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Other Assets - Schedule of Other Assets (Parenthetical) (Details) $ in Millions | 6 Months Ended
--- | ---
Apr. 30, 2017 USD ($)
Other Assets Noncurrent [Abstract] |
Deferred finance costs amortization period | 5 years
Contractual Obligation | $ 1.4

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- 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 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
Name: | us-gaap_OtherAssetsNoncurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration