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Debt - Additional Information (Details) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 14, 2018 | Mar. 28, 2018 USD ($) | Jan. 31, 2018 | Oct. 31, 2018 USD ($) Employee | Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Apr. 01, 2020 USD ($) | Oct. 01, 2018 USD ($) | Nov. 30, 2016 USD ($) | Apr. 30, 2016 USD ($) | Nov. 30, 2015 USD ($) | Mar. 05, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  | $ 13,091,000 | $ 17,877,000 | $ 85,935,000 |  |  |  |  |  |
Lease payment term |  |  |  |  | 36 months |  |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 25,000,000 |  |  |  |  |  | $ 25,000,000 |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |
Term of loan |  |  |  |  | 30 months |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range | 10.65% | 10.40% | 10.15% |  | 9.90% |  |  |  |  |  |  |  |
Other Deductions and Charges |  |  |  |  | $ 1,700,000 |  |  |  | $ 1,700,000 |  |  |  |
Loan Advance |  |  | $ 13,100,000 |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  | $ 11,900,000 |  | $ 25,343,000 | $ 21,468,000 |  |  |  |  |  |  |
Term Loan Maturity Date |  |  |  |  | Apr. 01, 2020 |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  | 4.50% |  |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amendment description |  |  |  |  | As collateral for obligations under Hercules Agreement, the Company granted Hercules a security interest in FuelCell Energy, Inc.’s existing and thereafter-acquired assets except for intellectual property and certain other excluded assets. The collateral does not include assets held by FuelCell Energy Finance, LLC (“FuelCell Finance”) or any project subsidiary thereof. The Company may continue to collateralize and finance its project subsidiaries through other lenders and partners. Under the Hercules Agreement, as amended, there is a minimum cash covenant which requires the Company to maintain an unrestricted cash balance in accounts subject to an account control agreement in favor of Hercules of at least the greater of (a) 75% of the outstanding loan balance plus (b) the amount of accounts payable (as defined under GAAP) not paid within 90 days of the invoice date. The Hercules Agreement, as amended, contains customary representations and warranties, affirmative and negative covenants, and events of default that entitle Hercules to cause our indebtedness under the agreement to become immediately due and payable. |  |  |  |  |  |  |  |
Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable |  |  |  |  | 75.00% |  |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Deductions and Charges |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |
Hercules Capital, Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  |  |  | 9.75% |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
State of Connecticut [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan |  |  |  |  | 15 years |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Number of targeted connecticut employees | Employee |  |  |  |  | 703 |  |  |  |  |  |  |  |
Number of employees committed to hire | Employee |  |  |  |  | 100 |  |  |  |  |  |  |  |
Number of connecticut Employees | Employee |  |  |  |  | 452 |  |  |  |  |  |  |  |
Promossiory note payable for each employee under 703 employee target |  |  |  |  | $ 14,000 |  |  |  |  |  |  |  |
CT Department of Economic & Community Development [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |
PNC Energy Capital, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  | 46,900,000 | 46,100,000 |  |  |  |  |  |  |
Connecticut Green Bank Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,900,000
Long-term Line of Credit |  |  |  |  | 6,052,000 | 6,052,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Connecticut Development Authority Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  | $ 284,000 | 2,349,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.00% |  |  |  |  |  |  |  |
Collateralized Agreements |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |
Webster Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  |  | 5.00% |  |  |  |  |  |  |  |
Notes Payable to Bank, Current |  |  |  |  | $ 1,100,000 | 1,700,000 |  |  |  | $ 2,300,000 |  |  |
NRG Energy, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  | 0 | 0 |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |
NRG Energy, Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  |  | 8.00% |  |  |  |  |  |  |  |
Optional project financing term |  |  |  |  | 5 years |  |  |  |  |  |  |  |
NRG Energy, Inc. [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  |  | 8.50% |  |  |  |  |  |  |  |

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