Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 03, 2016	Mar. 29, 2015	Apr. 03, 2016	Mar. 29, 2015	Apr. 03, 2016	Sep. 27, 2015
Goodwill and Intangible Assets Disclosure [Line Items]
Amortizable intangible assets					$ 781,700	$ 357,800
Goodwill	$ 2,464,600		$ 1,139,300		2,464,600	1,139,300
Goodwill [Roll Forward]
Balance as of September 27, 2015			1,139,300
Additions from acquisition			1,430,800
Reclassifications to assets held for sale			(103,900)
Adjustments from prior acquisition			(1,600)
Balance as of April 3, 2016	2,464,600		2,464,600
Amortization of intangible assets	45,300	$ 22,700	70,685	$ 46,273
Completed technology
Goodwill and Intangible Assets Disclosure [Line Items]
Amortizable intangible assets					636,300	238,000
Goodwill [Roll Forward]
Amortization of intangible assets	30,300	11,400	44,557	22,864
Customer relationships
Goodwill and Intangible Assets Disclosure [Line Items]
Amortizable intangible assets					136,200	119,100
Goodwill [Roll Forward]
Amortization of intangible assets	12,000	11,200	22,956	22,433
Backlog, trade name and other
Goodwill and Intangible Assets Disclosure [Line Items]
Amortizable intangible assets					9,200	700
Goodwill [Roll Forward]
Amortization of intangible assets	$ 3,000	$ 100	$ 3,172	$ 976
In-process research and development
Goodwill and Intangible Assets Disclosure [Line Items]
Non-amortizable intangible assets					$ 241,000	$ 0