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Other Assets - Schedule of Other Assets (Parenthetical) (Details) $ in Millions	Jan. 31, 2022 USD ($)	Jun. 29, 2016 customer
Other Assets
Number of customers under agreement | customer		1
Contractual Obligation | $	$ 2.2

X

- Definition

Number of customers under agreement.

+ References

No definition available.

+ Details

Name:	fcel_NumberOfCustomersUnderAgreement
Namespace Prefix:	fcel_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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