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Earnings Per Share Calculation
 6 Months Ended
Apr. 30, 2019
Earnings Per Share [Abstract]  
Earnings Per Share Calculation EARNINGS PER SHARE CALCULATION
The following table (in thousands except per share amounts) is a reconciliation of the numerator and denominator of the basic net income (loss) per common share (“Basic EPS”) and the diluted net income (loss) per potential common share (“Diluted EPS”). Basic EPS is computed using the weighted average number of common shares outstanding. Diluted EPS is computed using the weighted average number of the following, in each case, to the extent the effect is not anti-dilutive:
(i) common shares outstanding; (ii) shares issuable upon vesting of stock unit awards; and (iii) shares issuable under Ciena’s employee stock purchase plan and upon exercise of outstanding stock options, using the treasury stock method.

 
Quarter Ended April 30,
 
Six Months Ended April 30,
Numerator
2019
 
2018
 
2019
 
2018
Net income (loss)
$
52,738

 
$
13,856

 
$
86,354

 
$
(459,507
)
 
Quarter Ended April 30,
 
Six Months Ended April 30,
Denominator
2019
 
2018
 
2019
 
2018
Basic weighted average shares outstanding
156,170

 
143,975

 
156,244

 
143,948

Add: Shares underlying outstanding stock options and stock unit awards and issuable under employee stock purchase plan
2,119

 
1,345

 
1,967

 
—

Add: Shares underlying 3.75% Convertible Senior Notes due 2018 (New)
—

 
2,653

 
—

 
—

Dilutive weighted average shares outstanding
158,289

 
147,973

 
158,211

 
143,948


 
Quarter Ended April 30,
 
Six Months Ended April 30,
EPS
2019
 
2018
 
2019
 
2018
Basic EPS
$
0.34

 
$
0.10

 
$
0.55

 
$
(3.19
)
Diluted EPS
$
0.33

 
$
0.09

 
$
0.55

 
$
(3.19
)


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 April 30,
 
Six Months Ended April 30,
 
2019
 
2018
 
2019
 
2018
Shares underlying stock options and stock unit awards
283

 
304

 
257

 
2,496

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

 
3,038

 
—

 
3,038

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

 
—

 
—

 
1,672

4.0% Convertible Senior Notes due December 15, 2020
—

 
9,198

 
—

 
9,198

Total shares excluded due to anti-dilutive effect
283

 
12,540

 
257

 
16,404