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Postretirement Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Loss) Income (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 30, 2012
Dec. 25, 2011
Dec. 26, 2010
Comprehensive Income (Loss) [Line Items]      
Current year actuarial loss $ (230,799) $ (403,495) $ (106,095)
Amortization of actuarial loss 55,372 43,345 51,819
Pension and other postretirement benefit items (190,357) (373,672) (44,886)
Other Postretirement Benefit Plans, Defined Benefit
     
Comprehensive Income (Loss) [Line Items]      
Current year actuarial loss 5,364    
Amortization of actuarial loss 1,943    
Amortization of prior service costs (19,190) (19,510) (19,377)
Pension and other postretirement benefit items $ (11,883)