SEGMENT AND ENTITY WIDE DISCLOSURES - Entity Wide Reporting (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	$ 315,287	$ 312,887
Canada
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	229,707	226,451
United States
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	46,933	47,515
Other International
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	$ 38,647	$ 38,921