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Project Assets - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2021 USD ($) ProjectAsset | Jan. 31, 2020 USD ($) | Oct. 31, 2020 USD ($) ProjectAsset
Project Assets [Abstract] |  |  |
Number of project assets | ProjectAsset | 8 |  | 8
Sale leaseback transaction, net book value | $ 70.6 |  | $ 70.5
Project asset depreciation | 4.0 | $ 3.0 |
Long-term project assets construction in progress | 94.0 |  | 91.3
PPA assets construction in progress | $ 4.9 |  | $ 4.8

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- Definition Depreciation expense on project assets. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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

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- Definition Number of project assets. + References No definition available. + Details
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- Definition PPA Assets Construction In Progress. + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Project assets. + References No definition available. + Details
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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=121602674&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=121606570&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=121602674&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=121602674&loc=d3e51831-112757 + Details
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