Segment Data (Schedule of Segment Reporting Information by Business Segment) (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 25, 2015	Dec. 26, 2014
Net sales		$ 914.8	$ 768.2
Operating income		179.4	121.6
Intangible asset amortization		(173.4)	(124.8)
Restructuring and related charges, net		(6.4)	(7.3)
Restructuring related accelerated depreciation		(0.1)	(0.1)
Specialty Brands
Restructuring and related charges, net		(1.6)	(14.2)
Specialty Generics
Restructuring and related charges, net		(1.1)	0.0
Operating Segments
Net sales		904.4	759.7
Operating income		405.2	293.5
Operating Segments | Specialty Brands
Net sales		543.2	373.6
Operating income		272.0	148.2
Operating Segments | Specialty Generics
Net sales		257.6	284.2
Operating income		118.2	140.5
Operating Segments | Nuclear Imaging
Net sales		103.6	101.9
Operating income		15.0	4.8
Corporate, Non-Segment
Net sales	[1]	10.4	8.5
Corporate and allocated expenses	[2]	(46.0)	(39.8)
Intangible asset amortization		(173.4)	(124.8)
Restructuring and related charges, net	[3]	$ (6.4)	$ (7.3)

[1] Represents historical CMDS-related intercompany transactions that represent Mallinckrodt continuing operations under an ongoing supply agreement with the acquirer of the CMDS business.

[2] Includes administration expenses and certain compensation, environmental and other costs not charged to the Company's operating segments.

[3] Includes restructuring-related accelerated depreciation.