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Share-Based Compensation - Restricted Shares and Other (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 02, 2021
USD ($)
installment
$ / shares
shares
Dec. 28, 2019
USD ($)
$ / shares
shares
Dec. 29, 2018
USD ($)
shares
2006 Incentive Plan      
Additional disclosures      
Shares available for grant 454,497    
Options      
Additional disclosures      
Fair value of options vested | $ $ 0.2 $ 0.7 $ 1.1
Unrecognized compensation cost, net of expected forfeitures | $ $ 0.3    
Weighted-average period over which cost is expected to be recognized 1 year 8 months 12 days    
Forfeiture rate (as a percent)     0.40%
Restricted stock      
Additional disclosures      
Number of vesting installments | installment 4    
Unrecognized compensation cost, net of expected forfeitures | $ $ 0.9    
Weighted-average period over which cost is expected to be recognized 2 years 10 months 24 days    
Forfeiture rate (as a percent) 0.90%    
Restricted Stock and Stock Units, Number of Shares      
Fair value of restricted shares vested | $ $ 0.5 $ 0.5 $ 0.6
Restricted stock | 2006 Incentive Plan      
Restricted Stock and Stock Units, Number of Shares      
Balance at the beginning of the period (in shares) 31,523    
Granted (in shares) 16,454    
Vested (in shares) (14,437)    
Forfeited (in shares) 0    
Balance at the end of the period (in shares) 33,540 31,523  
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value      
Balance at the beginning of the period (in dollars per share) | $ / shares $ 38.66    
Granted (in dollars per share) | $ / shares 36.46    
Vested (in dollars per share) | $ / shares 34.78    
Forfeited (in dollars per share) | $ / shares 0    
Balance at the end of the period (in dollars per share) | $ / shares $ 38.73 $ 38.66  
Time-Vesting RSUs      
Additional disclosures      
Number of vesting installments | installment 4    
Unrecognized compensation cost, net of expected forfeitures | $ $ 3.3    
Weighted-average period over which cost is expected to be recognized 3 years 2 months 12 days    
Forfeiture rate (as a percent) 0.90%    
Restricted Stock and Stock Units, Number of Shares      
Fair value of restricted shares vested | $ $ 1.0 $ 1.3 $ 1.7
Time-Vesting RSUs | 2006 Incentive Plan      
Restricted Stock and Stock Units, Number of Shares      
Balance at the beginning of the period (in shares) 64,638    
Granted (in shares) 43,334    
Vested (in shares) (22,983)    
Forfeited (in shares) 0    
Balance at the end of the period (in shares) 84,989 64,638  
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value      
Balance at the beginning of the period (in dollars per share) | $ / shares $ 43.87    
Granted (in dollars per share) | $ / shares 46.75    
Vested (in dollars per share) | $ / shares 41.68    
Forfeited (in dollars per share) | $ / shares 0    
Balance at the end of the period (in dollars per share) | $ / shares $ 45.93 $ 43.87  
PRSU      
Additional disclosures      
Vesting period (in years) 2 years    
PRSU | Vesting on the fourth anniversary of date of grant      
Additional disclosures      
Vesting percentage 25.00%    
PRSU | Vesting in the first year following performance period      
Additional disclosures      
Vesting percentage 75.00%    
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) 82,150    
Granted (in shares) 33,621    
Vested (in shares) (23,976)    
Forfeited (in shares) (1,215)    
Balance at the end of the period (in shares) 90,580 82,150  
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value      
Balance at the beginning of the period (in dollars per share) | $ / shares $ 45.88    
Granted (in dollars per share) | $ / shares 52.98    
Vested (in dollars per share) | $ / shares 39.71    
Forfeited (in dollars per share) | $ / shares 44.87    
Balance at the end of the period (in dollars per share) | $ / shares $ 50.06 $ 45.88  
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    
Shares issued 0 0 0
Shares available for grant 211,777