XML 44 R33.htm IDEA: XBRL DOCUMENT v3.5.0.2

Nature of Business and Basis of Presentation (Details)	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Common stock ownership percentage	4.99%		4.99%
POSCO Energy [Member]
Common stock ownership percentage	8.00%		8.00%
significant customer revenue percentage	65.00%	75.00%	52.00%	65.00%
NRG Energy [Member]
Common stock ownership percentage	4.00%		4.00%
significant customer revenue percentage	0.30%	0.40%	0.20%	2.20%

X

- Definition

Common stock ownership percentage

+ References

No definition available.

+ Details

Name:	fcel_CommonStockOwnershipPercentage
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_NRGEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: