SHORT-TERM AND LONG-TERM DEBT (Details) - Term Loan - Secured Debt - USD ($)		3 Months Ended
		Jan. 31, 2016	Jul. 15, 2014
Debt Instrument [Line Items]
Term loan principal amount		$ 246,250,000	$ 250,000,000
Term loan unamortized discount		1,002,000
Term loan, net carrying amount	[1]	245,248,000
Term loan fair value	[1],[2]	245,019,000
Repayments of notes payable		$ 600,000

[1] Includes unamortized bond discount.

[2] The Term Loan is categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of its Term Loan using a market approach based upon observable inputs, such as current market transactions involving comparable securities.