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DEFINED BENEFIT RETIREMENT PLAN (Details2) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Defined benefit retirement plan      
Fair value pension plans $ 485,724 $ 424,495 $ 359,636
Level 2 member
     
Defined benefit retirement plan      
Fair value pension plans 485,724 424,495  
Temporary cash investments
     
Defined benefit retirement plan      
Fair value pension plans 12,091 1,556  
Temporary cash investments | Level 2 member
     
Defined benefit retirement plan      
Fair value pension plans 12,091 1,556  
Index linked gilts
     
Defined benefit retirement plan      
Fair value pension plans 107,366 97,422  
Index linked gilts | Level 2 member
     
Defined benefit retirement plan      
Fair value pension plans 107,366 97,422  
Corporate bonds
     
Defined benefit retirement plan      
Fair value pension plans 347,083 309,206  
Corporate bonds | Level 2 member
     
Defined benefit retirement plan      
Fair value pension plans 347,083 309,206  
Corporate stock
     
Defined benefit retirement plan      
Fair value pension plans 19,184 16,276  
Corporate stock | Level 2 member
     
Defined benefit retirement plan      
Fair value pension plans 19,184 16,276  
Other investments
     
Defined benefit retirement plan      
Fair value pension plans   35  
Other investments | Level 2 member
     
Defined benefit retirement plan      
Fair value pension plans   $ 35