Retirement-Related Benefit Plans' Impact on Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Pension Benefits | U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 11,130	$ 9,856	$ 33,390	$ 29,568
Interest cost	3,806	5,104	11,418	15,312
Expected return on plan assets	(8,279)	(8,573)	(24,837)	(25,719)
Prior service cost (credit)	2	2	6	6
Net actuarial (gains) losses recognized	7,501	4,629	22,503	13,887
Net Periodic Benefit (Credit) Cost	14,160	11,018	42,480	33,054
Pension Benefits | Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,406	1,391	4,218	4,173
Interest cost	1,122	1,193	3,366	3,579
Expected return on plan assets	(1,607)	(1,834)	(4,821)	(5,502)
Prior service cost (credit)	(35)	(9)	(105)	(27)
Net actuarial (gains) losses recognized	526	523	1,578	1,569
Net Periodic Benefit (Credit) Cost	1,412	1,264	4,236	3,792
Postretirement Benefits | U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	19	37	57	111
Prior service cost (credit)	(42)	(55)	(126)	(165)
Net actuarial (gains) losses recognized	10	(16)	30	(48)
Net Periodic Benefit (Credit) Cost	(13)	(34)	(39)	(102)
Postretirement Benefits | Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	431	429	1,293	1,287
Interest cost	283	282	849	846
Net actuarial (gains) losses recognized	130	158	390	474
Net Periodic Benefit (Credit) Cost	$ 844	$ 869	$ 2,532	$ 2,607