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Pension and Other Postretirement Benefits Pension Benefits - Schedule of Multiemployer Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended
Sep. 23, 2012
Sep. 25, 2011
Sep. 23, 2012
Sep. 25, 2011
Jun. 26, 2011
Withdrawal from Multiemployer Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]          
Pension withdrawal expense $ 0 $ 0 $ 0 $ 4,228 $ 4,228