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
 4 Months Ended
Apr. 16, 2017
Apr. 17, 2016
Stock-based compensation expense recognized    
Stock-based compensation expense $ 0.9 $ 2.1
Stock Options    
Weighted average assumptions used in estimation of fair value of options    
Risk-free interest rate (as a percent) 1.80% 1.20%
Expected years until exercise 5 years 4 years 8 months 12 days
Expected stock volatility (as a percent) 37.90% 39.30%
Dividend yield (as a percent) 0.00% 0.00%
Weighted average Black-Scholes fair value per share at date of grant (in dollars per share) $ 17.11 $ 21.93
Stock Options    
Outstanding, Beginning of period (in shares) 408  
Granted (in shares) 145  
Forfeited/expired (in shares) (13)  
Exercised/vested (in shares) (24)  
Outstanding, End of period (in shares) 516  
Restricted Stock Units    
Restricted Stock Units    
Outstanding, Beginning of period (in shares) 82  
Granted (in shares) 58  
Forfeited/expired (in shares) (3)  
Exercised/vested (in shares) (17)  
Outstanding, End of period (in shares) 120