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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Jun. 27, 2015 | Sep. 27, 2014
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 5,324.3 | $ 5,325.0
Accumulated Amortization | 2,198.9 | 1,891.4
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 3,979.2 | 3,965.6
Accumulated Amortization | 1,624.6 | 1,399.4
In-process research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 3.7 | 17.9
Accumulated Amortization | 0.0 | 0.0
Customer relationships and contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1,102.4 | 1,102.4
Accumulated Amortization | 447.3 | 384.7
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 236.4 | 236.5
Accumulated Amortization | 124.9 | 105.3
Business licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 2.6 | 2.6
Accumulated Amortization | $ 2.1 | $ 2.0

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