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Inventories - Components of Inventories (Short and Long Term) (Parenthetical) (Details) - USD ($) $ in Millions | Jul. 31, 2020 | Oct. 31, 2019
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Inventory Disclosure [Abstract] |  |
Completed standard component and modules | $ 19.6 | $ 23.5

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- Definition Completed standard component and modules. + References No definition available. + Details
Name: | fcel_CompletedStandardComponentAndModules
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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