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SEGMENT AND ENTITY WIDE DISCLOSURES - Entity Wide Reporting (Details) - USD ($)
$ in Thousands
Oct. 29, 2022
Oct. 30, 2021
Ciena's geographic distribution of equipment, furniture and fixtures    
Equipment, building, furniture and fixtures, net $ 312,887 $ 329,253
Canada    
Ciena's geographic distribution of equipment, furniture and fixtures    
Equipment, building, furniture and fixtures, net 226,451 240,968
United States    
Ciena's geographic distribution of equipment, furniture and fixtures    
Equipment, building, furniture and fixtures, net 47,515 50,744
Other International    
Ciena's geographic distribution of equipment, furniture and fixtures    
Equipment, building, furniture and fixtures, net $ 38,921 $ 37,541