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Share-based Compensation - Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options exercised, Shares       (500)  
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Beginning balance, Shares   4,474 1,757 1,221  
Options granted, Shares   734 2,976 684  
Options exercised, Shares   (169) (238) (113)  
Options forfeited or expired, Shares   (33) (21) (35)  
Ending balance, Shares   5,006 4,474 1,757 1,221
Exercisable shares, Ending balance   2,402      
Beginning balance, Weighted average exercise price   $ 10.32 $ 8.50 $ 7.77  
Vested or expected to vest at December 30, 2017   5,006      
Granted, Weighted average exercise price   $ 17.50 11.15 9.22  
Options exercised, Weighted average exercise price   9.21 7.29 4.94  
Forfeited or expired, Weighted average exercise price   10.28 9.99 8.56  
Ending balance, Weighted average exercise price   11.41 $ 10.32 $ 8.50 $ 7.77
Exercisable at December 30, 2017, Weighted average exercise price   $ 9.74      
Beginning balance, Aggregate intrinsic value   $ 5,623,300 $ 4,373,800   $ 400,700
Vested or expected to vest at December 30, 2017, Weighted average exercise price   $ 11.41      
Beginning balance, Weighted average contractual term (years)   8 years 1 month 6 days 8 years 9 months 18 days 8 years 7 years 7 months 6 days
Exercisable at December 30, 2017, Weighted average contractual term (years)   6 years 1 month 6 days      
Vested or expected to vest at December 30, 2017, Weighted average contractual term (years) 3 years 7 years 9 months 18 days      
Exercised, Aggregate intrinsic value   $ 1,092,900 $ 2,304,700 $ 637,400  
Ending balance, Aggregate intrinsic value   26,952,300 $ 5,623,300 $ 4,373,800  
Exercisable at December 30, 2017, Aggregate intrinsic value   16,647,800      
Vested or expected to vest at December 30, 2017, Aggregate intrinsic value   $ 26,952,300