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Summary of Significant Accounting Policies (Property, Fixtures and Equipment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 25, 2022
Dec. 26, 2021
Property, Plant and Equipment [Line Items]      
Capitalized internal costs for construction in progress $ 5.4 $ 4.1 $ 3.7
Capitalized computer equipment and software, additions 12.4 9.2  
Property, fixtures and equipment, net      
Property, Plant and Equipment [Line Items]      
Capitalized computer equipment and software, net $ 14.3 $ 10.1  
Buildings | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life [1] 5 years    
Buildings | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life [1] 30 years    
Furniture and fixtures | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 5 years    
Furniture and fixtures | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 7 years    
Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 2 years    
Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 7 years    
Computer equipment and software | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 2 years    
Computer equipment and software | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 7 years    
[1] Includes improvements to leased properties which are depreciated over the shorter of their useful life or the reasonably certain lease term, including renewal periods that are reasonably certain.