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Project assets (Details) - USD ($) $ in Thousands | Jul. 31, 2016 | Oct. 31, 2015
--- | --- | ---
Project assets [Abstract] |  |
Project Assets, Current | $ 15,632 | $ 5,260
Long-term project assets | 18,370 | 6,922
project assets current and noncurrent | $ 34,002 | $ 12,182

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- Definition Long-term project assets + References No definition available. + Details
Name: | fcel_Longtermprojectassets
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Project Assets, Current + References No definition available. + Details
Name: | fcel_ProjectAssetsCurrent
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Project assets [Abstract] + References No definition available. + Details
Name: | fcel_ProjectassetsAbstract
Namespace Prefix: | fcel_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition project assets current and noncurrent + References No definition available. + Details
Name: | fcel_Projectassetscurrentandnoncurrent
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant