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Commitments and Contingencies (Details) - USD ($)
$ in Millions
Sep. 24, 2016
Dec. 26, 2015
Sep. 26, 2015
Commitments and Contingencies Disclosure [Abstract]      
Purchase Obligation, Due in Next Twelve Months $ 0.0    
Letters of Credit Outstanding, Amount $ 44.4 $ 48.7 $ 42.8