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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Jun. 26, 2021 | Sep. 26, 2020
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 5,660.0 | $ 4,931.1
Accumulated Amortization | 3,859.2 | 3,623.6
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,604.5 | 4,054.0
Accumulated Amortization | 3,102.4 | 2,907.2
In-process research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 102.5 | 0.0
Accumulated Amortization | 0.0 | 0.0
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 598.0 | 549.1
Accumulated Amortization | 502.1 | 477.8
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 269.6 | 245.5
Accumulated Amortization | 188.8 | 181.2
Non-competition agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1.6 | 1.5
Accumulated Amortization | 1.6 | 1.3
Business licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 2.5 | 2.4
Accumulated Amortization | 2.5 | 2.3
Total acquired intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 5,578.7 | 4,852.5
Accumulated Amortization | 3,797.4 | 3,569.8
Internal-use software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 55.4 | 51.8
Accumulated Amortization | 47.6 | 43.2
Capitalized software embedded in products |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 25.9 | 26.8
Accumulated Amortization | $ 14.2 | $ 10.6

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