Earnings (Loss) Per Share Calculation

6 Months Ended

Apr. 30, 2013

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 (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 (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	2012			2013			2012			2013
Net loss	$	(27,780	)	$	(27,079	)	$	(75,433	)	$	(74,403	)

	Quarter Ended April 30,		Six Months Ended April 30,
Denominator	2012	2013	2012	2013
Basic weighted average shares outstanding	98,981	101,913	98,525	101,560
Dilutive weighted average shares outstanding	98,981	101,913	98,525	101,560

	Quarter Ended April 30,						Six Months Ended April 30,
EPS	2012			2013			2012			2013
Basic EPS	$	(0.28	)	$	(0.27	)	$	(0.77	)	$	(0.73	)
Diluted EPS	$	(0.28	)	$	(0.27	)	$	(0.77	)	$	(0.73	)

The following table summarizes the weighted average shares excluded from the calculation of the denominator for Basic and Diluted EPS due to their anti-dilutive effect for the fiscal years indicated (in thousands):

	Quarter Ended April 30,		Six Months Ended April 30,
	2012	2013	2012	2013
Shares underlying stock options, restricted stock units and warrants	6,074	4,267	6,054	4,366
0.25% Convertible Senior Notes due May 1, 2013	5,470	5,288	5,470	5,379
4.0% Convertible Senior Notes due March 15, 2015	18,396	9,198	18,396	11,891
0.875% Convertible Senior Notes due June 15, 2017	13,108	13,108	13,108	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	—	6,505
Total excluded due to anti-dilutive effect	60,404	58,415	60,384	58,605