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Tax Equity Financings and Investment Tax Credit Sale (Details) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Oct. 31, 2023 USD ($) | Dec. 16, 2022 USD ($) MW | Dec. 15, 2022 MW | Oct. 04, 2022 MW | Jul. 07, 2022 USD ($) | May 15, 2022 USD ($) | Dec. 13, 2021 USD ($) | Oct. 18, 2021 | Aug. 04, 2021 USD ($) | Nov. 30, 2021 USD ($) MW | Aug. 31, 2021 USD ($) MW | Oct. 31, 2023 USD ($) Plant MW | Apr. 30, 2022 USD ($) | Oct. 31, 2023 USD ($) Plant MW | Oct. 31, 2022 USD ($) | Oct. 31, 2021 USD ($) | Jan. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (488,000) | $ (4,510,000) | $ 30,000 |  |
Accrued performance obligation | $ 3,958,000 |  |  |  |  |  |  |  |  |  |  | $ 3,958,000 |  | 3,958,000 |  |  |  |
Groton Project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  | 6.0 | 7.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of amendment fee |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2,500,000) | 0 |  |  |
Percentage of cash and tax allocations to be received |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |
East West Bank Partnership Flip Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  |  | 7.4 |  |  |  |  |  |  |
Tax equity financing commitment |  |  |  |  | $ 12,000,000.0 |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |
Tax equity financing, Aggregate fee |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Tax equity financing, Withdrawal right, Percent of return of investment |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |
Initial draw |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  |  |  |  |  |  |
Closing costs |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |
Remaining amount of draw |  |  |  |  |  |  |  |  | $ 12,000,000 |  |  |  |  |  |  |  |  |
Fee for extension of commercial operation deadline |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (30,000) |  |
Percentage reflecting conditional withdrawal for loss attributable to non controlling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |
East West Bank Partnership Flip Transaction | Groton Project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax equity financing, Aggregate fee |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REI Partnership Flip Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  | 7.4 |  |  |  |  |  |  |  |
Tax equity financing commitment |  |  |  |  |  |  |  |  |  | $ 12,400,000 |  |  | $ 11,900,000 |  |  |  |  |
Amount of Refund |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |
Amount of distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |
Percentage of annual interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.73% |  |  |
Initial draw |  |  |  |  |  |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |
Closing costs |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |
Remaining amount of draw |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,200,000 | $ 9,200,000
Legal and advisory fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |
Net (loss) income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 | $ (4,500,000) |  |  |
Percentage of cash and tax allocations to be received |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |
Percentage of amount payable |  |  |  |  |  |  |  |  |  | 10.30% |  |  |  |  |  |  |  |
Tax equity financing transactions with Franklin Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Fuel Cell Power Plants, Tax Equity Financing Transaction | Plant |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |
Tax equity financing commitment | 30,200,000 |  |  |  |  |  |  |  |  |  |  | $ 30,200,000 |  | $ 30,200,000 |  |  |  |
Tax equity financing transaction, commitment amount received | 9,100,000 |  |  |  |  |  |  |  |  |  |  |  |  | 9,100,000 |  |  |  |
Closing costs |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  | 1,800,000 |  |  |  |
Tax equity financing transactions with Franklin Park | Derby Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated additional fees |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |
Additional funding |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,600,000 |  |  |  |
Remaining amount of draw | 20,600,000 |  |  |  |  |  |  |  |  |  |  | $ 20,600,000 |  | $ 20,600,000 |  |  |  |
Percentage of cash and tax allocations to be received |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |
Tax equity financing transactions with Franklin Park | Derby Project 14.0 Mega Watt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  |  |  | 14.0 |  | 14.0 |  |  |  |
Tax equity financing transactions with Franklin Park | Derby Project 2.8 Mega Watt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  |  |  | 2.8 |  | 2.8 |  |  |  |
Toyota Investment Tax Credit Sale | REI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project's qualified ITCs | 8,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase amount of ITCs | 7,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eligible capital expenditure ITC rate per $1 purchased ITCs | 0.85 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued performance obligation | $ 6,300,000 |  |  |  |  |  |  |  |  |  |  | $ 6,300,000 |  | $ 6,300,000 |  |  |  |
First Anniversary of Project Achieving Commercial Operations [Member] | East West Bank Partnership Flip Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax equity financing commitment, Contributions |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Second Anniversary of Project Achieving Commercial Operations [Member] | East West Bank Partnership Flip Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax equity financing commitment, Contributions |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Third Anniversary of Project Achieving Commercial Operations [Member] | East West Bank Partnership Flip Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax equity financing commitment, Contributions |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | East West Bank Partnership Flip Transaction | Groton Project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Equity Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  | 7.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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