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Accrued Liabilities - Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions | Jul. 31, 2023 | Oct. 31, 2022
--- | --- | ---
Schedule Of Accrued Liabilities [Line Items] |  |
Loss reserve on service agreements | $ 7.2 | $ 7.3
Bridgeport Fuel Cell Project |  |
Schedule Of Accrued Liabilities [Line Items] |  |
Reserve for performance guarantees | $ 5.8 | $ 4.1

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- Definition loss reserve on service agreements + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition reserve for performance guarantees + 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
Period Type: | duration

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