Segment Data (Schedule of Net Sales from External Customers by Products) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 26, 2014		Dec. 27, 2013
Segment Reporting Information [Line Items]
Net sales	$ 866.3		$ 540.2
Operating Segments
Segment Reporting Information [Line Items]
Net sales	857.1	[1]	528.1	[1]
Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales	373.6		59.6
Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	284.2		249.9
Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales	199.3		218.6
H. P. Acthar Gel | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales	266.4		0
Ofirmev | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales	71.4		0
Exalgo | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales	12.1		36.2
Other | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales	23.7		23.4
Other | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	42.7		31.7
Other | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales	35.9		39.5
Oxycodone (API) | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	47.0		11.6
Hydrocodone (API) | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	34.0		30.1
Methylphenidate ER (Specialty Generics) | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	48.6		56.3
Other Controlled Substances | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	111.9		120.2
Optiray (CMDS) | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales	61.5		72.1
Contrast Media and Delivery Systems | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales	97.4		111.6
Nuclear Imaging | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales	$ 101.9		$ 107.0

[1] Amounts represent sales to external customers.