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Income Taxes (Details) (USD $)
 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Operating Loss Carryforwards [Line Items]      
Unrecognized Tax Benefits $ 15,700,000us-gaap_UnrecognizedTaxBenefits $ 15,700,000us-gaap_UnrecognizedTaxBenefits  
Income (Loss) from Continuing Operations before Income Taxes, Domestic (35,167,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic (31,044,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic (35,535,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Income (Loss) from Continuing Operations before Income Taxes, Foreign (3,228,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (3,904,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (302,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest (38,395,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (34,948,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (35,837,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current Foreign Tax Expense (Benefit) 500,000us-gaap_CurrentForeignTaxExpenseBenefit 400,000us-gaap_CurrentForeignTaxExpenseBenefit 70,000us-gaap_CurrentForeignTaxExpenseBenefit
franchise tax expense 200,000fcel_FranchiseTaxExpense 200,000fcel_FranchiseTaxExpense 200,000fcel_FranchiseTaxExpense
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, State and Local Income Taxes (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (2.60%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
effective income tax rate reconciliation, net operating loss adjustment (25.40%)fcel_EffectiveIncomeTaxRateReconciliationNetOperatingLossAdjustment 0.10%fcel_EffectiveIncomeTaxRateReconciliationNetOperatingLossAdjustment (34.90%)fcel_EffectiveIncomeTaxRateReconciliationNetOperatingLossAdjustment
Effective Income Tax Rate Reconciliation, Nondeductible Expense 14.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 10.50%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate (6.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Effective Income Tax Rate Reconciliation, Other Adjustments 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 4.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance 47.10%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 20.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 77.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Income Tax Rate, Continuing Operations 1.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 1.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits 7,591,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 6,452,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts 1,859,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 1,841,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts  
Deferred Tax Assets, Capital Loss Carryforwards 13,486,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 13,582,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards  
Deferred Tax Assets, Operating Loss Carryforwards 247,170,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 228,154,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
deferred tax assets, deferred license revenue 8,894,000fcel_DeferredTaxAssetsDeferredLicenseRevenue 8,033,000fcel_DeferredTaxAssetsDeferredLicenseRevenue  
Deferred Tax Assets, Inventory 521,000us-gaap_DeferredTaxAssetsInventory 509,000us-gaap_DeferredTaxAssetsInventory  
Deferred Tax Assets, Investments 404,000us-gaap_DeferredTaxAssetsInvestments 419,000us-gaap_DeferredTaxAssetsInvestments  
Deferred Tax Assets, Property, Plant and Equipment 590,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 625,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Deferred Tax Assets, Gross 280,515,000us-gaap_DeferredTaxAssetsGross 259,615,000us-gaap_DeferredTaxAssetsGross  
Deferred Tax Assets, Valuation Allowance (280,515,000)us-gaap_DeferredTaxAssetsValuationAllowance (259,615,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Deferred Tax Assets, Net of Valuation Allowance 0us-gaap_DeferredTaxAssetsNet 0us-gaap_DeferredTaxAssetsNet  
Deferred Tax Liabilities, Deferred Expense, Capitalized Research and Development Costs (3,377,000)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedResearchAndDevelopmentCosts (3,377,000)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedResearchAndDevelopmentCosts  
Deferred Tax Liabilities, Net (3,377,000)us-gaap_DeferredTaxLiabilities (3,377,000)us-gaap_DeferredTaxLiabilities  
Valuation Allowance Allocated To Reduce Additional Paid In Capital 4,300,000fcel_ValuationAllowanceAllocatedToReduceAdditionalPaidInCapital    
Federal Operating Loss Carryforwards 655,000,000fcel_FederalOperatingLossCarryforwards    
State Operating Loss Carryforwards 396,000,000fcel_StateOperatingLossCarryforwards    
Tax Credits, State 10,400,000fcel_TaxCreditsState    
Amount of Tax Credits to Expire $ 1,000,000fcel_AmountOfTaxCreditsToExpire