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Pension Plans - Retirement-Related Benefit Plans' Impact on Income Before Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Nov. 30, 2024
Nov. 30, 2023
Pension Benefits | U.S. Plans        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 10,804 $ 10,913 $ 21,608 $ 21,826
Interest cost 9,795 8,992 19,590 17,984
Expected return on plan assets (12,017) (10,518) (24,034) (21,036)
Prior service cost (credit) 1 1 1 2
Net actuarial (gains) losses recognized 2,153 4,205 4,306 8,410
Net Periodic Benefit Cost 10,736 13,593 21,471 27,186
Pension Benefits | Non-U.S. Plans        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 1,120 887 2,240 1,774
Interest cost 1,963 1,935 3,926 3,870
Expected return on plan assets (2,376) (2,400) (4,752) (4,800)
Prior service cost (credit) (32) (31) (64) (62)
Net actuarial (gains) losses recognized 294 209 588 418
Net Periodic Benefit Cost 969 600 1,938 1,200
Postretirement Benefits | U.S. Plans        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost 21 22 42 44
Net actuarial (gains) losses recognized (6) (4) (12) (8)
Net Periodic Benefit Cost 15 18 30 36
Postretirement Benefits | Non-U.S. Plans        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 425 569 850 1,138
Interest cost 318 390 636 780
Net actuarial (gains) losses recognized (140) (12) (280) (24)
Net Periodic Benefit Cost $ 603 $ 947 $ 1,206 $ 1,894