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Retirement Benefits
 6 Months Ended
Jun. 26, 2015
Retirement Benefits Abstract  
Retirement Benefits Text Block

4.       The components of net periodic benefit cost for retirement benefit plans were as follows (in thousands):

  Thirteen Weeks Ended Twenty-six Weeks Ended 
  June 26, June 27, June 26, June 27, 
  2015 2014 2015 2014 
 Pension Benefits            
 Service cost$ 1,907 $ 1,697 $ 4,003 $ 3,439 
 Interest cost  3,605   3,940   7,380   8,076 
 Expected return on assets  (4,659)   (5,211)   (9,576)   (10,630) 
 Amortization and other  2,426   1,355   4,779   2,688 
 Net periodic benefit cost$ 3,279 $ 1,781 $ 6,586 $ 3,573 
              
 Postretirement Medical            
 Service cost$ 150 $ 125 $ 300 $ 250 
 Interest cost  227   278   453   555 
 Amortization  (101)   (126)   (202)   (254) 
 Net periodic benefit cost$ 276 $ 277 $ 551 $ 551