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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 26, 2015 | Sep. 26, 2015
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 5,321.8 | $ 5,322.8
Accumulated Amortization | 2,395.1 | 2,299.6
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 3,979.0 | 3,979.1
Accumulated Amortization | 1,771.8 | 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 | 1,100.3 | 1,101.1
Accumulated Amortization | 487.2 | 467.5
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 236.3 | 236.4
Accumulated Amortization | 134.0 | 131.5
Business licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 2.5 | 2.5
Accumulated Amortization | $ 2.1 | $ 2.1

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- 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 + Details
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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 + Details
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