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Fair Value Measurements (Details) (Fair Value, Inputs, Level 1 [Member], USD $)
In Millions, unless otherwise specified
Sep. 25, 2012
Dec. 27, 2011
Fair Value, Inputs, Level 1 [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure $ 48.2 $ 27.5