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Goodwill And Intangible Assets (Intangibles Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization of acquired intangible assets $ 3,683 $ 4,600
Future amortization expenses, 2019 13,100  
Future amortization expenses, 2020 11,400  
Future amortization expenses, 2021 9,500  
Future amortization expenses, 2022 8,000  
Future amortization expenses, 2023 $ 7,200