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Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 25, 2011
Dec. 26, 2010
Dec. 27, 2009
Consolidated Statements Of Stockholders' Equity [Abstract]      
Unrealized gain on derivative contracts, net of deferred taxes $ 4,663 $ 0 $ 134
Pension and postretirement, net of deferred taxes (benefit) $ (2,688) $ 0 $ 1,011