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Interest Rate Swaps Schedule of Changes in AOCL Net of Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion $ 2,240 $ 2,283 $ 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0 0
Other Comprehensive Income (Loss), Net of Tax 1,371 1,392 $ 0
Ending fiscal year AOCI balance $ 2,763 $ 1,392