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Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2018	Oct. 31, 2017
Schedule Of Accrued Liabilities [Line Items]
Product warranty accrual, warranties issued	$ 0.3
Product warranty accrual, payment and adjustments	0.2
Gain reserve on service agreements	1.1	$ 1.1
Reserve for performance guarantees	2.6	$ 2.2
POSCO Energy [Member]
Schedule Of Accrued Liabilities [Line Items]
Additional billed and collected contractual milestone liabilities for inventory	$ 3.9

X

- Definition

Additional billed and collected contractual milestone liabilities for inventory.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Gain reserve on service agreements.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcel_
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Balance Type:	debit
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X

- Definition

reserve for performance guarantees

+ References

No definition available.

+ Details

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Namespace Prefix:	fcel_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Schedule of accrued liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcel_
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X

- Definition

Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(2))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of increase in the standard and extended product warranty accrual from warranties issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(3))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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