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Benefit Plans Employee Tax-Deferred Savings Plan (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
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 $ 0.3us-gaap_DefinedContributionPlanCostRecognized $ 0.3us-gaap_DefinedContributionPlanCostRecognized