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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, 2022 | Oct. 31, 2021 | Oct. 31, 2020
Korea Fuel Cell Co. Limited [Member] |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 46.00% |  |
Connecticut Light And Power. [Member] |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 14.00% | 20.00% | 17.00%
ExxonMobil Technology and Engineering Company [Member] |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 8.00% | 29.00% | 32.00%
Korea Southern Power Company [Member] |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 6.00% | 12.00% |
US Department Of Energy. [Member] |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 6.00% | 8.00% | 9.00%
Long Island Power Authority [Member] |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 5.00% |  |
Pfizer, Inc. [Member] |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 2.00% | 5.00% | 4.00%
UIL Holding Corporation [Member] |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage |  | 5.00% | 18.00%
Top Customers [Member] |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 87.00% | 79.00% | 80.00%

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