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NET INCOME PER SHARE
9 Months Ended
Sep. 30, 2011
NET INCOME PER SHARE
NOTE 11:
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 30,
2011
 
September 24,
2010
 
September 30,
2011
 
September 24,
2010
   Net income
$
13.9

 
$
10.2

 
$
23.2

 
$
15.9

 
 
 
 
 
 
 
 
Weighted average number of common shares used in basic net income per common share
41.6

 
43.3

 
42.8

 
43.2

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

 
0.2

 
0.4

 
0.3

Weighted average number of common shares used in diluted net income per common share
42.0

 
43.5

 
43.2

 
43.5

   Net income per common share:
 
 
 
 
 
 
 
Basic
$
0.33

 
$
0.24

 
$
0.54

 
$
0.37

Diluted
$
0.33

 
$
0.23

 
$
0.54

 
$
0.37

 
 
 
 
 
 
 
 
Antidilutive stock options and other
1.1

 
1.1

 
0.7

 
1.0


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 and non-vested restricted stock except where their inclusion would be antidilutive.

Antidilutive 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. Antidilutive shares also include in-the-money options and non-vested restricted stock for which the sum of the assumed proceeds, including unrecognized compensation expense, exceeds the average stock price during the periods presented.