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Benefit Plans - Components of Net Periodic Postretirement Benefit Cost Reconciliation (Detail) (Postretirement Benefits [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 29, 2013
Dec. 30, 2012
Jan. 01, 2012
Postretirement Benefits [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1,626 $ 1,256 $ 961
Interest cost 2,877 2,981 2,926
Amortization of unrecognized transitional assets 0 0 (18)
Recognized net actuarial loss 2,943 2,339 2,345
Amortization of prior service cost (1,513) (1,513) (1,717)
Net periodic pension cost $ 5,933 $ 5,063 $ 4,497