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Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Schedule Of Accrued Liabilities [Line Items]
Product warranty accrual, warranties issued	$ 0.1	$ 0.4
Product warranty accrual, payment and adjustments	0.1	0.6
Loss reserve on service agreements	3.3	0.9
Bridgeport Fuel Cell Project [Member]
Schedule Of Accrued Liabilities [Line Items]
Reserve for performance guarantees on service agreements and PPA's	$ 0.8	$ 1.1

X

- Definition

loss reserve on service agreements

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Reserve for performance guarantees on service and power purchase agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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://fasb.org/us-gaap/role/ref/legacyRef
-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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Balance Type:	debit
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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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