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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Mar. 27, 2021 | Sep. 26, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 5,224.9 | $ 4,931.1
Accumulated Amortization | 3,777.3 | 3,623.6
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,320.3 | 4,054.0
Accumulated Amortization | 3,033.9 | 2,907.2
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 570.9 | 549.1
Accumulated Amortization | 493.9 | 477.8
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 248.6 | 245.5
Accumulated Amortization | 186.2 | 181.2
Non-competition agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1.5 | 1.5
Accumulated Amortization | 1.5 | 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 | 5,143.8 | 4,852.5
Accumulated Amortization | 3,718.0 | 3,569.8
Internal-use software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 55.2 | 51.8
Accumulated Amortization | 46.8 | 43.2
Capitalized software embedded in products |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 25.9 | 26.8
Accumulated Amortization | $ 12.5 | $ 10.6

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