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Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands | Apr. 30, 2022 | Oct. 31, 2021
--- | --- | ---
Other Assets |  |
Long-term stack residual value |  | $ 263
Long-term unbilled receivables | $ 10,542 | 11,581
Other | 5,000 | 5,154
Other assets | $ 15,542 | $ 16,998

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- Definition Contract with customer unbilled receivables noncurrent. + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition long-term stack residual value + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of noncurrent assets classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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- References No definition available. + Details
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