Commitments and Contingencies - Additional Information (Details) $ in Thousands				1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 14, 2020 USD ($) item	Jun. 28, 2020 USD ($)	Apr. 27, 2020 USD ($)	Oct. 31, 2020 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2022 USD ($)	Jul. 31, 2022 USD ($) project MW	Oct. 31, 2021 USD ($)	Dec. 20, 2021 USD ($)
Commitments And Contingencies [Line Items]
Recorded unconditional purchase obligation							$ 75,600
Loss contingency, damages sought				$ 880,000
Total number of projects | project							3
Impairment charges							$ 14,000	$ 2,800
Long Term Project Assets							$ 246,018	$ 223,277
POSCO Energy Settlement Agreement
Commitments And Contingencies [Line Items]
Unspecified warranty claims	$ 1,000
Accounts receivable outstanding					$ 11,200	$ 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							$ 21,300
Derby Project 14.0 Mega Watt
Commitments And Contingencies [Line Items]
Under construction power plant capacity | MW							14.0
Long Term Project Assets							$ 26,200
Derby Project 2.8 Mega Watt
Commitments And Contingencies [Line Items]
Under construction power plant capacity | MW							2.8
Long Term Project Assets							$ 600
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			7,000
License termination			$ 110,000
Bond amount							$ 46,000