Consolidated Statements Of Operations - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Income Statement [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,355,700	$ 3,376,800	$ 3,868,000
Cost of Goods and Services Sold	1,742,800	1,773,000	1,917,300
Gross profit	1,612,900	1,603,800	1,950,700
Operating expenses:
Research and development	464,100	424,100	404,500
Selling, general and administrative	231,400	198,300	207,800
Amortization of intangibles	11,800	22,600	18,300
Restructuring and other charges	13,800	6,800	800
Total operating expenses	721,100	651,800	631,400
Operating income	891,800	952,000	1,319,300
Other income (expense), net	(100)	9,000	12,800
Income before income taxes	891,700	961,000	1,332,100
Provision for income taxes	76,900	107,400	413,700
Net income	$ 814,800	$ 853,600	$ 918,400
Earnings per share:
Basic (in dollars per share)	$ 4.84	$ 4.92	$ 5.06
Diluted (in dollars per share)	$ 4.80	$ 4.89	$ 5.01
Weighted average shares:
Basic (in shares)	168.5	173.5	181.3
Diluted (in shares)	169.9	174.5	183.2
Cash dividends declared and paid per share (in dollars per share)	$ 1.82	$ 1.58	$ 1.34