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Inventories - Components of Inventories (Parenthetical) (Details) - USD ($) $ in Millions	Jul. 31, 2021	Oct. 31, 2020
Inventories
Completed standard component and modules	$ 18.6	$ 19.6

X

- 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