Goodwill and Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 26, 2014	Sep. 26, 2014
Schedule of Intangible Asset by Major Class [Line Items]
Finite-lived intangible assets, gross	$ 7,276.9	$ 7,278.7
Accumulated amortization	562.2	436.7
Indefinitie-lived intangible assets, gross	270.2	270.2
Trademarks
Schedule of Intangible Asset by Major Class [Line Items]
Indefinitie-lived intangible assets, gross	35.0	35.0
In-process Research and Development
Schedule of Intangible Asset by Major Class [Line Items]
Indefinitie-lived intangible assets, gross	235.2	235.2
Completed Technology
Schedule of Intangible Asset by Major Class [Line Items]
Finite-lived intangible assets, gross	7,040.1	7,040.1
Accumulated amortization	459.1	339.7
Licenses
Schedule of Intangible Asset by Major Class [Line Items]
Finite-lived intangible assets, gross	185.1	185.1
Accumulated amortization	90.4	87.3
Customer Relationships
Schedule of Intangible Asset by Major Class [Line Items]
Finite-lived intangible assets, gross	32.2	33.8
Accumulated amortization	1.7	0.6
Trademarks
Schedule of Intangible Asset by Major Class [Line Items]
Finite-lived intangible assets, gross	12.8	13.0
Accumulated amortization	4.3	4.1
Other
Schedule of Intangible Asset by Major Class [Line Items]
Finite-lived intangible assets, gross	6.7	6.7
Accumulated amortization	$ 6.7	$ 5.0