Segment Data (Schedule of Net Sales from External Customers by Products) (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
Segment Reporting Information [Line Items]
Net sales	$ 909.9		$ 557.8		$ 1,776.2		$ 1,098.0
Operating Segments
Segment Reporting Information [Line Items]
Net sales	899.7	[1]	546.7	[1]	1,756.8	[1]	1,074.8	[1]
Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales	334.3		55.1		707.9		114.7
Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	362.8		269.2		647.0		519.1
Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales	202.6		222.4		401.9		441.0
H. P. Acthar Gel | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales	228.0		0		494.4		0
Ofirmev | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales	68.1		5.3		139.5		5.3
Exalgo | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales	12.0		28.9		24.1		65.1
Other | Operating Segments | Specialty Brands
Segment Reporting Information [Line Items]
Net sales	26.2		20.9		49.9		44.3
Other | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	68.2		35.9		110.9		67.6
Other | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales	35.6		41.3		71.5		80.8
Oxycodone (API) | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	48.6		36.3		95.6		47.9
Hydrocodone (API) | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	66.6		19.7		100.6		49.8
Methylphenidate ER (Specialty Generics) | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	34.0		43.3		82.6		99.6
Other Controlled Substances | Operating Segments | Specialty Generics
Segment Reporting Information [Line Items]
Net sales	145.4		134.0		257.3		254.2
Optiray (CMDS) | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales	57.5		71.3		119.0		143.4
Contrast Media and Delivery Systems | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales	93.1		112.6		190.5		224.2
Nuclear Imaging | Operating Segments | Global Medical Imaging
Segment Reporting Information [Line Items]
Net sales	$ 109.5		$ 109.8		$ 211.4		$ 216.8

[1] Amounts represent sales to external customers.