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Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jul. 31, 2019 | Oct. 31, 2018
Schedule Of Accrued Liabilities [Line Items] |  |
Product warranty accrual, payment and adjustments | $ 0.1 |
Loss reserve on service agreements | 1.7 | $ 0.9
Bridgeport Fuel Cell Project [Member] |  |
Schedule Of Accrued Liabilities [Line Items] |  |
Reserve for performance guarantees | $ 0.8 | $ 1.1

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- Definition loss reserve on service agreements + References No definition available. + Details
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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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- Definition Schedule of accrued liabilities. + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |