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Employee Benefit Plans (Amounts Recognized in the Consolidated Balance Sheets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 26, 2012
Dec. 28, 2011
Pension Plan [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Other current liabilities $ 0 $ 0
Other noncurrent liabilities and deferred credits (15,920) (17,198)
Net amount recognized (15,920) (17,198)
Other Defined Benefit Plans [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Other current liabilities (341) (338)
Other noncurrent liabilities and deferred credits (2,496) (2,351)
Net amount recognized $ (2,837) $ (2,689)