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Accrued Liabilities - Schedule of Accrued Liabilities Detail (Details) - USD ($) $ in Millions	Jul. 31, 2024	Oct. 31, 2023
Accrued Liabilities
Loss accruals on service contracts	$ 9.3	$ 9.5
Accruals for performance guarantees	$ 1.3	$ 1.2

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- Definition

loss reserve on service agreements

+ References

No definition available.

+ Details

Name:	fcel_LossReserveOnServiceAgreements
Namespace Prefix:	fcel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

reserve for performance guarantees

+ References

No definition available.

+ Details

Name:	fcel_ReserveForPerformanceGuarantees
Namespace Prefix:	fcel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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