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Debt - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015 | Nov. 30, 2016 | Nov. 09, 2015 | Mar. 05, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Debt | $ 17,877,000 | $ 85,935,000 | $ 6,763,000 |  |  |
Lease payment term | 36 months |  |  |  |  |
Hercules Capital, Inc. [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Debt |  | 20,000,000 |  |  |  |
Term of loan | 30 months |  |  |  |  |
Other Deductions and Payment | $ 1,700,000 |  |  |  |  |
Long-term Line of Credit | $ 21,468,000 | 20,521,000 |  |  |  |
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 hereafter-acquired assets except for intellectual property and certain other excluded assets. Collateral does not include assets held by 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 (x) (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 and (y) (a) at all times prior to the Stockholder Approval Date (as defined in the Certificate of Designations for the Series C Preferred Stock), $20.0 million and (b) at all times on and after the Stockholder Approval Date, $10.0 million (the Stockholder Approval Date was December 14, 2017, which was the date on which stockholder approval of the issuance of certain shares upon the conversion and/or redemption of the Company’s Series C Preferred Stock was obtained). |  |  |  |  |
Hercules Capital, Inc. [Member] | Series C Preferred Stock [Member] | Prior to Stockholder Approval Date [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Minimum required unrestricted cash balance under control agreement | $ 20,000,000 |  |  |  |  |
Hercules Capital, Inc. [Member] | Series C Preferred Stock [Member] | On and After Stockholder Approval Date [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Minimum required unrestricted cash balance under control agreement | $ 10,000,000 |  |  |  |  |
Hercules Capital, Inc. [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range | 9.50% |  |  |  |  |
Hercules Capital, Inc. [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range | 9.75% |  |  |  |  |
CT Department of Economic & Community Development [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 10,000,000 | 10,000,000 |  |  | $ 10,000,000 |
State of Connecticut [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term of loan | 15 years |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 10,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 2.00% |  |  |  |  |
PNC Energy Capital, LLC [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Line of Credit | $ 46,900,000 | 41,600,000 |  |  |  |
Sale leaseback transaction, amount due under financing arrangement | 5,400,000 | 41,500,000 |  |  |  |
NRG Energy, Inc. [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 40,000,000 |  |  |  |  |
NRG Energy, Inc. [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range | 8.00% |  |  |  |  |
NRG Energy, Inc. [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range | 8.50% |  |  |  |  |
Connecticut Green Bank Note [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 5,900,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.00%
Long-term Line of Credit | $ 6,052,000 | 6,050,000 |  |  |  |
Connecticut Development Authority Note [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 4,000,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |  |  |  |  |
Long-term Line of Credit | $ 2,349,000 | $ 2,589,000 |  |  |  |
Collateralized Agreements | $ 4,000,000 |  |  |  |  |
New Britain Renewable Energy Member [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range | 5.00% |  |  |  |  |
Long-term Line of Credit | $ 1,697,000 |  |  |  |  |
Notes Payable to Bank, Current | $ 1,700,000 |  |  | $ 2,300,000 |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Current portion of the total carrying amount as of the balance sheet date due within one year or the operating cycle, if longer, on all notes payable to banks paid on an installment with long term maturities. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(1),20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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