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Goodwill and Intangible Assets (Schedule of Intangible Assets Excluding Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 28, 2018 | Sep. 29, 2017
Intangible Assets Excluding Goodwill [Line Items] |  |
Gross carrying amount | $ 187.2 | $ 103.3
Accumulated amortization | (43.5) | (35.5)
Net carrying amount | $ 143.7 | 67.8
Customer Relationships [Member] |  |
Intangible Assets Excluding Goodwill [Line Items] |  |
Weighted average amortization period (years) | 3 years 4 months 24 days |
Gross carrying amount | $ 31.7 | 29.7
Accumulated amortization | (13.2) | (14.6)
Net carrying amount | $ 18.5 | 15.1
Developed Technology and Other [Member] |  |
Intangible Assets Excluding Goodwill [Line Items] |  |
Weighted average amortization period (years) | 5 years 3 months 18 days |
Gross carrying amount | $ 89.9 | 59.9
Accumulated amortization | (23.5) | (20.6)
Net carrying amount | $ 66.4 | 39.3
Trademarks [Member] |  |
Intangible Assets Excluding Goodwill [Line Items] |  |
Weighted average amortization period (years) | 3 years |
Gross carrying amount | $ 1.6 | 1.6
Accumulated amortization | (0.8) | (0.3)
Net carrying amount | $ 0.8 | 1.3
Computer Software, Intangible Asset [Member] |  |
Intangible Assets Excluding Goodwill [Line Items] |  |
Weighted average amortization period (years) | 3 years |
Gross carrying amount | $ 18.0 | 12.1
Accumulated amortization | (6.0) | 0.0
Net carrying amount | 12.0 | 12.1
In Process Research and Development [Member] |  |
Intangible Assets Excluding Goodwill [Line Items] |  |
Gross carrying amount | 46.0 | 0.0
Accumulated amortization | 0.0 | 0.0
Net carrying amount | $ 46.0 | $ 0.0

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