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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 25, 2021 | Sep. 25, 2021
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 5,660.6 | $ 5,582.1
Accumulated Amortization | 4,010.1 | 3,922.9
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,656.9 | 4,597.7
Accumulated Amortization | 3,258.4 | 3,184.2
In-process research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 69.4 | 71.6
Accumulated Amortization | 0.0 | 0.0
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 612.6 | 591.7
Accumulated Amortization | 518.1 | 510.1
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 268.8 | 268.1
Accumulated Amortization | 194.6 | 191.8
Non-competition agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1.5 | 1.5
Accumulated Amortization | 1.5 | 1.5
Business licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 2.5 | 2.5
Accumulated Amortization | 2.5 | 2.5
Total acquired intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 5,611.7 | 5,533.1
Accumulated Amortization | 3,975.1 | 3,890.1
Internal-use software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 23.4 | 23.5
Accumulated Amortization | 17.9 | 17.2
Capitalized software embedded in products |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 25.5 | 25.5
Accumulated Amortization | $ 17.1 | $ 15.6

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