Fair Value Disclosures (Assets Measured At Fair Value On Non-Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 28, 2016	Dec. 23, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired long lived assets	$ 192	$ 0
Fair value of other long-lived assets	0	857
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired long lived assets	0	0
Fair value of other long-lived assets	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired long lived assets	0	0
Fair value of other long-lived assets	0	750
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired long lived assets	192	0
Fair value of other long-lived assets	$ 0	$ 107