Acquisitions and License Agreements (Schedule of Net Sales and Earnings by Acquiree) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 26, 2014	Dec. 27, 2013
Business Acquisition [Line Items]
Net sales	$ 866.3	$ 540.2
Operating income	127.4	73.1
Questcor Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Net sales	287.8
Operating income	81.2
Cadence Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Net sales	71.4
Operating income	(9.3)
Questcor and Cadence Pharmaceuticals
Business Acquisition [Line Items]
Net sales	359.2
Operating income	$ 71.9