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Share-Based Compensation - Restricted Shares and Other (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 29, 2018
USD ($)
item
$ / shares
shares
Dec. 30, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
2006 Incentive Plan      
Additional disclosures      
Shares available for grant 747,926    
Options      
Additional disclosures      
Fair value of options vested | $ $ 1.1 $ 1.5 $ 1.5
Unrecognized compensation cost, net of expected forfeitures | $ $ 1.1    
Weighted-average period over which cost is expected to be recognized 2 years 6 months    
Forfeiture rate (as a percent) 0.40% 0.40% 0.50%
Restricted stock      
Additional disclosures      
Number of vesting installments | item 4    
Unrecognized compensation cost, net of expected forfeitures | $ $ 0.9    
Weighted-average period over which cost is expected to be recognized 2 years 8 months 12 days    
Forfeiture rate (as a percent) 0.90%    
Restricted Stock and Stock Units, Number of Shares      
Fair value of restricted shares vested | $ $ 0.6 $ 0.6 $ 0.6
Restricted stock | 2006 Incentive Plan      
Restricted Stock and Stock Units, Number of Shares      
Balance at the beginning of the period (in shares) 52,725    
Granted (in shares) 8,256    
Vested (in shares) (24,975)    
Balance at the end of the period (in shares) 36,006 52,725  
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value      
Balance at the beginning of the period (in dollars per share) | $ / shares $ 27.97    
Granted (in dollars per share) | $ / shares 54.50    
Vested (in dollars per share) | $ / shares 26.02    
Balance at the end of the period (in dollars per share) | $ / shares $ 35.41 $ 27.97  
Time-Vesting RSUs      
Additional disclosures      
Number of vesting installments | item 4    
Unrecognized compensation cost, net of expected forfeitures | $ $ 2.3    
Weighted-average period over which cost is expected to be recognized 2 years 6 months    
Forfeiture rate (as a percent) 0.90%    
Restricted Stock and Stock Units, Number of Shares      
Fair value of restricted shares vested | $ $ 1.7 $ 2.0 $ 1.9
Time-Vesting RSUs | 2006 Incentive Plan      
Restricted Stock and Stock Units, Number of Shares      
Balance at the beginning of the period (in shares) 119,820    
Granted (in shares) 21,901    
Vested (in shares) (61,258)    
Forfeited (in shares) (704)    
Balance at the end of the period (in shares) 79,759 119,820  
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value      
Balance at the beginning of the period (in dollars per share) | $ / shares $ 27.90    
Granted (in dollars per share) | $ / shares 46.90    
Vested (in dollars per share) | $ / shares 27.18    
Forfeited (in dollars per share) | $ / shares 32.53    
Balance at the end of the period (in dollars per share) | $ / shares $ 33.64 $ 27.90  
PRSU      
Additional disclosures      
Vesting period 2 years    
PRSU | Vesting in the first year following performance period      
Additional disclosures      
Vesting percentage 75.00%    
PRSU | Vesting on the fourth anniversary of date of grant      
Additional disclosures      
Vesting percentage 25.00%    
PRSU | Minimum      
Additional disclosures      
PRSUs performance measure (as a percent) 50.00%    
PRSU | Maximum      
Additional disclosures      
PRSUs performance measure (as a percent) 125.00%    
PRSU | 2006 Incentive Plan      
Restricted Stock and Stock Units, Number of Shares      
Balance at the beginning of the period (in shares) 280,595    
Granted (in shares) 18,701    
Vested (in shares) (151,276)    
Forfeited (in shares) (26,070)    
Balance at the end of the period (in shares) 121,950 280,595  
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value      
Balance at the beginning of the period (in dollars per share) | $ / shares $ 25.51    
Granted (in dollars per share) | $ / shares 47.45    
Vested (in dollars per share) | $ / shares 22.89    
Forfeited (in dollars per share) | $ / shares 21.78    
Balance at the end of the period (in dollars per share) | $ / shares $ 32.92 $ 25.51  
Additional disclosures      
Achievement percentage (as a percent) 125.00%    
1998 Employee Stock Purchase Plan (ESPP)      
Additional disclosures      
Number of shares authorized 243,000    
Purchase price as a percentage of fair market value (as a percent) 85.00%    
Offering period under the plan (in years) 1 year    
Offering period (in years) 0 years 0 years 0 years
Shares issued 0 0 0
Shares available for grant 211,777