Inventories - Components of Inventories (Details) - USD ($) $ in Thousands		Apr. 30, 2018	Oct. 31, 2017
Inventory Disclosure [Abstract]
Raw materials		$ 19,355	$ 20,065
Work-in-process	[1]	35,900	54,431
Inventories		$ 55,255	$ 74,496

[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 power plant orders or to service our service agreements. Included in work-in-process as of April 30, 2018 and October 31, 2017 was $29.3 million and $46.3 million, respectively, of completed standard components.