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Net Income Per Share (Tables)
12 Months Ended
Dec. 30, 2017
Earnings Per Share [Abstract]  
Net income per share calculation
Net income per share is calculated as follows (in thousands, except per share amounts):
 
2017
 
Net
Income
 
Shares
 
Per Share
Amount
Basic net income per share
$
422,599

 
127,588

 
$
3.31

Dilutive stock options and restricted stock units outstanding

 
616

 
(0.01
)
Diluted net income per share
$
422,599

 
128,204

 
$
3.30


 
2016
 
Net
Income
 
Shares
 
Per Share
Amount
Basic net income per share
$
437,120

 
132,905

 
$
3.29

Dilutive stock options and restricted stock units outstanding

 
908

 
(0.02
)
Diluted net income per share
$
437,120

 
133,813

 
$
3.27


 
2015
 
Net
Income
 
Shares
 
Per Share
Amount
Basic net income per share
$
410,395

 
135,582

 
$
3.03

Dilutive stock options and restricted stock units outstanding

 
1,263

 
(0.03
)
Diluted net income per share
$
410,395

 
136,845

 
$
3.00