credit)	(38)	(35)	(76)	(70)
Net actuarial losses recognized	114	526	228	1,052
Net Periodic Benefit (Credit) Cost	633	1,412	1,266	2,824
Postretirement Benefits | U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	10	19	20	38
Prior service cost (credit)	(40)	(42)	(80)	(84)
Net actuarial losses recognized	15	10	30	20
Net Periodic Benefit (Credit) Cost	(15)	(13)	(30)	(26)
Postretirement Benefits | Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	432	431	864	862
Interest cost	299	283	598	566
Net actuarial losses recognized	32	130	64	260
Net Periodic Benefit (Credit) Cost	$ 763	$ 844	$ 1,526	$ 1,688