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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 29, 2018 | Sep. 29, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 5,669.3 | $ 5,571.8
Accumulated Amortization | 3,267.1 | 3,173.2
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,656.2 | 4,573.3
Accumulated Amortization | 2,586.3 | 2,505.8
In-process research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 16.9 | 5.5
Accumulated Amortization | 0.0 | 0.0
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 556.0 | 556.5
Accumulated Amortization | 435.9 | 428.1
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 315.1 | 312.5
Accumulated Amortization | 179.8 | 175.0
Distribution agreement |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 42.0 | 42.0
Accumulated Amortization | 9.3 | 8.0
Non-competition agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1.5 | 1.5
Accumulated Amortization | 0.6 | 0.5
Business licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 2.4 | 2.4
Accumulated Amortization | 2.2 | 2.2
Total acquired intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 5,590.1 | 5,493.7
Accumulated Amortization | 3,214.1 | 3,119.6
Internal-use software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 56.8 | 58.5
Accumulated Amortization | 48.1 | 49.3
Capitalized software embedded in products |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 22.4 | 19.6
Accumulated Amortization | $ 4.9 | $ 4.3

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