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Summary of Significant Accounting Policies - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 24, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 5,483.7 | $ 5,324.9
Accumulated Amortization | 2,742.1 | 2,681.5
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,528.7 | 3,983.7
Accumulated Amortization | 2,186.8 | 1,991.6
In-process research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 46.0 | 3.7
Accumulated Amortization | 0.0 | 0.0
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 552.8 | 1,098.9
Accumulated Amortization | 393.8 | 546.2
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 310.3 | 236.2
Accumulated Amortization | 156.4 | 141.6
Distribution agreement |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 42.0 | 0.0
Accumulated Amortization | 2.8 | 0.0
Non-competition agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1.5 | 0.0
Accumulated Amortization | 0.1 | 0.0
Business licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 2.4 | 2.4
Accumulated Amortization | $ 2.2 | $ 2.1

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