SEGMENTS AND ENTITY WIDE DISCLOSURES (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Oct. 31, 2015
Ciena's geographic distribution of revenue
Revenue	$ 573,115	$ 529,162
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	199,561		$ 191,973
North America
Ciena's geographic distribution of revenue
Revenue	392,704	331,535
EMEA
Ciena's geographic distribution of revenue
Revenue	80,722	111,006
CALA
Ciena's geographic distribution of revenue
Revenue	43,810	42,742
APAC
Ciena's geographic distribution of revenue
Revenue	55,879	43,879
United States
Ciena's geographic distribution of revenue
Revenue	365,200	$ 297,700
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	92,052		96,292
Canada
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	96,665		84,318
Other International
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	$ 10,844		$ 11,363