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, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 165	$ 144	$ 331	$ 356
Interest cost	749	658	1,497	1,295
Amortization of prior service credit	(6)	(25)	(13)	(50)
Amortization of net actuarial (gain) loss	152	296	304	545
Total benefit cost	1,060	1,073	2,119	2,146
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	9	10
Interest cost	6	5	11	10
Amortization of net actuarial (gain) loss	(9)	(5)	(16)	(10)
Total benefit cost	$ 3	$ 5	$ 4	$ 10