Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - 2017 Stock Incentive Plan (Details)

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Stockholders' Equity - 2017 Stock Incentive Plan (Details) - $ / shares
12 Months Ended
Dec. 27, 2018
Dec. 28, 2017
Dec. 29, 2016
Sep. 14, 2018
May 29, 2018
Nov. 20, 2017
Jul. 25, 2017
May 02, 2017
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of options granted 926,775 1,339,668 2,025,535            
Share price $ 26.01     $ 37.250 $ 45.80 $ 36.00 $ 40.00 $ 21.00  
2011 Stock Option Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares of stock authorized under the plan     12,520,407           10,780,970
Shares available for grant     179,575           104,269
2017 Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares of stock authorized under the plan   5,000,000              
Shares available for grant 2,850,768 3,690,255              
Number of options granted   1,254,465              
Number of restricted shares granted   15,475              
Share price               $ 21.00