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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
	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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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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