Share Plans (Schedule of Share Option Activity) (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jun. 28, 2013	Sep. 25, 2015	Sep. 26, 2014	Jun. 27, 2014	Sep. 27, 2013
Share Option Activity [Roll Forward]
Beginning balance		3,526,789	2,760,231
Granted		635,567	675,921
Converted from Questcor Acquisition			1,292,736
Exercised		(1,132,778)	(878,330)
Expired/Forfeited		(243,135)	(323,769)
Ending balance		2,786,443	3,526,789
Share options vested and unvested expected to vest		2,649,351
Share options exerciseable		1,054,336		550,097
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price, outstanding share options		$ 52.76	$ 36.84	$ 35.94	$ 37.30
Weighted-average exercise price, granted share options		102.20	52.63
Weighted-average exercise price, converted from Questcor acquisition, share options			25.08
Weighted-average exercise price, exercised share options		29.79	30.96
Weighted-average exercise price, expired and forfeited share options		58.00	$ 41.83
Weighted-average exercise price, vested and unvested expected to vest share options		50.94
Weighted-average exercise price, exercisable share options		$ 34.20		$ 30.94
Weighted-average remaining contractual term, outstanding share options	8 years	7 years 4 months
Weighted-average remaining contractual term, vested and unvested expected to vest share options		7 years 5 months
Weighted-average remaining contractual term, exercisable share options	5 years 11 months	5 years 9 months
Aggregate intrinsic value, outstanding share options		$ 63.2		$ 22.9
Aggregate intrinsic value, vested and unvested expected to vest share options		59.0
Aggregate intrinsic value, exercisable share options		$ 36.2		$ 8.0