Net Income Per Common Share

The computation of basic net income per common share for all periods presented is derived from the information on the condensed consolidated statements of income, and there are no reconciling items in the numerator used to compute diluted net income per common share. The following table summarizes the computation of basic and diluted net income per common share:



	Three Months Ended				Six Months Ended
(In thousands, except per share amounts)	September 30, 2017		October 1, 2016		September 30, 2017		October 1, 2016
Net income available to common stockholders	$	167,532	$	164,192	$	334,777	$	327,241
Weighted average common shares outstanding-basic	248,094		253,466		247,960		253,056
Dilutive effect of employee equity incentive plans	2,532		2,126		2,949		2,319
Dilutive effect of 2017 Convertible Notes	—		9,587		2,986		8,736
Dilutive effect of warrants	7,591		5,194		7,844		3,774
Weighted average common shares outstanding-diluted	258,217		270,373		261,739		267,885
Basic earnings per common share	$	0.68	$	0.65	$	1.35	$	1.29
Diluted earnings per common share	$	0.65	$	0.61	$	1.28	$	1.22

The total shares used in the denominator of the diluted net income per common share calculation include potentially dilutive common equivalent shares outstanding that are not included in basic net income per common share calculation. The diluted shares were calculated by applying the treasury stock method to the impact of the equity incentive plans, the incremental shares issuable assuming conversion of the Company's $600.0 million principal amount of 2.625% convertible notes issued in June 2010 (2017 Convertible Notes), before its maturity on June 15, 2017, and exercise of warrants on a weighted-average outstanding basis. The 2017 Convertible Notes matured during the first quarter of fiscal year 2018, and the Company exercised its call options to neutralize the dilutive effect of the incremental shares from the 2017 Convertible Notes. Because the number of diluted shares in the above table for the six months ended September 30, 2017 was calculated based on a weighted-average outstanding basis, it included approximately 3.0 million shares of dilutive impact from the 2017 Convertible Notes through the maturity date. See "Note 10. Debt and Credit Facility" for more discussion of the Company's debt, call options and warrants.

Outstanding stock options and RSUs under the Company's stock award plans to purchase approximately 1.0 million and 3.2 million shares, for the second quarter and the first six months of fiscal year 2018, respectively, were excluded from diluted net income per common share by applying the treasury stock method, as their inclusion would have been anti-dilutive. These options and RSUs could be dilutive in the future if the Company’s average share price increases and is greater than the combined exercise prices and the unamortized fair values of these options and RSUs.