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Short-Term and Long-Term Debt Term Loan (Details) (USD $)
 3 Months Ended
Jan. 31, 2015
Jul. 15, 2014
Debt Instrument [Line Items]    
Term loan principal amount $ 248,750,000us-gaap_DebtInstrumentFaceAmount  
Term loan unamortized discount 1,110,000us-gaap_DebtInstrumentUnamortizedDiscount  
Term loan, net carrying amount 247,640,000us-gaap_NotesPayable  
Term loan fair value 247,817,000us-gaap_LongTermDebtFairValue [1]  
Term Loan | Secured Debt    
Debt Instrument [Line Items]    
Term loan principal amount 248,750,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cien_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cien_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Term loan unamortized discount 1,110,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= cien_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		  
Term loan, net carrying amount 247,640,000us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= cien_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [2]  
Term loan fair value 247,817,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= cien_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1],[2]  
Repayments of notes payable $ 600,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= cien_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		  
[1] The Term Loan was categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of its Term Loan using a market approach based upon observable inputs, such as current market transactions involving comparable securities.
[2] Includes unamortized bond discount.