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Benefit Plans 5 (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2012
Employee Stock Purchase Plan Disclosures [Line Items] |  |  |
Restricted Stock Awards, Weighted Average Remaining Life | 2 years 6 months |  |
Stock Issued During Period, Shares, Other |  | 550,355 us-gaap_StockIssuedDuringPeriodSharesOther |
Common stock issued to settle make-whole obligation, value |  | $ 600 us-gaap_StockIssuedDuringPeriodValueOther |
Common Stock, Capital Shares Reserved for Future Issuance | 18,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |
Weighted Average Expented Life Assumption for Employee Stock Purchase Plan | 0 years 6 months | 0 years 6 months | 0 years 6 months
Weighted Average Risk Free Interest Rate for Employee Stock Purchase Plan | 0.08%fcel_WeightedAverageRiskFreeInterestRateForEmployeeStockPurchasePlan | 0.15%fcel_WeightedAverageRiskFreeInterestRateForEmployeeStockPurchasePlan | 0.07%fcel_WeightedAverageRiskFreeInterestRateForEmployeeStockPurchasePlan
Volatility for Employee Stock Purchase Plan | 75.00%fcel_VolatilityForEmployeeStockPurchasePlan | 75.00%fcel_VolatilityForEmployeeStockPurchasePlan | 92.00%fcel_VolatilityForEmployeeStockPurchasePlan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 1.00 fcel_EmployeeStockPurchasePlanWeightedAverageFairValueOfSharesIssued |  |
Weighted Average Dividend Yield for Employee Stock Purchase Plan | 0.00%fcel_WeightedAverageDividendYieldForEmployeeStockPurchasePlan | 0.00%fcel_WeightedAverageDividendYieldForEmployeeStockPurchasePlan | 0.00%fcel_WeightedAverageDividendYieldForEmployeeStockPurchasePlan
Employee Stock Purchase Plan [Member] |  |  |
Employee Stock Purchase Plan Disclosures [Line Items] |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 282,209 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = fcel_EmployeeStockPurchasePlanMember | 549,584 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = fcel_EmployeeStockPurchasePlanMember |
Stock Issuance Terms | 85.00%fcel_StockIssuanceTerms / us-gaap_PlanNameAxis = fcel_EmployeeStockPurchasePlanMember |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 0.85 fcel_EmployeeStockPurchasePlanWeightedAverageFairValueOfSharesIssued / us-gaap_PlanNameAxis = fcel_EmployeeStockPurchasePlanMember |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | (124,334)us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_PlanNameAxis = fcel_EmployeeStockPurchasePlanMember |  |
Employee Stock Purchase Plan [Member] [Member] |  |  |
Employee Stock Purchase Plan Disclosures [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 1.13 fcel_EmployeeStockPurchasePlanWeightedAverageFairValueOfSharesIssued / us-gaap_PlanNameAxis = fcel_EmployeeStockPurchasePlanMemberMember |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | (143,041)us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_PlanNameAxis = fcel_EmployeeStockPurchasePlanMemberMember |  |

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