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Nature of Business and Basis of Presentation - Additional Information (Details)	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
POSCO Energy [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Common stock ownership percentage	3.00%
Significant customer revenue percentage	4.00%	10.00%
NRG Energy, Inc. [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Common stock ownership percentage	2.00%
Significant customer revenue percentage	0.00%	0.40%

X

- Definition

Common stock ownership percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcel_
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X

- Definition

Nature of business and basis of presentation.

+ References

No definition available.

+ Details

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X

- Definition

Percent of consolidated revenue by customer.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fcel_NRGEnergyMember
Namespace Prefix:
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Period Type: