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Share-Based Compensation - Non-vested stock options (Details) - Options
 12 Months Ended
Dec. 29, 2018
$ / shares
shares
Options, Number of Shares  
Non-vested balance at the beginning of the period (in shares) | shares 209,078
Granted (in shares) | shares 22,443
Vested (in shares) | shares (113,829)
Forfeited (in shares) | shares (1,408)
Non-vested balance at the end of the period (in shares) | shares 116,284
Options, Weighted-Average Grant Date Fair Value  
Non-vested balance at the beginning of the period (in dollars per share) | $ / shares $ 8.98
Granted (in dollars per share) | $ / shares 19.96
Vested (in dollars per share) | $ / shares 9.41
Forfeited (in dollars per share) | $ / shares 10.08
Non-vested balance at the end of the period (in dollars per share) | $ / shares $ 10.64