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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 27, 2014
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Basic net income per share        
Net income, basic   $ 410,395 $ 370,885 $ 328,234
Shares, basic   135,582 137,769 139,415
Per share amount, basic (in dollars per share)   $ 3.03 $ 2.69 $ 2.35
Dilutive stock options and restricted stock units outstanding, income $ 0 $ 0 $ 0  
Dilutive stock options and restricted stock units outstanding, shares   1,263 1,666 2,308
Dilutive stock options and restricted stock units outstanding, per share (in dollars per share)   $ (0.03) $ (0.03) $ (0.03)
Diluted net income per share        
Shares, diluted   136,845 139,435 141,723
Diluted net income per share (in dollars per share)   $ 3.00 $ 2.66 $ 2.32
Anitdilutive securities excluded from computation of earnings per share   900 1,000 600