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Goodwill and Intangible Assets, Net (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Oct. 01, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Total amortization expense $ 0.1 $ 0.2 $ 0.2