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Debt and Leases Debt (Details) (USD $)
12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Jun. 25, 2013
Mar. 05, 2013
Debt Instrument [Line Items]          
Payments of Debt Issuance Costs $ 0us-gaap_PaymentsOfDebtIssuanceCosts $ 2,472,000us-gaap_PaymentsOfDebtIssuanceCosts $ 0us-gaap_PaymentsOfDebtIssuanceCosts    
Embedded Derivative, Fair Value of Embedded Derivative Liability   4,700,000us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability      
Convertible Debt 0us-gaap_ConvertibleDebt 38,000,000us-gaap_ConvertibleDebt   38,000,000us-gaap_ConvertibleDebt  
Line of Credit Facility, Maximum Borrowing Capacity 4,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity        
Line of Credit Facility, Amount Outstanding 945,000us-gaap_LineOfCredit 6,500,000us-gaap_LineOfCredit      
Long-term Debt, Current Maturities 1,439,000us-gaap_LongTermDebtCurrent 6,931,000us-gaap_LongTermDebtCurrent      
Long-term Debt, Excluding Current Maturities 9,312,000us-gaap_LongTermDebtNoncurrent 43,950,000us-gaap_LongTermDebtNoncurrent      
Interest Paid 1,892,000us-gaap_InterestPaid 280,000us-gaap_InterestPaid 302,000us-gaap_InterestPaid    
Lease Payment Terms 36 months        
Convertible Debt [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_ConvertibleDebtMember
 
Connecticut Development Authority Note [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Amount Outstanding 3,033,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
3,246,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
     
Debt Instrument, Face Amount 4,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
       
Debt Instrument, Interest Rate, Stated Percentage 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
       
Collateralized Agreements 4,000,000us-gaap_CollateralizedAgreements
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
       
Connecticut Clean Energy Fund [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity         5,900,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutCleanEnergyFundMember
Connecticut Clean Energy and Finance Investment Authority [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Amount Outstanding $ 6,052,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutCleanEnergyAndFinanceInvestmentAuthorityMember
$ 5,744,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutCleanEnergyAndFinanceInvestmentAuthorityMember
     
Debt Instrument, Interest Rate, Stated Percentage 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutCleanEnergyAndFinanceInvestmentAuthorityMember