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v3.21.1

Project Assets - Summary of Project Assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Apr. 30, 2021 | Oct. 31, 2020
Project Assets [Line Items] |  |
Project Assets, gross | $ 223,375 | $ 190,627
Accumulated depreciation | (36,133) | (28,818)
Project Assets, net | 187,242 | 161,809
Project Assets - Operating [Member] |  |
Project Assets [Line Items] |  |
Project Assets, gross | $ 125,464 | 99,351
Project Assets - Operating [Member] | Minimum [Member] |  |
Project Assets [Line Items] |  |
Project assets estimated useful life | 5 years |
Project Assets - Operating [Member] | Maximum [Member] |  |
Project Assets [Line Items] |  |
Project assets estimated useful life | 20 years |
Project Assets - Construction in progress [Member] |  |
Project Assets [Line Items] |  |
Project Assets, gross | $ 97,911 | $ 91,276
Project Assets - Construction in progress [Member] | Minimum [Member] |  |
Project Assets [Line Items] |  |
Project assets estimated useful life | 7 years |
Project Assets - Construction in progress [Member] | Maximum [Member] |  |
Project Assets [Line Items] |  |
Project assets estimated useful life | 20 years |

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- Definition Long-term project assets. + References No definition available. + Details
Name: | fcel_LongTermProjectAssets
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Long term project assets gross. + References No definition available. + Details
Name: | fcel_LongTermProjectAssetsGross
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Project asset accumulated depreciation. + References No definition available. + Details
Name: | fcel_ProjectAssetAccumulatedDepreciation
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Project assets. + References No definition available. + Details
Name: | fcel_ProjectAssetsLineItems
Namespace Prefix: | fcel_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=fcel_ProjectAssetsOperatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=fcel_ProjectAssetsConstructionInProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |