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Comprehensive Income (Tables)
9 Months Ended
Sep. 28, 2012
Comprehensive Income Tables [Abstract]  
Components of Accumulated Other Comprehensive Income
   Sep 28, Dec 30,
   2012 2011
 Pension and postretirement     
  medical liability adjustment$ (71,049) $ (75,658)
 Cumulative translation adjustment  (6,841)   (823)
 Total$ (77,890) $ (76,481)