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Information for Company Retirement Plans for which the Projected Benefit Obligation Exceeds Assets (Detail) (Pension Plans, Defined Benefit, USD $)
In Thousands, unless otherwise specified
Dec. 25, 2011
Dec. 26, 2010
Pension Plans, Defined Benefit
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligation $ 3,351,494 $ 3,148,228
Fair value of plan assets $ 2,408,768 $ 2,514,939