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Commitments and Contingencies - Additional Information (Details) $ in Thousands				1 Months Ended	6 Months Ended	12 Months Ended	18 Months Ended
	Sep. 14, 2020 USD ($) item	Jun. 28, 2020 USD ($)	Apr. 27, 2020 USD ($)	Oct. 31, 2020 USD ($)	Apr. 30, 2022 USD ($) project MW	Oct. 31, 2021 USD ($)	Apr. 30, 2022 USD ($)	Dec. 20, 2021 USD ($)
Commitments And Contingencies [Line Items]
Recorded unconditional purchase obligation					$ 95,800		$ 95,800
Loss contingency, damages sought				$ 880,000
Total number of projects | project					3
Impairment charges					$ 7,200	$ 2,800	10,000
Long Term Project Assets					239,864	$ 223,277	239,864
POSCO Energy Settlement Agreement
Commitments And Contingencies [Line Items]
Unspecified warranty claims	$ 1,000
Accounts receivable outstanding					$ 11,200
Contingent liability								$ 1,800
Number of counts | item	4
Tulare Biomart Project
Commitments And Contingencies [Line Items]
Term for procuring fuel					20 years
LIPA project
Commitments And Contingencies [Line Items]
Term for procuring fuel					7 years
LIPA project | Maximum
Commitments And Contingencies [Line Items]
Term for procuring fuel					18 years
CT-RFP 2 Derby 14.9 Mega Watt Project
Commitments And Contingencies [Line Items]
Under construction power plant capacity | MW					14.0
SCEF-Derby 208 Mega Watt Project
Commitments And Contingencies [Line Items]
Under construction power plant capacity | MW					2.8
Toyota
Commitments And Contingencies [Line Items]
Long Term Project Assets					$ 20,700		20,700
Derby Project 14.0 Mega Watt
Commitments And Contingencies [Line Items]
Under construction power plant capacity | MW					14.0
Long Term Project Assets					$ 18,300		18,300
Derby Project 2.8 Mega Watt
Commitments And Contingencies [Line Items]
Under construction power plant capacity | MW					2.8
Long Term Project Assets					$ 200		200
Bridgeport
Commitments And Contingencies [Line Items]
Operating power plant capacity | MW					14.9
Hartford
Commitments And Contingencies [Line Items]
Operating power plant capacity | MW					7.4
Posco Energy
Commitments And Contingencies [Line Items]
Loss contingency, damages sought		$ 200,000	$ 3,300
Unspecified warranty claims			$7
License termination			$ 110,000
Bond amount					$ 46,000		$ 46,000

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