Income Taxes (Income Tax Provision) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016
Current tax expense (benefit):
Federal	$ 347.7	$ 215.7	$ 181.8
State	0.3	0.3	0.1
Foreign	31.2	24.4	25.8
Current Income Tax Expense	379.2	240.4	207.7
Deferred tax expense (benefit):
Federal	20.3	5.0	(0.8)
Foreign	14.2	1.4	(1.5)
Deferred Income Tax Expense	34.5	6.4	(2.3)
Provision for income taxes	$ 413.7	$ 246.8	$ 205.4