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Other Financial Information (Property, Equipment and Improvements, Net) (Details) - USD ($)
$ in Thousands
Sep. 29, 2017
Sep. 30, 2016
Oct. 02, 2015
Property, Plant and Equipment [Line Items]      
Property, equipment and improvements, gross $ 979,714 $ 897,614  
Accumulated depreciation and amortization (629,803) (577,941)  
Property, equipment and improvements, net 349,911 319,673 $ 381,238
Land      
Property, Plant and Equipment [Line Items]      
Property, equipment and improvements, gross 17,197 16,680  
Buildings      
Property, Plant and Equipment [Line Items]      
Property, equipment and improvements, gross 93,313 91,194  
Equipment      
Property, Plant and Equipment [Line Items]      
Property, equipment and improvements, gross 627,609 531,539  
Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Property, equipment and improvements, gross 220,295 221,437  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property, equipment and improvements, gross $ 21,300 $ 36,764