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Share-Based Compensation - Restricted Shares and Other (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 30, 2017
USD ($)
item
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Jan. 02, 2016
USD ($)
shares
Additional disclosures      
Additional compensation cost for modified awards | $ $ 0.3    
2006 Incentive Plan      
Additional disclosures      
Number of shares authorized 5,274,000    
Shares available for grant 434,374    
Options      
Additional disclosures      
Fair value of options vested | $ $ 1.5 $ 1.5 $ 1.5
Unrecognized compensation cost, net of expected forfeitures | $ $ 1.7    
Weighted-average period over which cost is expected to be recognized 2 years    
Forfeiture rate (as a percent) 0.40% 0.50% 1.10%
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
Vested (in shares) (211,320) (201,905) (106,504)
Restricted stock | 2006 Incentive Plan      
Restricted Stock and Stock Units, Number of Shares      
Balance at the beginning of the period (in shares) 62,122    
Granted (in shares) 16,494    
Vested (in shares) (25,891)    
Balance at the end of the period (in shares) 52,725 62,122  
Restricted Stock and Stock Units, Weighted-Average Fair Value      
Balance at the beginning of the period (in dollars per share) | $ / shares $ 23.64    
Granted (in dollars per share) | $ / shares 36.36    
Vested (in dollars per share) | $ / shares 22.93    
Balance at the end of the period (in dollars per share) | $ / shares $ 27.97 $ 23.64  
Time-Vesting RSUs      
Additional disclosures      
Number of vesting installments | item 4    
Unrecognized compensation cost, net of expected forfeitures | $ $ 2.9    
Weighted-average period over which cost is expected to be recognized 2 years 3 months 18 days    
Forfeiture rate (as a percent) 0.90%    
Restricted Stock and Stock Units, Number of Shares      
Fair value of restricted shares vested | $ $ 2.0 $ 1.9 $ 1.8
Time-Vesting RSUs | 2006 Incentive Plan      
Restricted Stock and Stock Units, Number of Shares      
Balance at the beginning of the period (in shares) 184,751    
Granted (in shares) 25,958    
Vested (in shares) (86,547)    
Forfeited (in shares) (4,342)    
Balance at the end of the period (in shares) 119,820 184,751  
Restricted Stock and Stock Units, Weighted-Average Fair Value      
Balance at the beginning of the period (in dollars per share) | $ / shares $ 24.18    
Granted (in dollars per share) | $ / shares 38.38    
Vested (in dollars per share) | $ / shares 23.27    
Forfeited (in dollars per share) | $ / shares 24.58    
Balance at the end of the period (in dollars per share) | $ / shares $ 27.90 $ 24.18  
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) 411,153 558,159 365,468
Granted (in shares) 32,721 26,666 204,315
Vested (in shares) (98,882) (90,485)  
Forfeited (in shares) (64,397) (83,187) (11,624)
Balance at the end of the period (in shares) 280,595 411,153 558,159
Additional disclosures      
Achievement percentage (as a percent) 125.00% 125.00% 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