Pension Plans - Retirement-Related Benefit Plans' Impact on Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2025	Nov. 30, 2024	Nov. 30, 2025	Nov. 30, 2024
Pension Benefits | U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 10,863	$ 10,804	$ 21,726	$ 21,608
Interest cost	9,484	9,795	18,968	19,590
Expected return on plan assets	(13,326)	(12,017)	(26,652)	(24,034)
Prior service cost (credit)	1	1	1	1
Net actuarial losses (gains) recognized	1,448	2,153	2,896	4,306
Net Periodic Benefit Cost	8,470	10,736	16,939	21,471
Pension Benefits | Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,467	1,120	2,934	2,240
Interest cost	2,028	1,963	4,056	3,926
Expected return on plan assets	(2,506)	(2,376)	(5,012)	(4,752)
Prior service cost (credit)	(25)	(32)	(50)	(64)
Net actuarial losses (gains) recognized	323	294	646	588
Net Periodic Benefit Cost	1,287	969	2,574	1,938
Postretirement Benefits | U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	12	21	24	42
Net actuarial losses (gains) recognized	9	(6)	18	(12)
Net Periodic Benefit Cost	21	15	42	30
Postretirement Benefits | Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	234	425	468	850
Interest cost	272	318	544	636
Net actuarial losses (gains) recognized	(256)	(140)	(512)	(280)
Net Periodic Benefit Cost	$ 250	$ 603	$ 500	$ 1,206