Nature of Business, Basis of Presentation and Significant Accounting Policies - Percent of Customer Consolidated Revenues (Details) - Sales Revenue Net [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Concentration Risk [Line Items]
Significant customer revenue percentage	84.00%	78.00%	75.00%
Hanyang Industrial Development Co., LTD [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage	35.00%	40.00%	0.00%
POSCO Energy [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage	5.00%	6.00%	48.00%
Clearway Energy (formerly NRG Yield, Inc.) [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage	15.00%	0.00%	0.00%
AEP Onsite Partners, LLC [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage	10.00%	0.00%	0.00%
U.S. Department of Energy [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage	8.00%	9.00%	8.00%
ExxonMobil [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage	6.00%	9.00%	3.00%
Dominion Bridgeport FuelCell Park [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage	3.00%	11.00%	6.00%
Avangrid Holdings (through its various subsidiaries) [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage	2.00%	3.00%	10.00%