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, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 152	$ 154	$ 373	$ 376
Interest cost	650	565	1,278	1,152
Amortization of prior service cost (credit)	(25)	(41)	(50)	(82)
Amortization of net actuarial (gain) loss	296	205	545	434
Total benefit cost	1,073	883	2,146	1,880
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	5	10	9
Interest cost	5	5	10	10
Amortization of net actuarial (gain) loss	(5)	(4)	(10)	(8)
Total benefit cost	$ 5	$ 6	$ 10	$ 11