Segment and Geographical Data (Schedule of Net Sales from External Costumers by Product) (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
Segment Reporting Information [Line Items]
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
Operating Segments
Segment Reporting Information [Line Items]
Net sales	[1]									3,298.2	2,044.6	1,655.2
Operating Segments | Specialty Generics [Member]
Segment Reporting Information [Line Items]
Net sales										1,251.6	1,199.4	1,011.2
Operating Segments | Nuclear Imaging
Segment Reporting Information [Line Items]
Net sales										423.8	431.7	437.6
Operating Segments | Specialty Brands [Member]
Segment Reporting Information [Line Items]
Net sales										1,622.8	413.5	206.4
Hydrocodone (API) and hydrocodone-containing tablets | Operating Segments | Specialty Generics [Member]
Segment Reporting Information [Line Items]
Net sales										136.5	209.6	148.3
Oxycodone (API) and oxycodone-containing tablets | Operating Segments | Specialty Generics [Member]
Segment Reporting Information [Line Items]
Net sales										154.6	155.2	139.0
Methylphenidate ER | Operating Segments | Specialty Generics [Member]
Segment Reporting Information [Line Items]
Net sales										167.2	99.4	140.0
Other controlled substances | Operating Segments | Specialty Generics [Member]
Segment Reporting Information [Line Items]
Net sales										572.2	584.5	443.3
Other | Operating Segments | Specialty Generics [Member]
Segment Reporting Information [Line Items]
Net sales										221.1	150.7	140.6
Exalgo | Operating Segments | Specialty Brands [Member]
Segment Reporting Information [Line Items]
Net sales										39.4	76.1	126.1
Ofirmev | Operating Segments | Specialty Brands [Member]
Segment Reporting Information [Line Items]
Net sales										263.0	124.4	0.0
Acthar | Operating Segments | Specialty Brands [Member]
Segment Reporting Information [Line Items]
Net sales										1,037.3	122.9	0.0
Inomax | Operating Segments | Specialty Brands [Member]
Segment Reporting Information [Line Items]
Net sales										185.2	0.0	0.0
Other | Operating Segments | Specialty Brands [Member]
Segment Reporting Information [Line Items]
Net sales										$ 97.9	$ 90.1	$ 80.3

[1] Amounts represent sales to external customers. There were no intersegment sales.