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Employee Stock Purchase and Stock Option Plans (Stock Option Activity Under the 1999 Plans and the 1981 Plan) (Details) - $ / shares
 12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of stock options outstanding, beginning balance (in shares) 2,516,825 3,577,512 4,072,707
Number of stock options, Granted (in shares) 0 0 460,770
Number of stock options, Exercised (in shares) (636,019) (906,648) (412,416)
Number of stock options, Canceled or expired (in shares) (114,047) (154,039) (543,549)
Number of stock options outstanding, ending balance (in shares) 1,766,759 2,516,825 3,577,512
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Weighted Average Exercise Price, beginning balance (in dollars per share) $ 46.19 $ 45.69 $ 46.06
Weighted Average Exercise Price, Granted (in dollars per share) 0.00 0.00 42.17
Weighted Average Exercise Price, Exercised (in dollars per share) 46.93 43.79 40.88
Weighted Average Exercise Price, Canceled or expired (in dollars per share) 52.26 48.79 49.13
Weighted Average Exercise Price, ending balance (in dollars per share) $ 45.53 $ 46.19 $ 45.69