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Summary of Significant Accounting Policies - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 24, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 5,483.7	$ 5,324.9
Accumulated Amortization	2,742.1	2,681.5
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,528.7	3,983.7
Accumulated Amortization	2,186.8	1,991.6
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	46.0	3.7
Accumulated Amortization	0.0	0.0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	552.8	1,098.9
Accumulated Amortization	393.8	546.2
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	310.3	236.2
Accumulated Amortization	156.4	141.6
Distribution agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	42.0	0.0
Accumulated Amortization	2.8	0.0
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1.5	0.0
Accumulated Amortization	0.1	0.0
Business licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2.4	2.4
Accumulated Amortization	$ 2.2	$ 2.1

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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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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
-Topic 350
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-Section 50
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