Inventories - Components of Inventories (Details) - USD ($) $ in Thousands		Apr. 30, 2019	Oct. 31, 2018
Inventory Disclosure [Abstract]
Raw materials		$ 25,228	$ 24,467
Work-in-process	[1]	31,815	29,108
Inventories		$ 57,043	$ 53,575

[1] Work-in-process includes the standard components of inventory used to build the typical modules or module components that are intended to be used in future project asset construction, power plant orders or for use under the Company’s service agreements. Included in work-in-process as of April 30, 2019 and October 31, 2018 was $21.2 million and $19.0 million, respectively, of completed standard components.