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Components of Net Periodic Benefit (Income) Cost (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Amortization of prior service credit $ 257 $ 257 $ 257
Total recognized in other comprehensive (loss) income (5,378) (4,786) (2,849)
Net Periodic Pension Cost
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 708 610 478
Interest cost 20,089 21,670 20,923
Expected return on plan assets (28,680) (26,301) (24,712)
Settlement loss     172
Actuarial gain 6,177 5,085 2,725
Net periodic pension (income) cost (1,706) 1,064 (414)
Current year actuarial (gain) loss (90,706) 28,857 67,015
Settlement loss     (172)
Amortization of actuarial gain (6,177) (5,085) (2,725)
Total recognized in other comprehensive (loss) income (96,883) 23,772 64,118
Total recognized in net periodic benefit cost and other comprehensive (income) loss (98,589) 24,836 63,704
Net Periodic Postretirement Benefit Cost
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 341 458 426
Interest cost 380 605 687
Prior service credit (257) (257) (257)
Actuarial gain (799) (299) (48)
Net periodic pension (income) cost (335) 507 808
Current year actuarial (gain) loss 240 [1] (2,492) [1] (158) [1]
Current year prior service credit (1,110)    
Amortization of actuarial gain 799 299 48
Amortization of prior service credit 257 257 257
Total recognized in other comprehensive (loss) income 186 (1,936) 147
Total recognized in net periodic benefit cost and other comprehensive (income) loss $ (149) $ (1,429) $ 955
[1] Includes (gain) loss related to (higher) lower than expected Medicare Part D subsidy receipts.