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Other Assets - Schedule of Other Assets (Parenthetical) (Details) $ in Millions | Apr. 30, 2021 USD ($) | Oct. 31, 2020 USD ($) | Jun. 29, 2016 customer
--- | --- | --- | ---
Other Assets Noncurrent [Abstract] |  |  |
Number of customers under agreement | customer |  |  | 1
Contractual Obligation | $ | $ 2.4 | $ 2.4 |

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