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Stock-Based Compensation (Stock Option Vested or Expected to Vest and are Exercisable) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 29, 2018
USD ($)
$ / shares
shares
Expected to vest  
Number (shares) | shares 1,864,724
Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 39.92
Weighted-Average Remaining Exercisable Period (years) 7 years 11 months 16 days
Aggregate Intrinsic Value ($000s) | $ $ 1,779
Exercisable  
Number (shares) | shares 1,625,587
Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 33.21
Weighted-Average Remaining Exercisable Period (years) 4 years 4 months 25 days
Aggregate Intrinsic Value ($000s) | $ $ 5,893