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