Restructuring and Related Charges (Schedule of Net Restructuring and Related Charges) (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
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ 3.8	$ 21.7	$ 11.1	$ 29.8
Less: non-cash charges, including accelerated share-based compensation expense	(1.0)	(2.6)	(7.9)	(2.7)
Total charges expected to be settled in cash	2.8	19.1	3.2	27.1
2013 Mallinckrodt program
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	2.9	22.6	(2.0)	30.9
Acquisitions
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	0.9	(0.4)	13.1	(0.4)
Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ 0	$ (0.5)	$ 0	$ (0.7)