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Other Financial Information Other Financial Information (Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Sep. 27, 2019
Sep. 28, 2018
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross $ 804,931 $ 712,961
Accumulated depreciation and amortization (496,788) (455,102)
Property, Equipment and Improvements, net 308,143 257,859
Land    
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross 355 1,340
Buildings    
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross 14,331 12,867
Equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross 533,804 482,783
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross 247,660 198,287
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross $ 8,781 $ 17,684