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Other Financial Information Other Financial Information (Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Sep. 28, 2018
Sep. 29, 2017
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross $ 1,156,601 $ 979,714
Accumulated depreciation and amortization (698,895) (629,803)
Property, Equipment and Improvements, net 457,706 349,911
Land    
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross 19,327 17,197
Buildings    
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross 129,336 93,313
Equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross 721,274 627,609
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross 268,979 220,295
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, equipment and improvements, gross $ 17,685 $ 21,300