Consolidated Statement of Other Comprehensive Income Statement - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Statement of Comprehensive Income [Abstract]
Net Income	$ 1,010.2	$ 995.2	$ 798.3
Other Comprehensive Income, Net of Tax
Fair value of investments	0.9	0.0	0.0
Pension adjustments	0.7	(1.8)	(0.2)
Foreign currency translation adjustment	0.8	(0.9)	(3.1)
Comprehensive income	$ 1,012.6	$ 992.5	$ 795.0