Earnings (Loss) Per Share Calculation

9 Months Ended

Jul. 31, 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 July 31,						Nine Months Ended July 31,
Numerator	2012			2013			2012			2013
Net loss	$	(29,817	)	$	(1,231	)	$	(105,250	)	$	(75,634	)

	Quarter Ended July 31,		Nine Months Ended July 31,
Denominator	2012	2013	2012	2013
Weighted average basic common shares outstanding	99,530	102,713	98,922	101,951
Weighted average dilutive potential common shares outstanding	99,530	102,713	98,922	101,951

	Quarter Ended July 31,						Nine Months Ended July 31,
EPS	2012			2013			2012			2013
Basic EPS	$	(0.30	)	$	(0.01	)	$	(1.06	)	$	(0.74	)
Diluted EPS	$	(0.30	)	$	(0.01	)	$	(1.06	)	$	(0.74	)

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 periods indicated (in thousands):

	Quarter Ended July 31,		Nine Months Ended July 31,
	2012	2013	2012	2013
Shares underlying stock options and restricted stock units	5,294	3,599	5,681	3,727
0.25% Convertible Senior Notes due May 1, 2013	5,470	—	5,470	3,580
4.0% Convertible Senior Notes due March 15, 2015	18,396	9,198	18,396	10,990
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	—	7,406
Total shares excluded due to anti-dilutive effect	59,624	52,459	60,011	56,167