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Benefit Plans - Reconciliation of Beginning and Ending Balances of Benefit Obligation (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 29, 2013
Dec. 30, 2012
Jan. 01, 2012
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at end of year $ 226,265 $ 280,099  
Postretirement Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 69,828 64,696  
Service cost 1,626 1,256 961
Interest cost 2,877 2,981 2,926
Plan participants' contributions 569 584  
Actuarial (gain)/loss (3,560) 4,287  
Benefits paid (3,611) (4,030)  
Medicare Part D subsidy reimbursement 111 54  
Benefit obligation at end of year $ 67,840 $ 69,828 $ 64,696