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Summary of Significant Accounting Policies - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 29, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 5,571.8	$ 5,562.5
Accumulated Amortization	3,173.2	2,790.2
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,573.3	4,528.7
Accumulated Amortization	2,505.8	2,186.8
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5.5	46.0
Accumulated Amortization	0.0	0.0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	556.5	552.8
Accumulated Amortization	428.1	393.8
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	312.5	310.3
Accumulated Amortization	175.0	156.4
Distribution agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	42.0	42.0
Accumulated Amortization	8.0	2.8
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1.5	1.5
Accumulated Amortization	0.5	0.1
Business licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2.4	2.4
Accumulated Amortization	2.2	2.2
Acquired intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,493.7	5,483.7
Accumulated Amortization	3,119.6	2,742.1
Internal-use software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	58.5	64.5
Accumulated Amortization	49.3	46.1
Capitalized software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	19.6	14.3
Accumulated Amortization	$ 4.3	$ 2.0

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Topic 350
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