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Project assets (Details) - USD ($) $ in Thousands | Jan. 31, 2017 | Oct. 31, 2016
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Project assets [Abstract] |  |
Project Assets without a sale-leaseback | $ 13,700 |
Long-term project assets | 50,530 | $ 47,111
Sale Leaseback Transaction, Net Book Value | $ 34,500 |

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- Definition Long-term project assets + References No definition available. + Details
Name: | fcel_Longtermprojectassets
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Project Assets without a sale-leaseback + References No definition available. + Details
Name: | fcel_ProjectAssetswithoutasaleleaseback
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Project assets [Abstract] + References No definition available. + Details
Name: | fcel_ProjectassetsAbstract
Namespace Prefix: | fcel_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 + Details
Name: | us-gaap_SaleLeasebackTransactionNetBookValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant