Annual report pursuant to Section 13 and 15(d)

Description of Business and Summary of Significant Accounting Policies (Details 3)

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Description of Business and Summary of Significant Accounting Policies (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Dec. 25, 2016
Property and equipment      
Capitalized interest $ 0.2 $ 0.3 $ 0.2
Buildings | Minimum      
Property and equipment      
Estimated useful lives 5 years    
Buildings | Maximum      
Property and equipment      
Estimated useful lives 20 years    
Leasehold improvements | Maximum      
Property and equipment      
Estimated useful lives 20 years    
Furniture, fixtures and equipment | Minimum      
Property and equipment      
Estimated useful lives 5 years    
Furniture, fixtures and equipment | Maximum      
Property and equipment      
Estimated useful lives 20 years    
Computer equipment | Minimum      
Property and equipment      
Estimated useful lives 2 years    
Computer equipment | Maximum      
Property and equipment      
Estimated useful lives 5 years