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Earnings Per Share (Tables)
6 Months Ended
Jun. 26, 2015
Earnings Per Share Tables [Abstract]  
Computation of basic and diluted earnings per share
   Thirteen Weeks Ended Twenty-six Weeks Ended
   June 26, June 27, June 26, June 27,
   2015 2014 2015 2014
              
 Net earnings available to           
  common shareholders$ 172,637 $ 66,236 $ 241,478 $ 116,981
              
 Weighted average shares           
  outstanding for basic           
  earnings per share  58,235   60,453   58,608   60,637
              
 Dilutive effect of stock           
  options computed using the           
  treasury stock method and           
  the average market price  1,387   1,575   1,436   1,596
              
 Weighted average shares           
  outstanding for diluted           
  earnings per share  59,622   62,028   60,044   62,233
              
 Basic earnings per share$ 2.96 $ 1.10 $ 4.12 $ 1.93
              
 Diluted earnings per share$ 2.90 $ 1.07 $ 4.02 $ 1.88