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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. 25, 2011
Dec. 26, 2010
Dec. 27, 2009
Change in benefit obligations      
Benefit obligations at end of year $ 3,351,494    
Change in plan assets      
Fair value of plan assets at end of year 2,518,515 [1] 2,644,352 [1]  
Benefit obligations at end of year 3,351,494    
Accrued postretirement benefit cost:      
Noncurrent 163,699 168,322  
Other Postretirement Benefit Plans, Defined Benefit
      
Change in benefit obligations      
Benefit obligations at beginning of year 191,282 208,213  
Service cost 611 713 1,405
Interest cost 9,205 10,606 13,339
Plan participants' contributions 10,896 11,708  
Plan amendments   (677)  
Actuarial gain (loss) 2,482 (6,121)  
Gross benefits paid (32,386) (35,658)  
Federal subsidy on benefits paid 2,041 2,498  
Benefit obligations at end of year 184,131 191,282 208,213
Change in plan assets      
Fair value of plan assets at beginning of year        
Employer contributions 21,490 23,950  
Plan participants' contributions 10,896 11,708  
Gross benefits paid (32,386) (35,658)  
Fair value of plan assets at end of year         
Benefit obligations at end of year 184,131 191,282 208,213
Accrued postretirement benefit cost:      
Current 20,432 22,960  
Noncurrent $ 163,699 $ 168,322  
[1] The company uses a Dec. 31 measurement date for its retirement plans.