Acquisitions and License Agreements (Schedule of Net Sales and Earnings by Acquiree) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 27, 2015	Mar. 28, 2014	Mar. 27, 2015	Mar. 28, 2014
Business Acquisition [Line Items]
Net sales	$ 909.9	$ 557.8	$ 1,776.2	$ 1,098.0
Operating income	95.2	3.7	222.6	76.8
Questcor Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Net sales	259.5	0	547.3	0
Operating income	7.3	0	88.5	0
Cadence Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Net sales	68.1	5.3	139.5	5.3
Operating income	(32.3)	(9.0)	(41.6)	(9.0)
Questcor and Cadence Pharmaceuticals
Business Acquisition [Line Items]
Net sales	327.6	5.3	686.8	5.3
Operating income	$ (25.0)	$ (9.0)	$ 46.9	$ (9.0)