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Retirement Benefits (Tables)
9 Months Ended
Sep. 28, 2012
Retirement Benefits Tables [Abstract]  
Components of Net Periodic Benefit Cost
  Thirteen Weeks Ended Thirty-nine Weeks Ended 
  Sep 28, Sep 30, Sep 28, Sep 30, 
  2012 2011 2012 2011 
 Pension Benefits            
 Service cost$ 1,565 $ 865 $ 4,579 $ 3,330 
 Interest cost  3,458   3,076   10,256   9,816 
 Expected return on assets  (4,188)   (3,852)   (11,872)   (11,852) 
 Amortization and other  2,918   1,524   8,413   4,470 
 Net periodic benefit cost$ 3,753 $ 1,613 $ 11,376 $ 5,764 
              
 Postretirement Medical            
 Service cost$ 167 $ 202 $ 442 $ 452 
 Interest cost  240   264   740   914 
 Amortization  (122)   (68)   (197)   (68) 
 Net periodic benefit cost$ 285 $ 398 $ 985 $ 1,298