Stockholders' Equity And Stock-Based Compensation (Stock Repurchase) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 29, 2017	Sep. 30, 2016	Sep. 25, 2015	Jan. 25, 2017	Oct. 31, 2014	Feb. 29, 2012	Jul. 31, 2011	Jul. 31, 2010	Nov. 30, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount	$ 1,300,000				$ 1,300,000								$ 250,000
Shares repurchased (in shares)	488,909	485,179	519,917	531,465	2,025,470
Cost	$ 25,006	$ 24,994	$ 24,999	$ 25,001	$ 100,000	$ 100,854	$ 107,349
Average Price Paid per Share (in dollars per share)	$ 51.13	$ 51.50	$ 48.07	$ 47.02	$ 51.13
Additional Stock Approved [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount								$ 200,000	$ 200,000	$ 100,000	$ 250,000	$ 300,000