Intangible Assets - Schedule of Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 28, 2015
Sep. 27, 2014
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 5,324.5 $ 5,325.0
Accumulated Amortization 2,098.7 1,891.4
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 3,979.6 3,965.6
Accumulated Amortization 1,551.9 1,399.4
In-process research and development    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 3.7 17.9
Accumulated Amortization 0 0
Customer relationships and contracts    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 1,102.2 1,102.4
Accumulated Amortization 426.4 384.7
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 236.4 236.5
Accumulated Amortization 118.3 105.3
Business licenses    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 2.6 2.6
Accumulated Amortization $ 2.1 $ 2.0