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, 2021	Oct. 31, 2020	Oct. 31, 2019
Exxon Mobile Research And Engineering Company [member]
Nature Of Business And Basis Of Presentation [Line Items]
Significant customer revenue percentage	29.00%	32.00%	40.00%
Connecticut Light And Power. [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Significant customer revenue percentage	20.00%	17.00%	11.00%
Korea Southern Power Company [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Significant customer revenue percentage	12.00%
US Department Of Energy. [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Significant customer revenue percentage	8.00%	9.00%	6.00%
UIL Holding Corporation [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Significant customer revenue percentage	5.00%	18.00%	1.00%
Pfizer, Inc. [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Significant customer revenue percentage	5.00%	4.00%	6.00%
Dominion Bridgeport Fuel Cell, LLC [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Significant customer revenue percentage			13.00%