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Pension Costs, which Include Costs for Qualified, Nonqualified and Union Plans (Detail) (Pension Plans, Defined Benefit, USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Oct. 31, 2010
Dec. 25, 2011
Dec. 26, 2010
Dec. 27, 2009
Pension Plans, Defined Benefit
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost-benefits earned during the period   $ 7,833 $ 14,829 $ 14,439
Interest cost on benefit obligation   171,339 176,738 178,646
Expected return on plan assets   (211,659) (191,614) (171,472)
Amortization of prior service costs   7,580 6,731 1,641
Amortization of actuarial loss   37,901 46,870 48,541
Net periodic (benefit) cost   12,994 53,554 71,795
Curtailment gains (3,300)   (3,840)  
Settlement and special termination benefit charge/(credit)   1,068   (39,159)
Union and other pension cost   4,426 3,990 5,146
Total pension cost (benefit)   $ 18,488 $ 53,704 $ 37,782