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Earnings Per Share Calculation (Tables)
 3 Months Ended
Jan. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share

 
Quarter Ended January 31,
Numerator
2018
 
2017
Net income (loss)
$
(473,363
)
 
$
3,861


 
Quarter Ended January 31,
Denominator
2018
 
2017
Basic weighted average shares outstanding
143,922

 
140,682

Add: Shares underlying outstanding stock options and restricted stock units and issuable under employee stock purchase plan
—

 
1,502

Dilutive weighted average shares outstanding
143,922

 
142,184


 
Quarter Ended January 31,
EPS
2018
 
2017
Basic EPS
$
(3.29
)
 
$
0.03

Diluted EPS
$
(3.29
)
 
$
0.03
Schedule of Weighted Average Shares Excluded From Calculation of Denominator for Basic and Diluted EPS
The following table summarizes the weighted average shares excluded from the calculation of the denominator for Diluted EPS due to their anti-dilutive effect for the periods indicated (in thousands):
 
Quarter Ended January 31,
 
2018
 
2017
Shares underlying stock options and restricted stock units
3,414

 
1,556

0.875% Convertible Senior Notes due June 15, 2017
—

 
5,564

3.75% Convertible Senior Notes due October 15, 2018 (Original)
3,038

 
17,355

3.75% Convertible Senior Notes due October 15, 2018 (New) (1)
691

 
—

4.0% Convertible Senior Notes due December 15, 2020
9,198

 
9,198

Total shares excluded due to anti-dilutive effect
16,341

 
33,673


(1)
Since Ciena intends, upon any conversion of the outstanding 3.75% Convertible Senior Notes due 2018 (New Notes), to settle the principal amount thereof in cash, Ciena uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The 14.3 million shares underlying the New Notes will have a dilutive impact on diluted net income per share of common stock when the average market price of Ciena common stock for a given period exceeds the conversion price of $20.17 per share for the New Notes. During the first quarter of fiscal 2018, the average market price of Ciena common stock was $21.19 and, as such, the New Notes are dilutive by the conversion spread, or 0.7 million shares.