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Pension and other postretirement plans - Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2022
Apr. 30, 2021
Pension Plans | United States        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4,728 $ 5,722 $ 9,915 $ 11,488
Interest cost 4,241 3,494 7,824 6,834
Expected return on plan assets (8,511) (7,335) (16,389) (14,088)
Amortization of prior service cost (credit) 12 (21) 24 (41)
Amortization of net actuarial (gain) loss 2,318 4,042 5,084 7,616
Settlement loss 41,221 2,018 41,221 2,018
Total benefit cost 44,009 7,920 47,679 13,827
Pension Plans | International        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 431 662 920 1,180
Interest cost 290 250 588 470
Expected return on plan assets (367) (431) (761) (822)
Amortization of prior service cost (credit) (13) (88) (30) (165)
Amortization of net actuarial (gain) loss 593 1,011 1,200 1,801
Settlement loss 0 0 0 0
Total benefit cost 934 1,404 1,917 2,464
Postretirement Benefit Costs | United States        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 148 216 343 392
Interest cost 474 456 962 910
Amortization of net actuarial (gain) loss 226 338 489 685
Total benefit cost 848 1,010 1,794 1,987
Postretirement Benefit Costs | International        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 3 6 7
Interest cost 3 3 6 6
Amortization of net actuarial (gain) loss (12) (10) (24) (20)
Total benefit cost $ (6) $ (4) $ (12) $ (7)