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Inventories - Components of Inventories (Parenthetical) (Details) - USD ($) $ in Millions	Oct. 31, 2019	Oct. 31, 2018
Inventory Disclosure [Abstract]
Completed standard component	$ 23.5	$ 19.0

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_InventoryDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration