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Goodwill and Intangible Assets (Schedule of Intangible Assets Excluding Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 29, 2017 | Sep. 30, 2016
Intangible Assets Excluding Goodwill [Line Items] |  |
Gross carrying amount | $ 242.4 | $ 213.9
Accumulated amortization | (174.6) | (146.9)
Net carrying amount | $ 67.8 | 67.0
Customer Relationships [Member] |  |
Intangible Assets Excluding Goodwill [Line Items] |  |
Weighted average amortization period (years) | 5 years |
Gross carrying amount | $ 78.5 | 78.5
Accumulated amortization | (63.4) | (57.7)
Net carrying amount | $ 15.1 | 20.8
Developed Technology and Other [Member] |  |
Intangible Assets Excluding Goodwill [Line Items] |  |
Weighted average amortization period (years) | 5 years |
Gross carrying amount | $ 150.2 | 133.8
Accumulated amortization | (110.9) | (89.2)
Net carrying amount | $ 39.3 | 44.6
Trademarks [Member] |  |
Intangible Assets Excluding Goodwill [Line Items] |  |
Weighted average amortization period (years) | 3 years |
Gross carrying amount | $ 1.6 | 1.6
Accumulated amortization | (0.3) | 0.0
Net carrying amount | $ 1.3 | 1.6
Computer Software, Intangible Asset [Member] |  |
Intangible Assets Excluding Goodwill [Line Items] |  |
Weighted average amortization period (years) | 3 years |
Gross carrying amount | $ 12.1 | 0.0
Accumulated amortization | 0.0 | 0.0
Net carrying amount | $ 12.1 | $ 0.0

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