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Nature of Business, Basis of Presentation and Significant Accounting Policies - Percent of Customer Consolidated Revenues (Details) - Revenue Benchmark - Customer Concentration Risk | 12 Months Ended
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Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2022
Connecticut Light And Power |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 21.00% | 13.00% | 14.00%
Gyeonggi Green Energy Co., Ltd. ("GGE") |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 18.00% |  |
Esso Nederland B.V. ("Esso") |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 10.00% | 2.00% |
ExxonMobil Technology and Engineering Company (f/k/a ExxonMobil Research and Engineering Company) (EMTEC) |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 8.00% | 8.00% | 8.00%
Ameresco/Sacramento Sewer |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 7.00% |  |
Korea Southern Power Company (KOSPO) |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 1.00% | 31.00% | 6.00%
Korea Fuel Cell Co., Ltd (KFC) |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage |  | 16.00% | 46.00%
Top Customers |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |
Significant customer revenue percentage | 65.00% | 70.00% | 74.00%

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