Shareholders' Equity - Shares of Common Stock (Details) - shares shares in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock outstanding, beginning balances (in shares)	4,754,986
Common stock repurchased (in shares)	(345,200)
Common stock outstanding, ending balances (in shares)	4,443,236	4,754,986
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock outstanding, beginning balances (in shares)	4,754,986	5,126,201	5,336,166
Common stock repurchased (in shares)	(345,205)	(405,549)	(246,496)
Common stock issued, net of shares withheld for employee taxes (in shares)	33,455	34,334	36,531
Common stock outstanding, ending balances (in shares)	4,443,236	4,754,986	5,126,201