Retirement-Related Benefit Plans' Impact on Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Pension Benefits | U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 9,856	$ 9,382	$ 29,568	$ 28,146
Interest cost	5,104	5,497	15,312	16,491
Expected return on plan assets	(8,573)	(8,467)	(25,719)	(25,401)
Prior service cost (credit)	2	29	6	87
Net actuarial (gains) losses recognized	4,629	3,272	13,887	9,816
Net Periodic Benefit (Credit) Cost	11,018	9,713	33,054	29,139
Pension Benefits | Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,391	1,219	4,173	3,657
Interest cost	1,193	1,399	3,579	4,197
Expected return on plan assets	(1,834)	(2,051)	(5,502)	(6,153)
Prior service cost (credit)	(9)	(8)	(27)	(24)
Net actuarial (gains) losses recognized	523	319	1,569	957
Net Periodic Benefit (Credit) Cost	1,264	878	3,792	2,634
Postretirement Benefits | U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	37	48	111	144
Prior service cost (credit)	(55)	(55)	(165)	(165)
Net actuarial (gains) losses recognized	(16)	(6)	(48)	(18)
Net Periodic Benefit (Credit) Cost	(34)	(13)	(102)	(39)
Postretirement Benefits | Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	429	392	1,287	1,176
Interest cost	282	291	846	873
Net actuarial (gains) losses recognized	158	115	474	345
Net Periodic Benefit (Credit) Cost	$ 869	$ 798	$ 2,607	$ 2,394