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CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 30, 2021
Oct. 31, 2020
Nov. 04, 2018
Significant Accounting Policies [Line Items]      
Cost method equity investments $ 8,578 $ 13,408  
Expected economic lives of finite-lived intangible assets (in years) 7 years    
Expected number of years Spares usage cost is expensed 4 years    
Cumulative amount of temporary differences for unremitted foreign earnings for which a deferred tax liability has not been recognized $ 475,000    
One-time employee termination benefits related to service period (in days) 60 days    
Accumulated deficit $ (3,785,132) $ (4,283,122)  
Effect of adoption of new accounting standard | Accounting Standards Update 2014-09      
Significant Accounting Policies [Line Items]      
Accumulated deficit     $ 49,800
Minimum      
Significant Accounting Policies [Line Items]      
Payment terms and cash received 30 days    
Maximum      
Significant Accounting Policies [Line Items]      
Payment terms and cash received 90 days    
Foreign exchange contract maturities 24 months    
Equipment, furniture and fixtures | Minimum      
Significant Accounting Policies [Line Items]      
Estimated useful lives capitalized and amortized straight-line (in years) 2 years    
Equipment, furniture and fixtures | Maximum      
Significant Accounting Policies [Line Items]      
Estimated useful lives capitalized and amortized straight-line (in years) 5 years    
Software and website development | Minimum      
Significant Accounting Policies [Line Items]      
Estimated useful lives capitalized and amortized straight-line (in years) 2 years    
Software and website development | Maximum      
Significant Accounting Policies [Line Items]      
Estimated useful lives capitalized and amortized straight-line (in years) 5 years