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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. 30, 2016
Oct. 02, 2015
Sep. 26, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Intrinsic value of stock options exercised $ 4,149 $ 442 $ 9,590
Intrinsic value of options exercisable $ 17,900