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Fair Value Measurement, Financial Instruments And Risk Management (Carrying And Fair Values Of Non-Current Financial Assets And Liabilities Not Measured At Fair Value On A Recurring Basis) (Details) - Estimated Fair Value - Senior Secured Credit Facility - USD ($)
$ in Thousands
Mar. 27, 2016
Dec. 27, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Amount $ 70,000 $ 70,000
Estimated Fair Value $ 70,000 $ 70,000