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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 29, 2024	Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 5,305.6	$ 5,342.0
Accumulated Amortization	4,618.0	4,453.4
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,375.4	4,411.0
Accumulated Amortization	3,786.6	3,649.5
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	21.9	25.7
Accumulated Amortization	0.0	0.0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	600.6	600.0
Accumulated Amortization	564.4	550.6
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	252.5	253.6
Accumulated Amortization	222.9	212.8
Total acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,250.4	5,290.3
Accumulated Amortization	4,573.9	4,412.9
Internal-use software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	25.5	24.0
Accumulated Amortization	20.0	17.8
Capitalized software embedded in products
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	29.7	27.7
Accumulated Amortization	$ 24.1	$ 22.7

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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