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Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 24, 2023
Sep. 25, 2022
Sep. 26, 2021
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 11.6 $ 14.4 $ 18.0
Buildings and improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life (years) 5 years    
Buildings and improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life (years) 40 years    
Printing presses and insertion equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life (years) 5 years    
Printing presses and insertion equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life (years) 25 years    
Leasehold improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life (years) 3 years    
Leasehold improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life (years) 10 years    
Other | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life (years) 3 years    
Other | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life (years) 15 years