Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Income Statement [Abstract]
Net revenue	$ 900.8	$ 751.7	$ 2,666.8	$ 2,453.6
Cost of goods sold	447.2	373.4	1,323.9	1,212.8
Gross profit	453.6	378.3	1,342.9	1,240.8
Operating expenses:
Research and development	92.0	77.9	263.4	239.2
Selling, general and administrative	49.5	46.9	148.2	142.6
Amortization of intangibles	7.1	10.0	22.6	27.0
Restructuring and other charges	0.2	4.9	0.8	5.2
Total operating expenses	148.8	139.7	435.0	414.0
Operating income	304.8	238.6	907.9	826.8
Other income (expense), net	2.0	(2.4)	1.4	(5.8)
Merger termination fee	0.0	0.0	0.0	88.5
Income before income taxes	306.8	236.2	909.3	909.5
Provision for income taxes	60.6	51.2	180.4	161.1
Net income	$ 246.2	$ 185.0	$ 728.9	$ 748.4
Earnings per share:
Basic (in dollars per share)	$ 1.34	$ 0.98	$ 3.95	$ 3.94
Diluted (in dollars per share)	$ 1.32	$ 0.97	$ 3.90	$ 3.87
Weighted average shares:
Basic (in shares)	184.2	188.7	184.6	189.8
Diluted (in shares)	186.6	191.7	187.0	193.2
Cash dividends declared and paid per share (usd per share)	$ 0.28	$ 0.26	$ 0.84	$ 0.78