Share Plans (Schedule of Share Option Activity) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Share Option Activity [Roll Forward]
Beginning balance	2,786,443	3,526,789
Granted	1,248,828	635,567
Exercised	(413,830)	(1,132,778)
Expired/Forfeited	(199,585)	(243,135)
Ending balance	3,421,856	2,786,443	3,526,789
Share options vested and unvested expected to vest	2,997,502
Share options exerciseable	1,388,805
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price, outstanding share options	$ 61.17	$ 52.76	$ 36.84
Weighted-average exercise price, granted share options	72.44	102.20
Weighted-average exercise price, exercised share options	32.76	29.79
Weighted-average exercise price, expired and forfeited share options	72.65	$ 58.00
Weighted-average exercise price, vested and unvested expected to vest share options	61.60
Weighted-average exercise price, exercisable share options	$ 45.55
Weighted-average remaining contractual term, outstanding share options	7 years 4 months
Weighted-average remaining contractual term, vested and unvested expected to vest share options	7 years 6 months
Weighted-average remaining contractual term, exercisable share options	5 years 4 months
Aggregate intrinsic value, outstanding share options	$ 49.6
Aggregate intrinsic value, vested and unvested expected to vest share options	42.6
Aggregate intrinsic value, exercisable share options	$ 38.2