Restructuring and Related Charges (Schedule of Net Restructuring and Related Charges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 24, 2016	Jun. 26, 2015	Jun. 24, 2016	Jun. 26, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ 15.3	$ 22.7	$ 32.1	$ 33.6
Less: non-cash charges, including accelerated share-based compensation expense	(1.2)	(1.5)	(3.0)	(9.4)
Total charges expected to be settled in cash	14.1	21.2	29.1	24.2
2013 Mallinckrodt program
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	14.4	3.3	28.5	1.1
Acquisitions
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	0.9	19.7	3.6	32.8
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ 0.0	(0.3)	$ 0.0	(0.3)
Severance
Restructuring Cost and Reserve [Line Items]
Accelerated share-based compensation expense		$ 1.5		$ 9.2