CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Income Statement [Abstract]
Net sales	$ 229,234	$ 215,639	$ 233,715
Cost of sales	141,048	131,376	140,089
Gross margin	88,186	84,263	93,626
Operating expenses:
Research and development	11,581	10,045	8,067
Selling, general and administrative	15,261	14,194	14,329
Total operating expenses	26,842	24,239	22,396
Operating income	61,344	60,024	71,230
Other income/(expense), net	2,745	1,348	1,285
Income before provision for income taxes	64,089	61,372	72,515
Provision for income taxes	15,738	15,685	19,121
Net income	$ 48,351	$ 45,687	$ 53,394
Earnings per share:
Basic (in dollars per share)	$ 9.27	$ 8.35	$ 9.28
Diluted (in dollars per share)	$ 9.21	$ 8.31	$ 9.22
Shares used in computing earnings per share:
Basic (in shares)	5,217,242	5,470,820	5,753,421
Diluted (in shares)	5,251,692	5,500,281	5,793,069
Cash dividends declared per share (in dollars per share)	$ 2.4	$ 2.18	$ 1.98