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v3.7.0.1

Nature of Business and Basis of Presentation (Details) | 3 Months Ended
--- | ---
Jan. 31, 2017 | Jan. 31, 2016
POSCO Energy [Member] |  |
Common stock ownership percentage | 6.00% |
significant customer revenue percentage | 10.00% | 45.00%
NRG Energy, Inc. [Member] |  |
Common stock ownership percentage | 3.00% |
significant customer revenue percentage |  | 0.20%

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- Definition Common stock ownership percentage + References No definition available. + Details
Name: | fcel_CommonStockOwnershipPercentage
Namespace Prefix: | fcel_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percent of consolidated revenue by customer. + References No definition available. + Details
Name: | fcel_SignificantCustomerRevenuePercentage
Namespace Prefix: | fcel_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MajorCustomersAxis=fcel_PoscoEnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=fcel_NRGEnergyInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |