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Goodwill And Intangible Assets (Intangibles Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of acquired intangible assets $ 3,402 $ 4,671 $ 7,085 $ 9,271
Future amortization expenses, 2019 13,300   13,300  
Future amortization expenses, 2020 11,600   11,600  
Future amortization expenses, 2021 9,700   9,700  
Future amortization expenses, 2022 8,100   8,100  
Future amortization expenses, 2023 $ 7,300   $ 7,300