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Stock-Based Compensation - 2009 Employee Stock Purchase Plan (Details) - 2009 Employee Stock Purchase Plan - $ / shares
shares in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Stock-Based Compensation      
Minimum exercise price as percentage of fair market value of shares on the date of grant 85.00%    
Term of award 24 months 24 months 24 months
Shares issued 223 239 224
Weighted average fair value for purchase rights granted (in dollars per share) $ 22.59