Employee Stock and Benefit Plans (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Sep. 29, 2019	Sep. 29, 2019	Sep. 30, 2018	Oct. 01, 2017	Nov. 01, 2018
Dividends Payable, Date to be Paid	Nov. 29, 2019
Stock Repurchase Program, Number of Shares Authorized to be Repurchased					120.0
Maximum permitted contribution to Employee Stock Purchase Plan, percent	10.00%	10.00%
Discounted stock purchase price, percent of market value		95.00%
Number of shares issued under plan		0.4
Matching contributions		$ 122.1	$ 111.7	$ 101.4
Stock Options and Restricted Stock Units [Member]
Common stock available for issuance	52.6	52.6
Employee Stock [Member]
Common stock available for issuance	12.4	12.4
Stock Options [Member]
Award expiration period (years)		10 years
Total unrecognized stock-based compensation expense, net of estimated forfeitures	$ 5.0	$ 5.0
Weighted average recognition period for total unrecognized stock-based compensation expense (in years)		1 year 7 months 6 days
Total intrinsic value of stock options exercised		$ 466.0	236.0	181.0
Total fair value of options vested		31.0	$ 53.0	$ 40.0
Restricted Stock Units (RSUs) [Member]
Total unrecognized stock-based compensation expense, net of estimated forfeitures	$ 165.0	$ 165.0
Weighted average recognition period for total unrecognized stock-based compensation expense (in years)		2 years
Granted, weighted average grant date fair value per share		$ 68,140,000	$ 56.48	$ 54.30
Total fair value of RSUs vested		$ 255.0	$ 166.0	$ 182.0
Director [Member] | Stock Options [Member] | Maximum [Member]
Award vesting period for non-employee directors (years)		1 year