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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2015
Oct. 31, 2014
Foreign Exchange Forward | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 49.1us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
$ 51.5us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Foreign Exchange Forward | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative Asset, Notional Amount 202.7us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
194.5us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Interest Rate Cap | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative [Line Items]    
Derivative Asset, Notional Amount 248.8us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 247.5us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
$ 247.5us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Secured Debt | Term Loan | Interest Rate Cap | Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative, Basis Spread on Variable Rate 3.00%us-gaap_DerivativeBasisSpreadOnVariableRate
/ us-gaap_DebtInstrumentAxis
= cien_TermLoanMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
 
Secured Debt | Term Loan | Interest Rate Cap | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Cap Interest Rate 0.75%us-gaap_DerivativeCapInterestRate
/ us-gaap_DebtInstrumentAxis
= cien_TermLoanMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
 
Secured Debt | Term Loan | Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Swaption Interest Rate   5.004%us-gaap_DerivativeSwaptionInterestRate
/ us-gaap_DebtInstrumentAxis
= cien_TermLoanMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember