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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 28, 2019 | Sep. 28, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 4,764.0 | $ 4,786.6
Accumulated Amortization | 3,397.0 | 3,326.8
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 3,909.3 | 3,927.7
Accumulated Amortization | 2,716.7 | 2,654.8
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 527.7 | 525.5
Accumulated Amortization | 454.5 | 447.5
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 244.7 | 245.4
Accumulated Amortization | 173.6 | 171.1
Distribution agreement |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 0.0 | 2.5
Accumulated Amortization | 0.0 | 0.0
Non-competition agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1.5 | 1.4
Accumulated Amortization | 1.0 | 0.9
Business licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 2.3 | 2.3
Accumulated Amortization | 2.2 | 2.2
Total acquired intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,685.5 | 4,704.8
Accumulated Amortization | 3,348.0 | 3,276.5
Internal-use software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 50.8 | 53.9
Accumulated Amortization | 40.9 | 43.4
Capitalized software embedded in products |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 27.7 | 27.9
Accumulated Amortization | $ 8.1 | $ 6.9

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