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Employee Stock Purchase and Stock Option Plans (Total Intrinsic Value of Options Exercised) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Share-based Payment Arrangement [Abstract]      
Intrinsic value of stock options exercised $ 27,720 $ 13,931 $ 14,713
Intrinsic value of options exercisable $ 38,700