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Accounts Receivable (Details) (USD $) | Apr. 30, 2015 | Oct. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Government Contract Receivable | $ 3,411,000 us-gaap_GovernmentContractReceivable |  | $ 2,517,000 us-gaap_GovernmentContractReceivable |
Government Contract Receivable, Unbilled Amounts | 3,389,000 us-gaap_GovernmentContractReceivableUnbilledAmounts |  | 2,886,000 us-gaap_GovernmentContractReceivableUnbilledAmounts |
U.S. Government accounts receivable total | 6,800,000 fcel_UsGovernmentAccountsReceivableTotal | [1] | 5,403,000 fcel_UsGovernmentAccountsReceivableTotal | [1]
Contract Receivable | 7,814,000 us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms |  | 8,871,000 us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms |
Unbilled Contracts Receivable | 28,907,000 us-gaap_UnbilledContractsReceivable |  | 50,101,000 us-gaap_UnbilledContractsReceivable |
Commercial Customers accounts receivable | 36,721,000 fcel_CommercialCustomersAccountsReceivable |  | 58,972,000 fcel_CommercialCustomersAccountsReceivable |
Accounts Receivable, Net, Current | 43,521,000 us-gaap_AccountsReceivableNetCurrent |  | 64,375,000 us-gaap_AccountsReceivableNetCurrent |
Allowance for Doubtful Accounts Receivable, Current | 132,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  | 132,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |
POSCO Energy [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts Receivable, Related Parties, Current | 12,300,000 us-gaap_AccountsReceivableRelatedPartiesCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcel_PoscoEnergyMember |  | 29,900,000 us-gaap_AccountsReceivableRelatedPartiesCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcel_PoscoEnergyMember |
NRG Energy, Inc. [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts Receivable, Related Parties, Current | 100,000 us-gaap_AccountsReceivableRelatedPartiesCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcel_NRGEnergyInc.Member |  | 0 us-gaap_AccountsReceivableRelatedPartiesCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcel_NRGEnergyInc.Member |
Government [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Government Contract Receivable | $ 3,400,000 us-gaap_GovernmentContractReceivable / us-gaap_MajorCustomersAxis = us-gaap_GovernmentMember |  | $ 1,700,000 us-gaap_GovernmentContractReceivable / us-gaap_MajorCustomersAxis = us-gaap_GovernmentMember |
[1] | Total U.S. Government accounts receivable outstanding as of April 30, 2015 and October 31, 2014 was $3.4 million and $1.7 million, respectively.

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