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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
Amortization of prior service costs (11,501) (11,930) (12,646)
Change in prior service costs 0 (1,297) 677
Pension and other postretirement benefit items (190,357) (373,672) (44,886)
Pension Plans, Defined Benefit
      
Comprehensive Income (Loss) [Line Items]      
Current year actuarial loss (236,163)    
Amortization of actuarial loss 53,429    
Amortization of prior service costs 7,689    
Change in prior service costs 7,946    
Currency loss (11,585)    
Pension and other postretirement benefit items $ (178,684)