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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. 03, 2017
Sep. 27, 2016
Jun. 28, 2016
Mar. 29, 2016
Dec. 29, 2015
Sep. 29, 2015
Jun. 30, 2015
Mar. 31, 2015
Jan. 03, 2017
Dec. 29, 2015
Dec. 30, 2014
Revenue Recognition                      
Gift card breakage period                 3 years    
Gift card breakage                 $ 7,600 $ 6,600 $ 5,400
Advertising Costs                      
Advertising costs                 7,400 5,000 6,200
Net income per share, basic and diluted                      
Net income $ 32,381 $ 34,574 $ 38,585 $ 33,954 $ 27,200 $ 26,176 $ 34,724 $ 28,423 $ 139,494 $ 116,523 $ 101,276
Basic weighted average shares outstanding (in shares)                 47,981 48,833 49,567
Dilutive effect of equity awards (in shares)                 1,391 1,772 2,017
Diluted weighted average shares outstanding (in shares)                 49,372 50,605 51,584
Basic net income per share (in dollars per share) $ 0.68 $ 0.72 $ 0.80 $ 0.70 $ 0.56 $ 0.54 $ 0.72 $ 0.58 $ 2.91 $ 2.39 $ 2.04
Diluted net income per share (in dollars per share) $ 0.66 $ 0.70 $ 0.78 $ 0.68 $ 0.54 $ 0.52 $ 0.69 $ 0.56 $ 2.83 $ 2.30 $ 1.96
Antidilutive securities excluded from calculation of basic earnings per share (in shares)                 1,400 1,300 1,000
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)                 1,900 1,900 1,800