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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 26, 2020 | Sep. 26, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 4,943.9 | $ 4,931.1
Accumulated Amortization | 3,699.1 | 3,623.6
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,056.1 | 4,054.0
Accumulated Amortization | 2,969.4 | 2,907.2
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 560.5 | 549.1
Accumulated Amortization | 486.7 | 477.8
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 245.7 | 245.5
Accumulated Amortization | 183.8 | 181.2
Non-competition agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1.6 | 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 | 2.4 | 2.3
Total acquired intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,866.4 | 4,852.5
Accumulated Amortization | 3,643.8 | 3,569.8
Internal-use software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 51.9 | 51.8
Accumulated Amortization | 43.8 | 43.2
Capitalized software embedded in products |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 25.6 | 26.8
Accumulated Amortization | $ 11.5 | $ 10.6

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