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Debt - Additional Information (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
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Dec. 17, 2020 USD ($) | Dec. 07, 2020 USD ($) | Nov. 30, 2020 USD ($) | Nov. 22, 2019 USD ($) $ / shares shares | May 09, 2019 USD ($) MW | Jan. 31, 2019 USD ($) position | Oct. 31, 2015 USD ($) position | Jan. 31, 2020 shares | Oct. 31, 2022 USD ($) employee | Oct. 31, 2021 USD ($) | Oct. 31, 2020 USD ($) | Oct. 31, 2019 USD ($) $ / shares shares | Apr. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | May 16, 2019 | Feb. 06, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights exercised | shares |  |  |  |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ 6,394,000 | $ 7,363,000 | $ 15,294,000 |  |  |  |  |
Prepayment penalties |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |
Average number of employees | employee |  |  |  |  |  |  |  |  | 359 |  |  |  |  |  |  |
Consecutive term for average number of employees |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |  |  |
Amount of debt reclassified to current |  |  |  |  |  |  |  |  | $ 3,300,000 |  |  |  |  |  |  |
Repayment of interest included in debt |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Sale-leaseback Arrangements with PNC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase right percentage of projected assets at fair market value |  |  |  |  |  |  |  |  | 31.00% |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate principal amount on discount |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |
Class of warrants or rights issued value |  |  |  |  |  |  |  |  |  |  |  | $ 3,900,000 |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility | Senior Secured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  |  |  |  |  |  | 200,000,000.0 |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility | Initial Funding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  |  |  |  |  |  |  |  |  | 14,500,000 |  |  |  |
Long-term line of credit after discount |  |  |  |  |  |  |  |  |  |  |  | 14,100,000 |  |  |  |
Long-term line of credit, discount |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |
Exercise price of warrants or rights | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.310 |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility | Initial Funding | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Securities Called By Warrants | shares |  |  |  |  |  |  |  |  |  |  |  | 6,000,000.0 |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility | Second Funding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  | $ 65,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit after discount |  |  |  | 63,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit, discount |  |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility | Second Funding | Exercise Price 0.242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants or rights | $ / shares |  |  |  | $ 0.242 |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights exercised | shares |  |  |  | 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility | Second Funding | Exercise Price 0.620 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants or rights | $ / shares |  |  |  | $ 0.620 |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights exercised | shares |  |  |  | 6,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility | Second Funding | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights issued | shares |  |  |  | 14,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Connecticut Green Bank Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 |  | $ 3,000,000.0 |  |
Debt instrument, interest rate, stated percentage rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |
Long-term line of credit |  |  |  |  |  |  |  |  | $ 4,800,000 |  |  |  |  |  |  |
Connecticut Green Bank Notes | Groton Commitment Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated project term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0
Subordinated Credit Agreement | Bridgeport Fuel Cell, LLC | Connecticut Green Bank Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  | 14.9 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage rate |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  |  |  | $ 6,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant terms |  |  |  |  |  |  |  |  | On May 9, 2019, in connection with the closing of the purchase of the membership interests of Bridgeport Fuel Cell, LLC (“BFC”) (and the 14.9 MW Bridgeport Fuel Cell Project), BFC (a subsidiary of the Company following the closing) entered into a subordinated credit agreement with the Connecticut Green Bank whereby Connecticut Green Bank provided financing in the amount of $6.0 million (the “Subordinated Credit Agreement”). This $6.0 million consisted of $1.8 million in incremental funding that was received by BFC and $4.2 million of funding previously received by FuelCell Energy, Inc. with respect to which BFC became the primary obligor. As security for the Subordinated Credit Agreement, Connecticut Green Bank received a perfected lien, subordinated and second in priority to the liens securing the $25.0 million loaned under the BFC Credit Agreement (as defined below), in all of the same collateral securing the BFC Credit Agreement. The interest rate under the Subordinated Credit Agreement is 8% per annum. Principal and interest are due monthly in amounts sufficient to fully amortize the loan over an 84-month period ending in May 2026. The Subordinated Credit Agreement contains a debt coverage ratio which is required to be maintained and may not be less than 1.10 as of the end of each fiscal quarter, beginning with the quarter ended July 31, 2020. The balance under the Subordinated Credit Agreement as of October 31, 2022 was $3.5 million. |  |  |  |  |  |  |
Subordinated Credit Agreement | Minimum | Bridgeport Fuel Cell, LLC | Connecticut Green Bank Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  | 1.10% |  |  |  |  |  |  |  |  |  |  |
Subordinated Credit Agreement | Incremental Funding. | Bridgeport Fuel Cell, LLC | Connecticut Green Bank Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |
Subordinated Credit Agreement | Previously Received | Bridgeport Fuel Cell, LLC | Connecticut Green Bank Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  |  |  | 4,200,000 |  |  |  |  |  |  |  |  |  |  |
Subordinated Credit Agreement | Senior Term Loan | Bridgeport Fuel Cell, LLC | Connecticut Green Bank Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liens securing senior term loan amount |  |  |  |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | Bridgeport Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | May 09, 2025 |  |  |  |  |  |  |  |  |  |  |
Interest rate description |  |  |  |  |  |  |  |  | The interest rate under the BFC Credit Agreement fluctuates monthly at the 30-day LIBOR rate plus 275 basis points. |  |  |  |  |  |  |
Debt instrument, interest rate basis term |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | Bridgeport Loans | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.09% |
Credit Agreement | Bridgeport Loans | Fair Value, Inputs, Level 2 | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value adjustments, charge |  |  |  |  |  |  |  |  | $ (800,000) | 500,000 | (300,000) |  |  |  |  |
Fair value asset interest rate |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |
Fair value liability interest rate |  |  |  |  |  |  |  |  |  | (500,000) |  |  |  |  |  |
Credit Agreement | Bridgeport Loans | Fifth Third Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operation and module replacement reserve to be deposited per month |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Credit Agreement | Bridgeport Fuel Cell, LLC | Bridgeport Loans | Fifth Third Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  |  |  | $ 12,500,000 |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | Bridgeport Fuel Cell, LLC | Bridgeport Loans | Liberty Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  |  |  | $ 12,500,000 |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | Minimum | Bridgeport Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  |  |  |  |  | 1.20% |  |  |  |  |  |  |
Finance Obligations for Sale Leaseback Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future payments included in financing obligation for the remaining lease |  |  |  |  |  |  |  |  | $ 38,600,000 |  |  |  |  |  |  |
Finance Obligations for Sale Leaseback Agreements | PNC Energy Capital, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  |  |  | 56,600,000 |  | $ 56,500,000 |  |  |  |  |
State of Connecticut Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage rate |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  |  |  | $ 7,774,000 | $ 8,622,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  | $ 10,000,000.0 |  |  |
Debt instrument, payment terms, period principal payments are deferred |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |
Debt instrument, date of first required payment |  |  |  |  |  |  | Dec. 01, 2019 |  |  |  |  |  |  |  |  |
Loans Forgiveness Terms |  |  |  |  |  |  |  |  | if the Company created 165 full-time positions and retained 538 full-time positions for two consecutive years (the “Employment Obligation”) as measured on October 28, 2017 (the “Target Date”). The Assistance Agreement was subsequently amended in April 2017 to extend the Target Date by two years to October 28, 2019. |  |  |  |  |  |  |
Debt instrument period for deferment of principal and interest payments |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |
State of Connecticut Loan | Employment Obligation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of full time positions required to be created | position |  |  |  |  |  |  | 165 |  |  |  |  |  |  |  |  |
Number of full time positions required to be retained | position |  |  |  |  |  |  | 538 |  |  |  |  |  |  |  |  |
State of Connecticut Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of loan forgiveness |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |
State of Connecticut Loan | Second Amendment | Employment Obligation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of minimum full time positions required to be maintained | position |  |  |  |  |  | 538 |  |  |  |  |  |  |  |  |  |
Number of consecutive months maintain full time positions |  |  |  |  |  | 24 months |  |  |  |  |  |  |  |  |  |
Additional number of full time positions required to be create | position |  |  |  |  |  | 91 |  |  |  |  |  |  |  |  |  |
Additional credits to be earned |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |
Target date of job audit |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |  |
Principal payable number of employee under employee obligation target |  |  |  |  |  | $ 18,587.36 |  |  |  |  |  |  |  |  |  |
PNC Energy Capital, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Bridgeport Fuel Cell, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |  |  |
Payoff Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit after discount |  | $ 87,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument prepayment premium | $ 4,000,000.0 |  | $ 14,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining deferred finance expense | 7,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of lines of credit | 11,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payoff Letter | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt prepayment premium amount to be waived |  | $ 4,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment Premium And WriteOff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt prepayment premium expense amount | $ 4,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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