Net Income Per Share

Basic net income per share is based on the weighted effect of common shares issued and outstanding and is calculated by dividing net income by the basic weighted average shares outstanding during the period. Diluted net income per share is calculated by dividing net income by the weighted average number of common shares used in the basic net income per share calculation, plus the equivalent number of common shares that would be issued assuming exercise or conversion of all potentially dilutive common shares outstanding. These potentially dilutive items consist primarily of outstanding stock options and awards (including restricted stock units and market stock units).

The following table details the calculation of basic and diluted earnings per share for the three and six months ended September 23, 2017 and September 24, 2016 (in thousands, except per share amounts):

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	Three Months Ended				Six Months Ended
	September 23,		September 24,		September 23,		September 24,
	2017		2016		2017		2016
Numerator:
Net income	$	73,300	$	86,039	$	116,212	$	104,110
Denominator:
Weighted average shares outstanding	63,431		62,787		63,764		62,618
Effect of dilutive securities	2,929		3,623		2,997		3,483
Weighted average diluted shares	66,360		66,410		66,761		66,101
Basic earnings per share	$	1.16	$	1.37	$	1.82	$	1.66
Diluted earnings per share	$	1.10	$	1.30	$	1.74	$	1.58

The weighted outstanding shares excluded from our diluted calculation for the three and six months ended September 23, 2017 were 236 thousand and 222 thousand, respectively, as the shares were anti-dilutive. The weighted outstanding shares excluded from our diluted calculation for the three and six months ended September 24, 2016 were 4 thousand and 8 thousand, respectively, as the shares were anti-dilutive.