Employee Stock Purchase and Stock Option Plans (Fair Value of Shares Vested) (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 26, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested	$ 21,817	$ 29,832	$ 25,495
Service Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested	17,481	18,568	6,820
Service, Market, And Performance Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested	$ 4,336	$ 11,264	$ 18,675