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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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