Income Taxes (Income Tax Provision) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Current tax expense (benefit):
Federal	$ 85.3	$ 347.7	$ 215.7
State	(0.1)	0.3	0.3
Foreign	23.5	31.2	24.4
Current Income Tax Expense	108.7	379.2	240.4
Deferred tax expense (benefit):
Federal	(0.4)	20.3	5.0
Foreign	(0.9)	14.2	1.4
Deferred Income Tax Expense	(1.3)	34.5	6.4
Provision for income taxes	$ 107.4	$ 413.7	$ 246.8