Inventories - Components of Inventories (Details) - USD ($) $ in Thousands		Jul. 31, 2017	Oct. 31, 2016
Inventory Disclosure [Abstract]
Raw materials		$ 22,525	$ 25,286
Work-in-process	[1]	49,459	48,520
Inventories		$ 71,984	$ 73,806

[1] Included in work-in-process as of July 31, 2017 and October 31, 2016 was $40.1 million and $40.6 million, respectively, of completed standard components.