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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
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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%

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