Segment Data (Schedule of Segment Reporting Information by Business Segment) (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 30, 2016	Dec. 25, 2015
Net sales		$ 829.9	$ 811.2
Operating income		(206.8)	162.1
Intangible asset amortization		(175.7)	(173.4)
Restructuring and related charges, net		(5.3)	(4.2)
Impairment Charges, Not Related to Restructuring Activities		214.3
Restructuring related accelerated depreciation		(1.5)	(0.1)
Specialty Brands
Restructuring and related charges, net		(2.6)	(1.6)
Specialty Generics
Restructuring and related charges, net		(0.8)	(1.1)
Operating Segments
Net sales		816.0	800.8
Operating income		369.9	384.3
Operating Segments | Specialty Brands
Net sales		603.1	543.2
Operating income		317.2	269.1
Operating Segments | Specialty Generics
Net sales		212.9	257.6
Operating income		52.7	115.2
Corporate, Non-Segment
Net sales	[1]	13.9	10.4
Corporate and allocated expenses	[2]	(181.4)	(44.6)
Intangible asset amortization		(175.7)	(173.4)
Restructuring and related charges, net	[3]	(5.3)	(4.2)
Impairment Charges, Not Related to Restructuring Activities		$ (214.3)	$ 0.0

[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, legal, environmental and other costs not charged to the Company's operating segments.

[3] Includes restructuring-related accelerated depreciation.