Goodwill and Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 30, 2016	Dec. 29, 2017	Sep. 30, 2016	Sep. 25, 2015
Schedule of Intangible Asset by Major Class [Line Items]
Intangible asset amortization	$ 175.7	$ 694.5	$ 700.1	$ 550.3
Amortizable:
Finite-lived intangible assets, gross	10,322.2	10,180.1
Accumulated amortization	1,755.8	2,417.2
Non-Amortizable:
Indefinite-lived intangible assets, gross	434.1	612.1
Trademarks
Non-Amortizable:
Indefinite-lived intangible assets, gross	35.0	35.0
In-process research and development
Non-Amortizable:
Indefinite-lived intangible assets, gross	399.1	577.1
Completed Technology
Amortizable:
Finite-lived intangible assets, gross	10,028.7	9,882.8
Accumulated amortization	1,617.1	2,260.8
Licensing Agreements
Amortizable:
Finite-lived intangible assets, gross	177.1	177.1
Accumulated amortization	112.7	121.1
Customer relationships
Amortizable:
Finite-lived intangible assets, gross	27.6	29.5
Accumulated amortization	8.4	12.2
Trademarks
Amortizable:
Finite-lived intangible assets, gross	82.1	82.1
Accumulated amortization	10.9	14.5
Other
Amortizable:
Finite-lived intangible assets, gross	6.7	8.6
Accumulated amortization	$ 6.7	$ 8.6