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Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2020 | Oct. 31, 2019
Schedule Of Accrued Liabilities [Line Items] |  |
Product warranty expense | $ 0.1 | $ 0.1
Loss reserve on service agreements | 5.5 | 3.3
Bridgeport Fuel Cell Project [Member] |  |
Schedule Of Accrued Liabilities [Line Items] |  |
Reserve for performance guarantees on service agreements and PPA's | $ 0.8 | $ 1.4

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- Definition loss reserve on service agreements + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reserve for performance guarantees on service and power purchase agreement. + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Schedule of accrued liabilities. + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3,4)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
Name: | us-gaap_ProductWarrantyExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |