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. 25, 2015		Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 25, 2015		Sep. 26, 2014	Sep. 27, 2013
Schedule of Net Sales and Long-Lived Assets by Geographic Area [Line Items]
Net sales		$ 882.4		$ 877.3	$ 819.0	$ 768.2	$ 673.7	$ 530.1	$ 448.7	$ 429.5	$ 3,346.9		$ 2,082.0	$ 1,712.3
Long-Lived Assets		994.7					904.0				994.7		904.0
United States
Schedule of Net Sales and Long-Lived Assets by Geographic Area [Line Items]
Net sales	[1]										2,973.2		1,780.9	1,421.6
Long-Lived Assets		905.2	[2]				829.1				905.2	[2]	829.1
EMEA
Schedule of Net Sales and Long-Lived Assets by Geographic Area [Line Items]
Net sales	[1]										236.2		250.3	250.1
Long-Lived Assets	[2],[3]	45.0					33.9				45.0		33.9
EMEA | IRELAND
Schedule of Net Sales and Long-Lived Assets by Geographic Area [Line Items]
Long-Lived Assets		10.7					0.4				10.7		0.4
Other Countries
Schedule of Net Sales and Long-Lived Assets by Geographic Area [Line Items]
Net sales	[1]										137.5		50.8	$ 40.6
Long-Lived Assets		$ 44.5					$ 41.0				$ 44.5		$ 41.0

[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 $10.7 million, and $0.4 million at the end of fiscal 2015