Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plans (Details)

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Stock Incentive Plans (Details)
$ in Millions
1 Months Ended 12 Months Ended
May 31, 2019
shares
Dec. 29, 2019
USD ($)
shares
Dec. 30, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Period
shares
Dec. 25, 2016
Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation cost | $   $ 3.3 $ 4.0 $ 4.8  
Income tax benefits from stock-based compensation cost | $   0.3 $ 0.5 $ 1.5  
Total unrecognized compensation cost | $   $ 5.9      
Number of performance periods | Period       3 1
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding   288,000 483,000    
Weighted average remaining vesting period   10 months 17 days      
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average remaining vesting period   1 year 9 months 8 days      
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average remaining vesting period   1 year 9 months 22 days      
Number of common shares issued per RSU or PSU (in shares)       1  
Amended 2017 Performance Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares of the company's common stock that may be issued or transferred (in shares)   630,182      
2017 and 2007 Performance Incentive Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Period following the change in control during which termination of an individual without cause will trigger vesting of award     2 years    
Other Stock Based Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration Term     10 years    
2017 Stock Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares of the company's common stock that may be issued or transferred (in shares)   1,290,182      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 660,000        
2007 Stock Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding     242,579    
Long-term cash incentive plan | Deferred compensation, excluding share-based payments and retirement benefits          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance and vesting period     3 years 1 year 3 years
Compensation expense | $   $ 0.2 $ 0.7 $ 0.4  
Long-term cash incentive plan | Deferred compensation, excluding share-based payments and retirement benefits | Accrued payroll liabilities and payroll-related liabilities          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Long-term cash incentive plan liability | $   $ 1.1 $ 0.7    
Minimum | 2007 Stock Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
Maximum | 2007 Stock Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years    
Share-based Payment Arrangement, Employee | 2007 Stock Plan | Time Based RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years    
Share-based Payment Arrangement, Nonemployee | 2007 Stock Plan | Time Based RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year