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Inventories - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jan. 31, 2019 | Jan. 31, 2018
Costs of Revenues [Member] |  |
Inventory [Line Items] |  |
Excess plant capacity and manufacturing variances cost incurred | $ 3.2 | $ 2.7

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- Definition Excess plant capacity and manufacturing variances cost. + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_InventoryLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |