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Employee Stock Purchase and Stock Option Plans (Information Regarding Stock Option Plans) (Details) - $ / shares
 12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
At fiscal year end:      
Range of exercise prices for options outstanding, minimum (in dollars per share)   $ 32.51 $ 32.51
Range of exercise prices for options outstanding, maximum (in dollars per share)   $ 80.63 $ 80.63
Number of options exercisable (in shares) 1,557,900 1,992,022 2,581,421
For the fiscal year:      
Range of prices relating to options exercised, minimum (in dollars per share)   $ 37.03 $ 36.88
Range of prices relating to options exercised, maximum (in dollars per share)   55.53 55.00
Estimated weighted average fair values of options granted (in dollars per share) $ 0.00 $ 0.00 $ 12.80