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Benefit Plans Employee Tax-Deferred Savings Plan (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Employer Matching Contribution Percentage | 2.00%fcel_EmployerMatchingContributionPercentage |  | 1.00%fcel_EmployerMatchingContributionPercentage
Defined Contribution Plan, Cost Recognized | $ 0.3 us-gaap_DefinedContributionPlanCostRecognized | $ 0.3 us-gaap_DefinedContributionPlanCostRecognized |

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- Definition Employer Matching Contribution Percentage + References No definition available. + Details
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Namespace Prefix: | fcel_
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Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration