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Funded Status and Amounts Recognized in Consolidated Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Participant contributions $ 364 $ 356 $ 400
Fair value of plan assets at beginning of year 365,671    
Actual return on plan assets 73,174 41,891 100
Participant contributions 364 356 400
Fair value of plan assets at end of year 428,605 365,671  
Fair value of plan assets 428,605 365,671  
Current liability (1,301) (1,288)  
Noncurrent liability (44,226) (159,158)  
Net Periodic Pension Cost
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Benefit obligation at beginning of year 514,636 472,793  
Service cost 708 610 478
Interest cost 20,089 21,670 20,923
Actuarial (gain) loss (46,213) 44,447  
Benefits paid (25,494) (24,884) (20,921)
Benefit obligation at end of year 463,726 514,636 472,793
Fair value of plan assets at beginning of year 365,671 330,085  
Actual return on plan assets 73,174 41,891  
Employer contribution 15,254 18,579  
Benefits paid (25,494) (24,884) (20,921)
Fair value of plan assets at end of year 428,605 365,671 330,085
Fair value of plan assets 428,605 365,671 330,085
Benefit obligations 463,726 514,636 472,793
Unfunded status and amount recognized at end of year (35,121) (148,965)  
Current liability (418) (421)  
Noncurrent liability (34,703) (148,544)  
Amount recognized at end of year (35,121) (148,965)  
Net actuarial (gain) loss before taxes 87,645 184,528  
Accumulated benefit obligation at end of year 462,754 513,396  
Net Periodic Postretirement Benefit Cost
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Benefit obligation at beginning of year 11,481 13,889  
Service cost 341 458 426
Interest cost 380 605 687
Participant contributions 364 356  
Actuarial (gain) loss 214 (2,513)  
Benefits paid (1,316) (1,366)  
Less federal subsidy on benefits paid 52 52  
Plan amendments (1,110)    
Benefit obligation at end of year 10,406 11,481 13,889
Employer contribution 952 1,010  
Participant contributions 364 356  
Benefits paid (1,316) (1,366)  
Benefit obligations 10,406 11,481 13,889
Unfunded status and amount recognized at end of year (10,406) (11,481)  
Current liability (883) (867)  
Noncurrent liability (9,523) (10,614)  
Amount recognized at end of year (10,406) (11,481)  
Net actuarial (gain) loss before taxes (3,135) (4,173)  
Prior service (credit) cost before taxes (1,422) (570)  
Accumulated benefit obligation at end of year $ (4,557) $ (4,743)