Income Taxes (Schedule of Unrecognized Tax Benefits Balance Sheet Location) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 114.8	$ 89.2	$ 82.0	$ 100.1
Accrued and Other Current Liabilities
Income Tax Contingency [Line Items]
Unrecognized tax benefits	0.0	1.3
Other Income Tax Liabilities
Income Tax Contingency [Line Items]
Unrecognized tax benefits	55.4	80.0
Deferred income tax liability (non-current)
Income Tax Contingency [Line Items]
Unrecognized tax benefits	59.4	7.9
Liabilities, Total
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 114.8	$ 89.2