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Cover - USD ($)
$ in Billions
 12 Months Ended
Oct. 28, 2023
Dec. 08, 2023
Apr. 28, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Oct. 28, 2023    
Current Fiscal Year End Date --10-28    
Document Transition Report false    
Entity File Number 001-36250    
Entity Registrant Name Ciena Corp    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 23-2725311    
Entity Address, Address Line One 7035 Ridge Road    
Entity Address, City or Town Hanover    
Entity Address, State or Province MD    
Entity Address, Postal Zip Code 21076    
City Area Code 410    
Local Phone Number 694-5700    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol CIEN    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 6.8
Entity Common Stock, Shares Outstanding   144,830,337  
Documents Incorporated by Reference
Part III of the Form 10-K incorporates by reference certain portions of the registrant’s definitive proxy statement for its 2024 Annual Meeting of Stockholders to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this report.
    
Entity Central Index Key 0000936395    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false