Project Assets - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2020 USD ($) ProjectAsset	Jul. 31, 2019 USD ($)	Oct. 31, 2019 USD ($) ProjectAsset
Project Assets [Line Items]
Long-term project assets	$ 160,921	$ 160,921		$ 160,921		$ 144,115
Number of project assets | ProjectAsset				8		7
Sale leaseback transaction, net book value	74,800	74,800		$ 74,800		$ 59,200
Cash restricted for PNC Sale-Leaseback transactions	15,026	15,026		15,026		17,934
Unrestricted cash and cash equivalents	66,300	66,300		66,300		9,400
Project asset depreciation		3,100	$ 2,700	8,600	$ 4,700
Long-term project assets construction in progress	86,100	86,100		86,100		$ 84,900
UCI Fuel Cell, LLC [Member] | PNC Energy Capital, LLC [Member]
Project Assets [Line Items]
Sale leaseback transaction expense	4,300
Cash restricted for PNC Sale-Leaseback transactions	3,000	3,000		3,000
Unrestricted cash and cash equivalents	$ 1,300	$ 1,300		$ 1,300