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Convertible Notes Payable (Details) - Jul. 31, 2015 - USD ($)
$ in Thousands
Total
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value $ 1,032,910
Fair Value [1] 1,280,679
0.875% Convertible Senior Notes due June 15, 2017  
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value 500,000
Fair Value [1] $ 507,813
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 [1] $ 498,750
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 [2] $ 182,910
Fair Value [1],[2] $ 274,116
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.