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NET INCOME PER SHARE (Tables)
 9 Months Ended
Sep. 28, 2012
Earnings Per Share [Abstract]  
Schedule of adjusted net income and diluted common shares
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 28,
2012
 
September 30,
2011
 
September 28,
2012
 
September 30,
2011
   Net income
$
14.3

 
$
13.9

 
$
26.2

 
$
23.2

 
 
 
 
 
 
 
 
Weighted average number of common shares used in basic net income per common share
39.5

 
41.6

 
39.5

 
42.8

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

 
0.4

 
0.3

 
0.4

Weighted average number of common shares used in diluted net income per common share
39.9

 
42.0

 
39.8

 
43.2

   Net income per common share:
 
 
 
 
 
 
 
Basic
$
0.36

 
$
0.33

 
$
0.66

 
$
0.54

Diluted
$
0.36

 
$
0.33

 
$
0.66

 
$
0.54

 
 
 
 
 
 
 
 
Anti-dilutive shares
0.7

 
1.1

 
0.7

 
0.7