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Other Assets - Schedule of Other Assets (Parenthetical) (Details) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jun. 29, 2016 Customer
Other Assets Noncurrent [Abstract] |  |  |
Deferred finance costs amortization period | 5 years |  |
Number of customers under agreement | Customer |  |  | 1
Contractual Obligation | $ | $ 2.0 | $ 1.6 |

X
- Definition Deferred finance costs amortization period. + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of customers under agreement. + References No definition available. + Details
Name: | fcel_NumberOfCustomersUnderAgreement
Namespace Prefix: | fcel_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration