Income Taxes (Schedule of Significant Components of Income Taxes Related to Continuing Operations) (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Current:
Domestic	[1]	$ 0.3	$ 40.9	$ 49.3
International	[1]	95.1	17.9	12.1
Current income tax provision	[1]	95.4	58.8	61.4
Deferred:
Domestic	[1]	(0.8)	(49.7)	(18.3)
International	[1]	(187.5)	(19.2)	4.4
Deferred income tax (benefit) provision	[1]	(188.3)	(68.9)	(13.9)
Provision for (benefit from) income taxes	[1]	$ (92.9)	$ (10.1)	$ 47.5

[1] Domestic reflects U.K. in fiscal 2015, and U.S. federal and state in fiscal 2014 and fiscal 2013.