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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	4,300,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	5,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	4,300,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	5,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 3.35us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1		$ 3.35us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' equity (decifit), Including Portion Attributable to Noncontrolling Interest			$ 98,449us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Stock Granted During Period, Value, Share-based Compensation, Net of Forfeitures			1,507us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
Stock Issued During Period, Value, New Issues			16,660us-gaap_StockIssuedDuringPeriodValueNewIssues
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures			(329)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Dividends, Preferred Stock	(800)us-gaap_DividendsPreferredStock	(800)us-gaap_DividendsPreferredStock	(1,600)us-gaap_DividendsPreferredStock	(1,600)us-gaap_DividendsPreferredStock
Foreign currency translation adjustments	(52)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	130us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	(340)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	110us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Net Loss	(9,997)us-gaap_ProfitLoss	(16,039)us-gaap_ProfitLoss	(14,151)us-gaap_ProfitLoss	(26,854)us-gaap_ProfitLoss
Stockholders' equity (deficit), Including Portion Attributable to Noncontrolling Interest	100,196us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest		100,196us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Proceeds from Issuance of Common Stock			16,773us-gaap_ProceedsFromIssuanceOfCommonStock	36,854us-gaap_ProceedsFromIssuanceOfCommonStock
Class of Warrant or Right, Unissued	1,250,000us-gaap_ClassOfWarrantOrRightUnissued		1,250,000us-gaap_ClassOfWarrantOrRightUnissued
Class of Warrant or Right, Outstanding	2,250,000us-gaap_ClassOfWarrantOrRightOutstanding		2,250,000us-gaap_ClassOfWarrantOrRightOutstanding
Class of Warrant or Right, Weighted Average Strike Price of Warrants or Rights Outstanding	$ 1.98fcel_ClassofWarrantorRightWeightedAverageStrikePriceofWarrantsorRightsOutstanding		$ 1.98fcel_ClassofWarrantorRightWeightedAverageStrikePriceofWarrantsorRightsOutstanding
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' equity (decifit), Including Portion Attributable to Noncontrolling Interest			99,987us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Stock Granted During Period, Value, Share-based Compensation, Net of Forfeitures			1,507us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Stock Issued During Period, Value, New Issues			16,660us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures			(329)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Dividends, Preferred Stock			(1,600)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Foreign currency translation adjustments			(340)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Reclass of noncontrolling interest due to liquidation of subsidiary			(1,308)fcel_ReclassOfNoncontrollingInterestDueToLiquidationOfSubsidiary / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Net Loss			(13,960)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Stockholders' equity (deficit), Including Portion Attributable to Noncontrolling Interest	100,617us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember		100,617us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' equity (decifit), Including Portion Attributable to Noncontrolling Interest			(1,538)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Reclass of noncontrolling interest due to liquidation of subsidiary			1,308fcel_ReclassOfNoncontrollingInterestDueToLiquidationOfSubsidiary / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net Loss			(191)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Stockholders' equity (deficit), Including Portion Attributable to Noncontrolling Interest	(421)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember		(421)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Common Stock [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues			11,523,647us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from Issuance of Common Stock			$ 16,700us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
NRG Energy, Inc. [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	2,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_MajorCustomersAxis = fcel_NRGEnergyInc.Member		2,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_MajorCustomersAxis = fcel_NRGEnergyInc.Member
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Capital Shares Reserved for Future Issuance	5,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_MajorCustomersAxis = fcel_NRGEnergyInc.Member		5,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_MajorCustomersAxis = fcel_NRGEnergyInc.Member

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