v3.26.1
Accumulated Other Comprehensive Income (loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 2,886,782 $ 2,512,225 $ 2,143,000
Ending Balance 3,313,105 2,886,782 2,512,225
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (470,851) (461,847) (465,375)
Current period comprehensive (loss) income (42,178) (5,505) 3,276
Income taxes associated with current period comprehensive income (loss) (155) (1,260) 252
Income taxes reclassified into earnings   (2,239)  
Ending Balance (428,828) (470,851) (461,847)
Pension And Other Postretirement Benefit Liability Adjustments, Net of Tax      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (72,661) (84,647) (148,764)
Current period comprehensive (loss) income (51,562) 6,872 66,592
Income taxes associated with current period comprehensive income (loss) (12,221) (2,004) (15,769)
Amounts reclassified from accumulated other comprehensive income (loss) 6,542 9,394 17,416
Income taxes reclassified into earnings (1,540) (2,276) (4,122)
Ending Balance (28,318) (72,661) (84,647)
Unrealized Gain On Derivatives, Net of Tax      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 11,405 11,405 11,405
Amounts reclassified from accumulated other comprehensive income (loss) (0)    
Ending Balance 11,405 11,405 11,405
Unrealized Gain (Loss) On Securities, Net of Tax      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (1,524) (2,201) (2,201)
Current period comprehensive (loss) income 115 1,086 205
Income taxes associated with current period comprehensive income (loss) (14) (116) (56)
Amounts reclassified from accumulated other comprehensive income (loss) (38) (332) (165)
Income taxes reclassified into earnings 2 39 16
Ending Balance (1,459) (1,524) (2,201)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (533,631) (537,290) (604,935)
Current period comprehensive (loss) income 93,855 2,453 70,073
Income taxes associated with current period comprehensive income (loss) (12,390) (3,380) (15,573)
Amounts reclassified from accumulated other comprehensive income (loss) 6,504 9,062 17,251
Income taxes reclassified into earnings (1,538) (4,476) (4,106)
Ending Balance $ (447,200) $ (533,631) $ (537,290)