Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 28, 2018		Sep. 29, 2017		Sep. 30, 2016
Income Statement [Abstract]
Net revenue	$ 3,868.0		$ 3,651.4		$ 3,289.0
Cost of goods sold	1,917.3		1,809.6		1,623.8
Gross profit	1,950.7		1,841.8		1,665.2
Operating expenses:
Research and development	404.5		355.2		312.4
Selling, general and administrative	207.8		204.6		195.9
Amortization of intangibles	18.3		27.6		33.4
Restructuring and other charges	0.8		0.6		4.8
Total operating expenses	631.4		588.0		546.5
Operating income	1,319.3		1,253.8		1,118.7
Other income (expense), net	12.8		3.2		(6.6)
Merger termination fee	0.0		0.0		88.5
Income before income taxes	1,332.1		1,257.0		1,200.6
Provision for income taxes	413.7		246.8		205.4
Net income	$ 918.4		$ 1,010.2		$ 995.2
Earnings per share:
Basic (in dollars per share)	$ 5.06	[1]	$ 5.48	[1]	$ 5.27
Diluted (in dollars per share)	$ 5.01	[1]	$ 5.41	[1]	$ 5.18
Weighted average shares:
Basic (in shares)	181.3		184.3		188.7
Diluted (in shares)	183.2		186.7		192.1
Cash dividends declared and paid per share (in dollars per share)	$ 1.34		$ 1.16		$ 1.06

[1] Earnings per share calculations for each of the quarters are based on the weighted average number of shares outstanding and included common stock equivalents in each period. Therefore, the sums of the quarters do not necessarily equal the full year earnings per share.