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. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 27, 2015	Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ 1,022.5	$ 1,044.2	$ 935.4	$ 1,132.6	$ 1,227.5	$ 1,022.3	$ 864.2	$ 1,058.0	$ 4,134.7	$ 4,171.9	$ 3,601.0
Gain resulting from acquisition of joint venture									0.0	0.0	390.6
Loss on extinguishment of debt									0.0	0.0	(61.1)
Interest income and other, net									275.3	108.0	43.0
Interest expense									(92.5)	(81.3)	(70.5)
Earnings before income taxes									4,317.5	4,198.6	3,903.0
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income									5,263.4	5,294.1	4,521.1
Corporate, Non-Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income									$ (1,128.7)	$ (1,122.2)	$ (920.1)