Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net revenue	$ 894.3	$ 900.8	$ 2,859.6	$ 2,666.8
Cost of goods sold	442.7	447.2	1,412.5	1,323.9
Gross profit	451.6	453.6	1,447.1	1,342.9
Operating expenses:
Research and development	96.8	92.0	301.5	263.4
Selling, general and administrative	44.6	49.5	153.4	148.2
Amortization of acquisition-related intangibles	3.9	7.1	12.0	22.6
Restructuring and other charges	0.0	0.2	1.0	0.8
Total operating expenses	145.3	148.8	467.9	435.0
Operating income	306.3	304.8	979.2	907.9
Other income, net	4.5	2.0	9.5	1.4
Income before income taxes	310.8	306.8	988.7	909.3
Provision for income taxes	24.3	60.6	355.8	180.4
Net income	$ 286.5	$ 246.2	$ 632.9	$ 728.9
Earnings per share:
Basic (in dollars per share)	$ 1.58	$ 1.34	$ 3.47	$ 3.95
Diluted (in dollars per share)	$ 1.57	$ 1.32	$ 3.44	$ 3.90
Weighted average shares:
Basic (in shares)	181.2	184.2	182.3	184.6
Diluted (in shares)	182.8	186.6	184.2	187.0
Cash dividends declared and paid per share (usd per share)	$ 0.32	$ 0.28	$ 0.96	$ 0.84