Acquisitions and License Agreements (Schedule of Financial Results and Acquisition Costs of Acquirees) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Operating Income [Abstract]
Operating income									$ 461.8	$ (75.9)	$ 73.5
Net Sales [Abstract]
Net sales	$ 882.4	$ 877.3	$ 819.0	$ 768.2	$ 673.7	$ 530.1	$ 448.7	$ 429.5	3,346.9	2,082.0	$ 1,712.3
Acquisition Related Costs										65.1
Ikaria
Operating Income [Abstract]
Operating income									47.1	0.0
Net Sales [Abstract]
Net sales									191.9	0.0
Acquisition Related Costs									30.9	0.0
Questcor Pharmaceuticals, Inc.
Operating Income [Abstract]
Operating income									223.3	17.4
Net Sales [Abstract]
Net sales									1,125.9	129.2
Acquisition Related Costs									0.0	47.5
Cadence Pharmaceuticals, Inc.
Operating Income [Abstract]
Operating income									(97.3)	(66.9)
Net Sales [Abstract]
Net sales									263.0	124.4
Acquisition Related Costs									0.0	17.6
Therakos
Net Sales [Abstract]
Acquisition Related Costs									22.5	0.0
Total Acquisitions [Member]
Operating Income [Abstract]
Operating income									173.1	(49.5)
Net Sales [Abstract]
Net sales									1,580.8	$ 253.6
Acquisition Related Costs									$ 53.4