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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, 2024 | Apr. 30, 2023 | Apr. 30, 2024 | Apr. 30, 2023
Pension Plans | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 234 | $ 283 | $ 471 | $ 558
Interest cost | 685 | 642 | 1,374 | 1,245
Expected return on plan assets | (416) | (383) | (833) | (760)
Amortization of prior service credit | (2) | (13) | (4) | (26)
Amortization of net actuarial gain | 8 | 21 | 17 | 41
Total benefit cost | 509 | 550 | 1,025 | 1,058
Pension Plans | United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 2,507 | 2,744 | 5,015 | 5,488
Interest cost | 4,752 | 4,176 | 9,505 | 8,351
Expected return on plan assets | (6,652) | (6,529) | (13,306) | (13,058)
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of net actuarial gain | 0 | 0 | 0 | 0
Total benefit cost | 607 | 391 | 1,214 | 781
Postretirement Benefit Costs | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1 | 1 | 2 | 2
Interest cost | 3 | 3 | 7 | 6
Amortization of net actuarial gain | (14) | (15) | (29) | (31)
Total benefit cost | (10) | (11) | (20) | (23)
Postretirement Benefit Costs | United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 70 | 100 | 141 | 200
Interest cost | 754 | 766 | 1,508 | 1,531
Amortization of net actuarial gain | (147) | 0 | (295) | 0
Total benefit cost | $ 677 | $ 866 | $ 1,354 | $ 1,731

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