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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 26, 2016	Sep. 26, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 5,326.3	$ 5,322.8
Accumulated Amortization	2,488.8	2,299.6
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	3,983.8	3,979.1
Accumulated Amortization	1,843.1	1,698.5
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	3.7	3.7
Accumulated Amortization	0.0	0.0
Customer relationships and contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,100.0	1,101.1
Accumulated Amortization	507.0	467.5
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	236.3	236.4
Accumulated Amortization	136.6	131.5
Business licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2.5	2.5
Accumulated Amortization	$ 2.1	$ 2.1

X

- Definition

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=26713463&loc=d3e16323-109275

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- Definition

Amount before 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=26713463&loc=d3e16323-109275

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