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Benefit Plans - Accumulated Other Comprehensive Loss That Have Not Yet Been Recognized as Components of Net Periodic Benefit Cost (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 29, 2013
Defined Benefit Plan Disclosure [Line Items]  
Net periodic benefit cost, beginning balance $ (156,805)
Actuarial Gain (Loss), Net periodic benefit cost 42,726
Reclassification Adjustments, Net periodic benefit cost 16,499
Net periodic benefit cost, ending balance (97,580)
Pension Plans [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial loss, beginning balance (126,165)
Actuarial gain (loss) 39,337
Reclassification Adjustments, Actuarial loss 15,041
Actuarial loss, ending balance (71,787)
Prior service cost (credit), beginning balance (56)
Actuarial Gain (Loss), Prior service cost (credit) (171)
Reclassification Adjustments, Prior service cost (credit) 28
Prior service cost (credit), ending balance (199)
Postretirement Medical [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial loss, beginning balance (37,771)
Actuarial gain (loss) 3,560
Reclassification Adjustments, Actuarial loss 2,943
Actuarial loss, ending balance (31,268)
Prior service cost (credit), beginning balance 7,187
Actuarial Gain (Loss), Prior service cost (credit) 0
Reclassification Adjustments, Prior service cost (credit) (1,513)
Prior service cost (credit), ending balance $ 5,674