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Inventories - Components of Inventories (Parenthetical) (Details) - USD ($) $ in Millions | Jul. 31, 2018 | Oct. 31, 2017
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Inventory Disclosure [Abstract] |  |
Completed Standard Component | $ 30.0 | $ 46.3

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- Definition Completed Standard Component + References No definition available. + Details
Name: | fcel_CompletedStandardComponent
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