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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2017
Dec. 27, 2016
Accumulated Other Comprehensive Loss    
Balance as of beginning of period $ 750,226  
Balance as of end of period 839,079 $ 750,226
Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Loss    
Balance as of beginning of period (194) (109)
Other comprehensive loss before reclassification 252 (182)
Reclassification adjustments to income (1)   45
Income taxes (97) 52
Balance as of end of period (39) (194)
Cash Flow Hedges    
Accumulated Other Comprehensive Loss    
Balance as of beginning of period   (27)
Reclassification adjustments to income (1)   45
Income taxes   (18)
Foreign Currency Translation    
Accumulated Other Comprehensive Loss    
Balance as of beginning of period (194) (82)
Other comprehensive loss before reclassification 252 (182)
Income taxes (97) 70
Balance as of end of period $ (39) $ (194)