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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 |

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