Stockholders' Equity, Stock Option Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016
Number of Shares [Roll Forward]
Options outstanding, beginning of period (in shares)	11,716	11,351
Options granted (in shares)	1,820	2,805
Options exercised (in shares)	(2,562)	(2,061)
Options forfeited or cancelled (in shares)	(214)	(379)
Options outstanding, end of period (in shares)	10,760	11,716
Weighted Average Exercise Price [Roll Forward]
Options outstanding, beginning of period (in dollars per share)	$ 21.44	$ 17.71
Options granted (in dollars per share)	49.53	30.27
Options exercised (in dollars per share)	12.07	12.57
Options forfeited or cancelled (in dollars per share)	33.52	23.37
Options outstanding, end of period (in dollars per share)	28.18	21.44
Additional Information [Abstract]
Option price range at end of period, lower limit (in dollars per share)	3.04	3.04
Option price range at end of period, upper limit (in dollars per share)	$ 49.53	$ 45.62
Options exercisable at end of period (in shares)	4,108	4,573
Options available for grant at period end (in shares)	2,875	4,695
Weighted average fair value of options granted during period (in dollars per share)	$ 15.52	$ 8.68