Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plans (Details)

v3.10.0.1
Stock Incentive Plans (Details)
$ in Millions
12 Months Ended
Dec. 30, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Period
shares
Dec. 25, 2016
USD ($)
Period
Share-based compensation plan disclosures      
Total stock-based compensation cost $ 4.0 $ 4.8 $ 4.5
Income tax benefits from stock-based compensation cost 0.5 $ 1.5 $ 0.4
Total unrecognized compensation cost $ 4.8    
Number of performance periods | Period   3 1
Stock Options      
Share-based compensation plan disclosures      
Shares outstanding | shares 483,000 469,000  
Weighted average remaining vesting period 2 years 1 month 6 days    
Restricted Stock      
Share-based compensation plan disclosures      
Weighted average remaining vesting period 1 year 7 months 6 days    
Number of common shares issued per RSU or PSU | shares 1    
Restricted Stock | Board of Directors      
Share-based compensation plan disclosures      
Vesting period 1 year    
Performance Stock Units      
Share-based compensation plan disclosures      
Weighted average remaining vesting period 1 year 6 months    
Number of common shares issued per RSU or PSU | shares   1  
Performance Stock Units | Last day of annual fiscal year one      
Share-based compensation plan disclosures      
Vesting percentage 33.33%    
Performance Stock Units | Last day of annual fiscal year two      
Share-based compensation plan disclosures      
Vesting percentage 33.33%    
Performance Stock Units | Last day of annual fiscal year three      
Share-based compensation plan disclosures      
Vesting percentage 33.33%    
2017 and 2007 Performance Incentive Plans      
Share-based compensation plan disclosures      
Period following the change in control during which termination of an individual without cause will trigger vesting of award 2 years    
2017 Stock Plan      
Share-based compensation plan disclosures      
Maximum number of shares of the company's common stock that may be issued or transferred | shares 630,182    
2007 Stock Plan      
Share-based compensation plan disclosures      
Shares outstanding | shares 374,019    
2007 Stock Plan | Time Based RSUs      
Share-based compensation plan disclosures      
Vesting period 4 years    
Other stock-based compensation plans      
Share-based compensation plan disclosures      
Expiration term 10 years    
Long-Term Cash Incentive Plan | Deferred compensation, excluding share-based payments and retirement benefits      
Share-based compensation plan disclosures      
Performance and vesting period 3 years 1 year 3 years
Compensation expense $ 0.7 $ 0.4 $ 2.3
Payments of performance stock awards   0.7 $ 3.4
Long-Term Cash Incentive Plan | Deferred compensation, excluding share-based payments and retirement benefits | Accrued payroll liabilities and payroll-related liabilities      
Share-based compensation plan disclosures      
Long-term cash incentive plan liability $ 0.7 $ 0.4  
Minimum | 2007 Stock Plan      
Share-based compensation plan disclosures      
Vesting period 1 year    
Maximum | 2007 Stock Plan      
Share-based compensation plan disclosures      
Vesting period 4 years