Acquisitions and License Agreements (Schedule of Intangible Asset Amortization by Acquiree) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 30, 2016	Dec. 29, 2017	Sep. 30, 2016	Sep. 25, 2015
Schedule of Intangible Asset Amortization by Acquiree [Line Items]
Intangible asset amortization	$ 175.7	$ 694.5	$ 700.1	$ 550.3
Ocera [Member]
Schedule of Intangible Asset Amortization by Acquiree [Line Items]
Intangible asset amortization	0.0	0.0	0.0	0.0
InfaCare [Member]
Schedule of Intangible Asset Amortization by Acquiree [Line Items]
Intangible asset amortization	0.0	0.0	0.0	0.0
Therakos
Schedule of Intangible Asset Amortization by Acquiree [Line Items]
Intangible asset amortization	19.5	61.7	78.0	0.0
Total Acquisitions
Schedule of Intangible Asset Amortization by Acquiree [Line Items]
Intangible asset amortization	50.6	186.2	202.5	57.1
Ikaria
Schedule of Intangible Asset Amortization by Acquiree [Line Items]
Intangible asset amortization	31.1	124.5	124.5	57.1
Cost of Sales
Schedule of Intangible Asset Amortization by Acquiree [Line Items]
Amortization Of Inventory Step-Up To Cost Of Sales	$ 3.6	$ 10.1	$ 24.3	$ 44.1