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Inventories - Components of Inventories (Parenthetical) (Details) - USD ($) $ in Millions | Apr. 30, 2021 | Oct. 31, 2020
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Inventory Disclosure [Abstract] |  |
Completed standard component and modules | $ 22.2 | $ 19.6

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- Definition Completed standard component and modules. + 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration