Segment and Geographical Data (Schedule of Net Sales and Long-Lived Assets by Geographic Area) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Sep. 30, 2016	Jun. 24, 2016	Mar. 25, 2016	Dec. 25, 2015	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Schedule of Net Sales and Long-Lived Assets by Geographic Area [Line Items]
Net sales		$ 887.2	$ 866.6	$ 815.8	$ 811.2	$ 778.8	$ 768.5	$ 709.5	$ 666.3	$ 3,380.8	$ 2,923.1	$ 1,650.3
Long-Lived Assets		856.1				805.7				856.1	805.7
United States
Schedule of Net Sales and Long-Lived Assets by Geographic Area [Line Items]
Net sales	[1]									3,095.4	2,647.0	1,485.0
Long-Lived Assets	[2]	742.4				747.8				742.4	747.8
EMEA
Schedule of Net Sales and Long-Lived Assets by Geographic Area [Line Items]
Net sales	[1]									211.8	159.0	140.8
Long-Lived Assets	[2],[3]	61.2				13.4				61.2	13.4
EMEA | IRELAND
Schedule of Net Sales and Long-Lived Assets by Geographic Area [Line Items]
Long-Lived Assets		59.3				10.7				59.3	10.7
Other Countries
Schedule of Net Sales and Long-Lived Assets by Geographic Area [Line Items]
Net sales	[1]									73.6	117.1	$ 24.5
Long-Lived Assets	[2]	$ 52.5				$ 44.5				$ 52.5	$ 44.5

[1] Net sales are attributed to regions based on the location of the entity that records the transaction, none of which relate to the country of Ireland.

[2] Long-lived assets are primarily composed of property, plant and equipment.

[3] Includes long-lived assets located in Ireland of $59.3 million, and $10.7 million at the end of fiscal 201