Segment Data (Schedule of Net Sales from External Customers by Products) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Jun. 26, 2015	Jun. 27, 2014	Jun. 26, 2015	Jun. 27, 2014
Segment Reporting Information [Line Items]
Net sales		$ 965.1	$ 653.1	$ 2,741.3	$ 1,751.1
Operating Segments
Segment Reporting Information [Line Items]
Net sales	[1]	955.7	641.4	2,712.5	1,716.2
Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales		446.2	84.9	1,154.1	199.6
Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales		307.9	329.4	954.9	848.5
Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales		201.6	227.1	603.5	668.1
H. P. Acthar Gel | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales		268.7	0.0	763.1	0.0
Ofirmev | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales		62.1	53.2	201.6	58.5
Inomax | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales		81.5	0.0	81.5	0.0
Exalgo | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales		8.6	8.6	32.7	73.7
Other | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales		25.3	23.1	75.2	67.4
Other | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales		51.5	41.2	162.4	108.8
Other | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales		34.3	40.7	105.8	121.5
Oxycodone (API) | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales		31.6	53.8	127.2	101.7
Hydrocodone (API) | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales		37.4	25.3	138.0	75.1
Methylphenidate ER (Specialty Generics) | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales		30.0	54.7	112.6	154.3
Other Controlled Substances | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales		157.4	154.4	414.7	408.6
Optiray (CMDS) | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales		58.5	76.0	177.5	219.4
Contrast Media and Delivery Systems | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales		92.8	116.7	283.3	340.9
Nuclear Imaging | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales		$ 108.8	$ 110.4	$ 320.2	$ 327.2

[1] Amounts represent sales to external customers.