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Reconciliation of Benefit Obligations and Funded Status of Postretirement Benefit Plans (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 29, 2013
Dec. 30, 2012
Dec. 25, 2011
Change in benefit obligations      
Benefit obligations at end of year $ 3,672,249    
Change in plan assets      
Fair value of plan assets at end of year 3,028,467 [1] 2,552,316 [1]  
Benefit obligations at end of year 3,672,249    
Accrued postretirement benefit cost:      
Noncurrent 129,078 149,937  
Other Postretirement Benefit Plans, Defined Benefit
      
Change in benefit obligations      
Benefit obligations at beginning of year 169,592 184,131  
Service cost 529 545 611
Defined Benefit Plan, Interest Cost 5,656 7,744 9,205
Plan participants' contributions 9,629 10,362  
Plan amendments (496) 0  
Actuarial gain (loss) (16,476) (5,877)  
Gross benefits paid (28,022) (29,245)  
Federal subsidy on benefits paid 4,169 1,932  
Acquisitions 2,228 0  
Benefit obligations at end of year 146,809 169,592 184,131
Change in plan assets      
Fair value of plan assets at beginning of year 0 0  
Employer contributions 18,393 18,883  
Plan participants' contributions 9,629 10,362  
Gross benefits paid (28,022) (29,245)  
Fair value of plan assets at end of year 0 0 0
Benefit obligations at end of year 146,809 169,592 184,131
Accrued postretirement benefit cost:      
Current 17,731 19,655  
Noncurrent $ 129,078 $ 149,937  
[1] The company uses a Dec. 31 measurement date for its retirement plans.