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Pension Costs, which Include Costs for Qualified, Nonqualified and Union Plans (Detail) (Pension Plan, Defined Benefit [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 29, 2013
Dec. 30, 2012
Dec. 25, 2011
Pension Plan, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service cost-benefits earned during the period $ 7,538 $ 7,545 $ 7,833
Defined Benefit Plan, Interest Cost 141,030 155,376 171,339
Expected return on plan assets (198,216) (189,863) (211,659)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 7,566 7,689 7,580
Amortization of actuarial loss 63,212 53,429 37,901
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 21,130 34,176 12,994
Settlement and special termination benefit charge/(credit) 3,077 7,946 1,068
Total pension cost (benefit) $ 24,207 $ 42,122 $ 14,062