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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 29, 2019	Sep. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 5,239.9	$ 5,571.8
Accumulated Amortization	3,452.0	3,173.2
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,288.5	4,573.3
Accumulated Amortization	2,745.1	2,505.8
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	11.4	5.5
Accumulated Amortization	0.0	0.0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	546.0	556.5
Accumulated Amortization	451.7	428.1
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	283.7	312.5
Accumulated Amortization	188.4	175.0
Distribution agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	24.2	42.0
Accumulated Amortization	11.2	8.0
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1.5	1.5
Accumulated Amortization	0.8	0.5
Business licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2.4	2.4
Accumulated Amortization	2.2	2.2
Total acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,157.7	5,493.7
Accumulated Amortization	3,399.4	3,119.6
Internal-use software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	56.0	58.5
Accumulated Amortization	46.4	49.3
Capitalized software embedded in products
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	26.2	19.6
Accumulated Amortization	$ 6.2	$ 4.3

X

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

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

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-Name Accounting Standards Codification
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