Segment Reporting (Reconciliation of Total Segment Operating Income to Consolidated Earnings Before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 02, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 28, 2014	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ 1,227.5	$ 1,022.3	$ 864.2	$ 1,058.0	$ 969.4	$ 938.6	$ 777.5	$ 915.5	$ 4,171.9	$ 3,601.0	$ 3,081.1
Gain resulting from acquisition of joint venture									0.0	390.6	0.0
Loss on extinguishment of debt									0.0	(61.1)	0.0
Interest income and other, net									108.0	43.0	142.7
Interest expense									(81.3)	(70.5)	(64.1)
Earnings before income taxes									4,198.6	3,903.0	3,159.7
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income									5,294.1	4,521.1	3,831.1
Corporate, Non-Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income									$ (1,122.2)	$ (920.1)	$ (750.0)