Earnings Per Share Calculation (Tables)

3 Months Ended

Jan. 30, 2021

Earnings Per Share [Abstract]

Schedule of Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share

The following tables (in thousands, except per share amounts) reconcile basic net income per common share (“Basic EPS”) and 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 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
	January 30,		February 1,
Numerator	2021		2020
Net income used to calculate Basic and Diluted EPS	$	55,348	$	62,328

	Quarter Ended
	January 30,	February 1,
Denominator	2021	2020
Basic weighted average shares outstanding	155,174	154,334
Add: Shares underlying outstanding stock options and stock unit awards and issuable under employee stock purchase plan	1,409	1,404
Dilutive weighted average shares outstanding	156,583	155,738

	Quarter Ended
	January 30,		February 1,
EPS	2021		2020
Basic EPS	$	0.36	$	0.40
Diluted EPS	$	0.35	$	0.40

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 30,	February 1,
	2021	2020
Shares underlying stock options and stock unit awards	135	731
Total shares excluded due to anti-dilutive effect	135	731