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v2.4.1.9

Nature of Business and Basis of Presentation (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014
POSCO Energy [Member] |  |  |  |
Common stock ownership percentage | 10.00%fcel_CommonStockOwnershipPercentage / us-gaap_MajorCustomersAxis = fcel_PoscoEnergyMember |  | 10.00%fcel_CommonStockOwnershipPercentage / us-gaap_MajorCustomersAxis = fcel_PoscoEnergyMember |
significant customer revenue percentage | 66.00%fcel_SignificantCustomerRevenuePercentage / us-gaap_MajorCustomersAxis = fcel_PoscoEnergyMember | 78.00%fcel_SignificantCustomerRevenuePercentage / us-gaap_MajorCustomersAxis = fcel_PoscoEnergyMember | 59.00%fcel_SignificantCustomerRevenuePercentage / us-gaap_MajorCustomersAxis = fcel_PoscoEnergyMember | 75.00%fcel_SignificantCustomerRevenuePercentage / us-gaap_MajorCustomersAxis = fcel_PoscoEnergyMember
NRG Energy [Member] |  |  |  |
Common stock ownership percentage | 6.00%fcel_CommonStockOwnershipPercentage / us-gaap_MajorCustomersAxis = fcel_NRGEnergyMember |  | 6.00%fcel_CommonStockOwnershipPercentage / us-gaap_MajorCustomersAxis = fcel_NRGEnergyMember |
significant customer revenue percentage | 1.00%fcel_SignificantCustomerRevenuePercentage / us-gaap_MajorCustomersAxis = fcel_NRGEnergyMember | 0.00%fcel_SignificantCustomerRevenuePercentage / us-gaap_MajorCustomersAxis = fcel_NRGEnergyMember |  | 3.00%fcel_SignificantCustomerRevenuePercentage / us-gaap_MajorCustomersAxis = fcel_NRGEnergyMember

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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_NRGEnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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