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Commitments And Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Commitments and Contingencies Disclosure [Abstract]      
Rent expense under operating leases $ 25,257 $ 28,279 $ 27,764
Future minimum rental payments, 2018 21,878    
Future minimum rental payments, 2019 19,644    
Future minimum rental payments, 2020 15,596    
Future minimum rental payments, 2021 12,697    
Future minimum rental payments, 2022 9,934    
Future minimum rental payments, thereafter 44,203    
Contingently liable for standby letters of credit issued 24,708    
Long-term Purchase Commitment [Line Items]      
Purchase Obligation 755,735    
Property, Plant and Equipment      
Long-term Purchase Commitment [Line Items]      
Purchase Obligation $ 16,527