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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, 2020	Oct. 31, 2019	Oct. 31, 2018
Concentration Risk [Line Items]
Significant customer revenue percentage		86.00%	81.00%	88.00%
ExxonMobil Research and Engineering Company (EMRE) [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage		32.00%	40.00%	6.00%
UIL Holdings Corporation [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage		18.00%	1.00%	2.00%
Connecticut Light and Power [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage		17.00%	11.00%	0.00%
U.S. Department of Energy (DOE) [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage		9.00%	6.00%	8.00%
Clearway Energy (formerly NRG Yield, Inc.) [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage		6.00%	1.00%	15.00%
Pfizer, Inc. [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage		4.00%	6.00%	4.00%
Dominion Bridgeport FuelCell Park [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage	[1]	0.00%	13.00%	3.00%
Posco Energy
Concentration Risk [Line Items]
Significant customer revenue percentage		0.00%	3.00%	5.00%
Hanyang Industrial Development Co., Ltd. (HYD) [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage		0.00%	0.00%	35.00%
AEP Onsite Partners, LLC [Member]
Concentration Risk [Line Items]
Significant customer revenue percentage		0.00%	0.00%	10.00%
[1] All of the outstanding membership interests in Dominion Bridgeport Fuel Cell, LLC were acquired by the Company on May 9, 2019.  As a result of this acquisition, revenue is now (subsequent to the acquisition) recognized under the related PPA for electricity sales to Connecticut Light and Power.

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