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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
	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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Nature of business and basis of presentation.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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-Topic 280
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