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Asset Allocation for Company-Sponsored Pension Plans and Target Allocations by Asset Category (Detail) (Pension Plans, Defined Benefit)
12 Months Ended
Dec. 25, 2011
Dec. 26, 2010
Pension Plans, Defined Benefit
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Equity securities, target allocation for 2012 47.00%  
Debt securities, target allocation for 2012 35.00%  
Other, target allocation for 2012 18.00%  
Total target allocation for 2012 100.00%  
Equity securities 46.00% 42.00%
Debt securities 39.00% 44.00%
Other 15.00% 14.00%
Total 100.00% 100.00%