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Benefit Plans Employee Tax-Deferred Savings Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employer Matching Contribution Percentage	2.00%
Defined Contribution Plan, Cost Recognized	$ 0.4	$ 0.3	$ 0.3

X

- Definition

Employer Matching Contribution Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	fcel_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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=49170846&loc=d3e28014-114942

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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