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Project Assets - Additional Information (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 USD ($) ProjectAsset | Oct. 31, 2018 USD ($) ProjectAsset
Project Assets [Abstract] |  |
Long-term project assets | $ 123,136 | $ 99,600
Number of project assets | ProjectAsset | 5 | 5
Sale leaseback transaction, net book value | $ 26,100 | $ 28,600
Long-term project assets construction in progress | $ 97,000 | $ 71,000

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- Definition Long-term project assets. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Long term project assets construction in progress. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Number of project assets. + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Project assets. + References No definition available. + Details
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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 40 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77888430&loc=SL77919786-209982 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51843-112757 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51831-112757 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant