Annual report pursuant to Section 13 and 15(d)

Employee Benefit Programs (Details)

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Employee Benefit Programs (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2017
Hour
shares
Dec. 29, 2019
USD ($)
$ / shares
shares
Dec. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
Employee Stock Purchase Plan        
Compensation expense   $ 3.3 $ 4.0 $ 4.8
Employee Defined Contribution Plan        
Minimum age of employees to be eligible to participate in defined contribution plan     21 years  
Percentage of matching contribution   100.00% 50.00% 50.00%
Percentage of maximum compensation matched by employer   3.00% 2.00% 4.00%
Matching contribution expense   $ 3.0 $ 0.9 $ 0.7
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 employer match     50.00%  
Deferred payment, maximum matching contribution percentage     4.00%  
Deferred compensation expense   1.1   1.0
Employee Deferred Compensation Plan | Deferred compensation, excluding share-based payments and retirement benefits | Other assets, net        
Employee Deferred Compensation Plan        
Deferred compensation assets   7.3 $ 8.2  
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   $ 7.3 $ 8.2  
Amended And Restated Employee Stock Purchase Plan        
Employee Stock Purchase Plan        
Number of shares outstanding (in shares) | shares 100,000      
Maximum percentage of base compensation that can be contributed by the eligible team members 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 | Hour 20      
Operational period of the plan 6 months      
Number of shares issued under the plan (in shares) | shares   29,582 10,360  
Number of shares available for future issuance under the plan (in shares) | shares   52,451    
Risk-free interest rate (as a percent)   1.51% 2.05%  
Expected life   6 months 6 months  
Expected volatility (as a percent)   41.82% 39.92%  
Dividend yield (as a percent)   0.00% 0.00%  
Weighted average fair value per share at grant date (in dollars per share) | $ / shares   $ 7.56 $ 5.19  
Compensation expense   $ 0.2 $ 0.1 $ 0.2