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Goodwill and Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 29, 2019
Sep. 28, 2018
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets, Gross Carrying Amount $ 200.1 $ 187.2
Total intangible assets, Accumulated Amortization (70.2) (43.5)
Total intangible assets, Net Carrying Amount $ 129.9 143.7
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 3 years 5 months 9 days  
Finite-Lived Intangible Assets, Gross $ 31.7 31.7
Accumulated Amortization (20.9) (13.2)
Net Carrying Amount $ 10.8 18.5
Developed technology and other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 4 years 3 months 26 days  
Finite-Lived Intangible Assets, Gross $ 89.9 89.9
Accumulated Amortization (38.1) (23.5)
Net Carrying Amount $ 51.8 66.4
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 3 years  
Finite-Lived Intangible Assets, Gross $ 1.6 1.6
Accumulated Amortization (1.0) (0.8)
Net Carrying Amount $ 0.6 0.8
Computer Software, Intangible Asset [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 2 years 10 months 6 days  
Finite-Lived Intangible Assets, Gross $ 30.9 18.0
Accumulated Amortization (10.2) (6.0)
Net Carrying Amount $ 20.7 12.0
In Process Research and Development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Amortization Period (Years) 0 years  
Finite-Lived Intangible Assets, Gross $ 46.0 46.0
Accumulated Amortization 0.0 0.0
Net Carrying Amount $ 46.0 $ 46.0