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Nature of Business and Basis of Presentation (Details)	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
POSCO Energy [Member]
Common stock ownership percentage	6.00%
significant customer revenue percentage	10.00%	45.00%
NRG Energy, Inc. [Member]
Common stock ownership percentage	3.00%
significant customer revenue percentage		0.20%

X

- Definition

Common stock ownership percentage

+ References

No definition available.

+ Details

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

X

- Definition

Percent of consolidated revenue by customer.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_MajorCustomersAxis=fcel_PoscoEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorCustomersAxis=fcel_NRGEnergyInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: