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Goodwill and Intangible Assets (Schedule of Intangible Assets Excluding Goodwill) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Intangible Assets Excluding Goodwill [Line Items]    
Goodwill $ 1,189.8 $ 1,189.8
Gross carrying amount 182.4 187.2
Accumulated amortization (74.5) (43.5)
Net carrying amount $ 107.9 143.7
Customer Relationships [Member]    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted average amortization period (years) 3 years 9 months 18 days  
Gross carrying amount $ 25.6 31.7
Accumulated amortization (19.5) (13.2)
Net carrying amount $ 6.1 18.5
Technology-Based Intangible Assets [Member]    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted average amortization period (years) 4 years 2 months 12 days  
Developed Technology and Other [Member]    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted average amortization period (years) 4 years 2 months 12 days  
Gross carrying amount $ 94.4 89.9
Accumulated amortization (48.9) (23.5)
Net carrying amount $ 45.5 66.4
Trademarks [Member]    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted average amortization period (years) 3 years  
Gross carrying amount $ 1.6 1.6
Accumulated amortization (1.3) (0.8)
Net carrying amount $ 0.3 0.8
Computer Software, Intangible Asset [Member]    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted average amortization period (years) 3 years  
Gross carrying amount $ 0.0 18.0
Accumulated amortization 0.0 (6.0)
Net carrying amount $ 0.0 12.0
Licensing Agreements [Member]    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted average amortization period (years) 2 years 4 months 24 days  
Gross carrying amount $ 24.9 0.0
Accumulated amortization (4.8) 0.0
Net carrying amount 20.1 0.0
In Process Research and Development [Member]    
Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 35.9 46.0
Accumulated amortization 0.0 0.0
Net carrying amount $ 35.9 $ 46.0
Trade Names [Member]    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted average amortization period (years) 3 years