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Postretirement Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Loss) Income (Detail) (Other Postretirement Benefit Plans, Defined Benefit, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 25, 2011
Other Postretirement Benefit Plans, Defined Benefit
  
Comprehensive Income (Loss) [Line Items]  
Current year actuarial loss $ (2,510)
Prior service credit change   
Amortization of actuarial loss 5,444
Amortization of prior service credit (19,510)
Total $ (16,576)