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Summary of Significant Accounting Policies - Net income per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 02, 2018
Oct. 03, 2017
Jul. 04, 2017
Apr. 04, 2017
Jan. 03, 2017
Sep. 27, 2016
Jun. 28, 2016
Mar. 29, 2016
Jan. 02, 2018
Jan. 03, 2017
Dec. 29, 2015
Revenue Recognition                      
Gift card breakage period                 3 years    
Gift card breakage                 $ 7,900 $ 7,600 $ 6,600
Advertising Costs                      
Advertising costs                 6,100 7,400 5,000
Net income per share, basic and diluted                      
Net income $ 57,738 $ 26,445 $ 38,166 $ 35,043 $ 32,381 $ 34,574 $ 38,585 $ 33,954 $ 157,392 $ 139,494 $ 116,523
Basic weighted average shares outstanding (in shares)                 46,930 47,981 48,833
Dilutive effect of equity awards (in shares)                 1,222 1,391 1,772
Diluted weighted average shares outstanding (in shares)                 48,152 49,372 50,605
Basic net income per share (in dollars per share) $ 1.26 $ 0.57 $ 0.80 $ 0.74 $ 0.68 $ 0.72 $ 0.80 $ 0.70 $ 3.35 $ 2.91 $ 2.39
Diluted net income per share (in dollars per share) $ 1.24 $ 0.56 $ 0.78 $ 0.71 $ 0.66 $ 0.70 $ 0.78 $ 0.68 $ 3.27 $ 2.83 $ 2.30
Antidilutive securities excluded from calculation of basic earnings per share (in shares)                 1,600 1,400 1,300
Restricted Shares and Restricted Share Units                      
Net income per share, basic and diluted                      
Antidilutive securities excluded from calculation of basic earnings per share (in shares)                 1,700 1,900 1,900