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SHORT-TERM AND LONG-TERM DEBT (Details 3)
$ in Thousands
Jan. 31, 2016
USD ($)
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value $ 1,015,568
Fair Value 1,098,411 [1]
0.875% Convertible Senior Notes due June 15, 2017  
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value 479,985
Fair Value $ 471,285 [1]
Interest rate on convertible notes 0.875%
3.75% Convertible Senior Notes due October 15, 2018  
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value $ 350,000
Fair Value $ 401,188 [1]
Interest rate on convertible notes 3.75%
4.0% Convertible Senior Notes due December 15, 2020  
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value $ 185,583 [2]
Fair Value $ 225,938 [1],[2]
Interest rate on convertible notes 4.00%
[1] The convertible notes are categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of its outstanding convertible notes using a market approach based upon observable inputs, such as current market transactions involving comparable securities.
[2] Includes unamortized discount and accretion of principal.