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Stockholders' Equity And Stock-Based Compensation (Stock Repurchase) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 29, 2018
Mar. 30, 2018
Dec. 29, 2017
Jun. 29, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares repurchased (in shares) 896,689 77,705   1,468,278  
Payments for Repurchase of Common Stock $ 55,480     $ 90,480 $ 74,994
Repurchase of common stock   $ 5,001 $ 29,999 $ 90,480  
Average Price Paid per Share (in dollars per share) $ 61.86 $ 64.33   $ 61.86  
Stock Repurchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares repurchased (in shares)     493,884    
Average Price Paid per Share (in dollars per share)     $ 60.73