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Restricted Cash - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Apr. 30, 2017 | Oct. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash and cash equivalents | $ 37,700 | $ 34,100
Restricted cash and cash equivalents - long-term | 33,088 | 24,692
Reserves for obligations | $ 16,600 |
Letter of credit date of expiration | Apr. 30, 2019 |
Letters of credit outstanding, amount | $ 3,900 | 7,900
Dominion Bridgeport FuelCell Park [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash and cash equivalents - long-term | $ 15,000 | $ 15,000
Debt instrument, term | 15 years |

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- Definition Letter of Credit Date of Expiration + References No definition available. + Details
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Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Reserves for obligations + 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 Restricted cash balance, term + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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
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- Definition Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | debit
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |