EARNINGS (LOSS) PER SHARE CALCULATION

6 Months Ended

Apr. 30, 2016

Earnings Per Share [Abstract]

EARNINGS (LOSS) PER SHARE CALCULATION

EARNINGS (LOSS) 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 per common share (“Basic EPS”) and the diluted net income 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 restricted stock units, (iii) shares issuable under Ciena’s employee stock purchase plan and upon exercise of outstanding stock options, using the treasury stock method, and (iv) shares underlying Ciena’s outstanding convertible notes.

	Quarter Ended April 30,				Six Months Ended April 30,
Numerator	2016		2015		2016		2015
Net income	$	13,997	$	20,653	$	2,451	$	1,874
Add: Interest expense associated with 0.875% Convertible Senior Notes due 2017	—		1,387		—		—
Net income used to calculate Diluted EPS	$	13,997	$	22,040	$	2,451	$	1,874

	Quarter Ended April 30,		Six Months Ended April 30,
Denominator	2016	2015	2016	2015
Basic weighted average shares outstanding	137,950	113,555	137,313	110,578
Add: Shares underlying outstanding stock options and restricted stock units and issuable under employee stock purchase plan	939	1,354	1,380	1,184
Add: Shares underlying 0.875% Convertible Senior Notes due 2017	—	13,108	—	—
Dilutive weighted average shares outstanding	138,889	128,017	138,693	111,762

	Quarter Ended April 30,				Six Months Ended April 30,
EPS	2016		2015		2016		2015
Basic EPS	$	0.10	$	0.18	$	0.02	$	0.02
Diluted EPS	$	0.10	$	0.17	$	0.02	$	0.02

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,
	2016	2015	2016	2015
Shares underlying stock options and restricted stock units	2,439	961	2,092	1,923
4.0% Convertible Senior Notes due March 15, 2015	—	4,346	—	6,772
0.875% Convertible Senior Notes due June 15, 2017	12,583	—	12,748	13,108
3.75% Convertible Senior Notes due October 15, 2018	17,356	17,356	17,356	17,356
4.0% Convertible Senior Notes due December 15, 2020	9,198	9,198	9,198	9,198
Total shares excluded due to anti-dilutive effect	41,576	31,861	41,394	48,357