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Retirement-Related Benefit Plans' Impact on Income Before Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2021
Aug. 31, 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
Interest cost 3,842 3,806
Expected return on plan assets (10,386) (8,279)
Prior service cost (credit) 1 2
Net actuarial losses recognized 4,225 7,501
Net Periodic Benefit (Credit) Cost 9,596 14,160
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
Interest cost 1,282 1,122
Expected return on plan assets (2,073) (1,607)
Prior service cost (credit) (38) (35)
Net actuarial losses recognized 114 526
Net Periodic Benefit (Credit) Cost 633 1,412
Postretirement Benefits | U.S. Plans    
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost 10 19
Prior service cost (credit) (40) (42)
Net actuarial losses recognized 15 10
Net Periodic Benefit (Credit) Cost (15) (13)
Postretirement Benefits | Non-U.S. Plans    
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 432 431
Interest cost 299 283
Net actuarial losses recognized 32 130
Net Periodic Benefit (Credit) Cost $ 763 $ 844