Intangible Assets Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 26, 2016	Jun. 25, 2016	Sep. 26, 2015
Product Line [Line Items]
Accumulated Amortization		$ 2,588.2	$ 2,299.6
Indefinite-lived Intangible Assets Acquired	$ 4.8
Developed technology
Product Line [Line Items]
Accumulated Amortization		1,920.4	$ 1,698.5
Cystic Fibrosis [Member] | Developed technology
Product Line [Line Items]
Accumulated Amortization		$ 6.2