Restructuring and Related Charges (Schedule of Net Restructuring and Related Charges) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 30, 2016	Dec. 25, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ 5.3	$ 4.2
Less: non-cash charges, including accelerated share-based compensation expense	(1.5)	(0.1)
Total charges expected to be settled in cash	3.8	4.1
Restructuring Fiscal 2016 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	5.2	0.0
2013 Mallinckrodt program
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	0.0	3.5
Acquisitions
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ 0.1	$ 0.7