Acquisition (Details) $ in Thousands		12 Months Ended
	May 09, 2019 USD ($) MW	Oct. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)
Business Acquisition [Line Items]
Restricted cash		$ 27,999	$ 42,185
Bridgeport Fuel Cell, LLC [Member]
Business Acquisition [Line Items]
Business acquisition, cash purchase price	$ 35,500
Working capital post-closing adjustment for purchase price	1,000
Purchase price, estimated working capital adjustment	600
Accounts receivable	2,700
Accrued performance guarantees	1,300
Unbilled receivables	15,300
Assets acquired, fuel cell power plants installation	38,800
Assets acquired, power purchase agreement	12,300
Gain or loss recorded for pre-existing service agreement	$ 0
Remaining amortization period		10 years
Bridgeport Fuel Cell, LLC [Member] | Project Assets [Member] | Balance Of Plant Assets
Business Acquisition [Line Items]
Project assets estimated remaining useful lives		15 years
Bridgeport Fuel Cell, LLC [Member] | Project Assets [Member] | Minimum [Member] | Fuel Cell Modules
Business Acquisition [Line Items]
Project assets estimated remaining useful lives		1 year
Bridgeport Fuel Cell, LLC [Member] | Project Assets [Member] | Maximum [Member] | Fuel Cell Modules
Business Acquisition [Line Items]
Project assets estimated remaining useful lives		7 years
Bridgeport Fuel Cell, LLC [Member] | CONNECTICUT
Business Acquisition [Line Items]
Capacity Of Plant | MW	14.9
Plant operation period	2013-12
Bridgeport Fuel Cell Project [Member]
Business Acquisition [Line Items]
Restricted cash	$ 15,000