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NET INCOME PER SHARE
 9 Months Ended
Sep. 27, 2013
Earnings Per Share [Abstract]  
NET INCOME PER SHARE
NET INCOME PER SHARE
Adjusted net income and diluted common shares were calculated as follows (in millions, except per share amounts):
 
Thirteen weeks ended
 
Thirty-nine weeks ended
 
September 27, 2013

September 28, 2012
 
September 27, 2013
 
September 28, 2012
Net income
$
19.0

 
$
14.3

 
$
30.4

 
$
26.2

 
 
 
 
 
 
 
 
Weighted average number of common shares used in basic net income per common share
40.3

 
39.5

 
40.1

 
39.5

Dilutive effect of outstanding stock options and non-vested restricted stock
0.4

 
0.4

 
0.3

 
0.3

Weighted average number of common shares used in diluted net income per common share
40.7

 
39.9

 
40.4

 
39.8

   Net income per common share:
 
 
 
 
 
 
 
Basic
$
0.47

 
$
0.36

 
$
0.76

 
$
0.66

Diluted
$
0.47

 
$
0.36

 
$
0.75

 
$
0.66


Basic net income per share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted net income per share is calculated by dividing net income by the weighted average number of common shares and potential common shares outstanding during the period. Potential common shares include the dilutive effects of outstanding options, non-vested restricted stock and performance share units except where their inclusion would be anti-dilutive.
Our anti-dilutive shares were 0.1 million for the thirty-nine weeks ended September 27, 2013 and 0.7 million for the thirteen and thirty-nine weeks ended September 28, 2012, respectively. We had no anti-dilutive shares for the thirteen weeks ended September 27, 2013. Anti-dilutive shares include unvested restricted stock, performance share units and in-the-money options for which the sum of the assumed proceeds, including unrecognized compensation expense, exceeds the average stock price during the periods presented. Anti-dilutive shares associated with our stock options relate to those stock options with an exercise price higher than the average market value of our stock during the periods presented.