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Accounts Receivable - Schedule of Accounts Receivable (Details) (Parenthetical) - USD ($) $ in Thousands		Oct. 31, 2017	Oct. 31, 2016
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: