Annual report pursuant to Section 13 and 15(d)

Employee Benefit Programs (Details)

v3.6.0.2
Employee Benefit Programs (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended 180 Months Ended
Dec. 25, 2016
Dec. 27, 2015
Dec. 28, 2014
Dec. 25, 2016
Employee Stock Purchase Plan        
Compensation expense $ 4.5 $ 4.7 $ 4.2  
Employee Defined Contribution Plan        
Minimum age of employees to be eligible to participate in defined contribution plan 21 years      
Percentage of matching contribution 50.00% 25.00%    
Percentage of maximum compensation matched by employer 4.00% 4.00%    
Matching contribution expense $ 0.6 $ 0.3 0.3  
Employee Deferred Compensation Plan | Deferred compensation, excluding share-based payments and retirement benefits        
Employee Deferred Compensation Plan        
Deferred payment, participant limit per calendar year as a percentage of base salary 75.00%      
Deferred payment, participant limit per calendar year as a percentage of variable compensation and commissions 100.00%      
Deferred payment, maximum matching contribution percentage 4.00% 4.00%    
Deferred payment, maximum employer match 50.00% 25.00%    
Deferred compensation expense $ 0.6 $ 0.0 0.3  
Employee Deferred Compensation Plan | Deferred compensation, excluding share-based payments and retirement benefits | Other assets, net        
Employee Deferred Compensation Plan        
Deferred compensation assets 9.2 6.9   $ 9.2
Employee Deferred Compensation Plan | Deferred compensation, excluding share-based payments and retirement benefits | Other non-current liability        
Employee Deferred Compensation Plan        
Liability for participant contributions and investment income $ 9.2 $ 6.9   $ 9.2
Employee Stock Purchase Plan        
Employee Stock Purchase Plan        
Maximum percentage of base compensation that can be contributed by the eligible team members 15.00%     15.00%
Estimated subscription date fair value (as a percent) 85.00%      
Requisite employment period to be eligible to participate in the plan 1 year      
Requisite working hours per week to be eligible to participate in the plan 20 hours      
Operational period of the plan 6 months      
Number of shares outstanding 300,000     300,000
Number of shares issued under the plan 17,485     269,416
Number of shares available for future issuance under the plan 30,584     30,584
Risk-free interest rate (as a percent) 0.55% 0.46%    
Expected life 6 months 6 months    
Expected volatility (as a percent) 37.64% 39.73%    
Dividend yield (as a percent) 0.00% 0.00%    
Weighted average fair value per share at grant date (in dollars per share) $ 9.29 $ 13.37    
Compensation expense $ 0.2 $ 0.2 $ 0.2