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Accounts Receivable - Schedule of Accounts Receivable (Details) (Parenthetical) - USD ($) $ in Thousands | Oct. 31, 2017 | Oct. 31, 2016
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Accounts Notes And Loans Receivable [Line Items] |  |  |
U.S. government accounts receivable total | [1] | $ 9,286 | $ 5,531
Government [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
U.S. government accounts receivable total |  | $ 3,200 | $ 2,200
[1] | Total U.S. government accounts receivable outstanding as of October 31, 2017 and 2016 is $3.2 million and $2.2 million, respectively.

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- Definition U.S. government accounts receivable. + References No definition available. + Details
Name: | fcel_USGovernmentAccountsReceivable
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=us-gaap_GovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |