Pension and Other Postretirement Plans - Other Postretirement Benefit Cost (Detail) - Postretirement Benefit Costs [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 143	$ 165	$ 333	$ 331
Interest cost	558	749	1,173	1,497
Amortization of prior service credit	(4)	(6)	(8)	(13)
Amortization of net actuarial (gain) loss	258	152	677	304
Total benefit cost	955	1,060	2,175	2,119
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	6	7	9
Interest cost	3	6	7	11
Amortization of net actuarial (gain) loss	(9)	(9)	(18)	(16)
Total benefit cost	$ (2)	$ 3	$ (4)	$ 4