Quarterly report pursuant to Section 13 or 15(d)

Stock Incentive Plans - Summary of Fair Value Assumptions and Stock-Based Compensation Activity (Details)

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Stock Incentive Plans - Summary of Fair Value Assumptions and Stock-Based Compensation Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jul. 10, 2016
Jul. 12, 2015
Jul. 10, 2016
Jul. 12, 2015
Stock-based compensation expense recognized        
Stock-based compensation expense $ 1.0 $ 1.4 $ 3.1 $ 2.8
Stock Options        
Weighted average assumptions used in estimation of fair value of options        
Risk-free interest rate (as a percent) 1.10% 1.60% 1.20% 1.40%
Expected years until exercise 4 years 3 months 18 days 4 years 9 months 18 days 4 years 8 months 12 days 4 years 9 months 18 days
Expected stock volatility (as a percent) 37.20% 39.40% 39.20% 40.60%
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%
Weighted average Black-Scholes fair value per share at date of grant (in dollars per share) $ 19.56 $ 30.86 $ 21.81 $ 29.71
Stock Options        
Outstanding, Beginning of period (in shares)     395  
Granted (in shares)     132  
Forfeited/expired (in shares)     (15)  
Exercised/vested (in shares)     (7)  
Outstanding, End of period (in shares) 505   505  
Restricted Stock Units        
Restricted Stock Units        
Outstanding, Beginning of period (in shares)     75  
Granted (in shares)     55  
Forfeited/expired (in shares)     (5)  
Exercised/vested (in shares)     (36)  
Outstanding, End of period (in shares) 89   89