Income Taxes (Schedule of Significant Components of Income Taxes Related to Continuing Operations) (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Current:
Domestic	[1]	$ 0.3	$ 0.2	$ 22.3
International	[1]	120.5	67.3	18.9
Current income tax provision	[1]	120.8	67.5	41.2
Deferred:
Domestic	[1]	0.7	(0.8)	(41.9)
International	[1]	(377.1)	(196.0)	(11.9)
Deferred income tax (benefit)	[1]	(376.4)	(196.8)	(53.8)
Provision for (benefit from) income taxes	[1]	$ (255.6)	$ (129.3)	$ (12.6)

[1] Domestic reflects U.K. in fiscal 2016 and 2015, and U.S. federal and state in fiscal 2014.