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Accrued Liabilities - Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions | Oct. 31, 2023 | Oct. 31, 2022
--- | --- | ---
Accrued Liabilities |  |
loss accruals on service contracts | $ 9.5 | $ 7.3
accruals for performance guarantees | $ 1.2 | $ 4.1

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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 + References No definition available. + Details
Name: | fcel_ReserveForPerformanceGuarantees
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccruedLiabilitiesCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration