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Components of Net Periodic Benefit Cost (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Net Periodic Pension Cost
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 610 $ 478 $ 388
Interest cost 21,670 20,923 18,666
Expected return on plan assets (26,301) (24,712) (20,663)
Settlement loss   172  
Actuarial gain 5,085 2,725 2,177
Net periodic pension cost (income) 1,064 (414) 568
Current year actuarial (gain) loss 28,857 67,015 11,924
Settlement loss   (172)  
Amortization of actuarial gain (5,085) (2,725) (2,177)
Total recognized in other comprehensive (loss) income 23,772 64,118 9,747
Total recognized in net periodic benefit cost and other comprehensive (income) loss 24,836 63,704 10,315
Net Periodic Postretirement Benefit Cost
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 458 426 632
Interest cost 605 687 875
Prior service cost (257) (257) (174)
Actuarial gain (299) (48) (59)
Net periodic pension cost (income) 507 808 1,274
Current year actuarial (gain) loss (2,492) [1] (158) [1] (2,055) [1]
Mid-year accounting adjustment prior service (credit)     (109)
Amortization of actuarial gain 299 48 59
Amortization of prior service (cost) credit 257 257 174
Total recognized in other comprehensive (loss) income (1,936) 147 (1,931)
Total recognized in net periodic benefit cost and other comprehensive (income) loss $ (1,429) $ 955 $ (657)
[1] Includes (gain) loss related to (higher) lower than expected Medicare Part D subsidy receipts.