Stock-Based Compensation (Stock Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 5,041	$ 4,101	$ 18,075	$ 11,371
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	900	700	2,600	2,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Amortized Amount	900	700	2,400	1,900
Total compensation cost, unvested stock-based awards granted but not yet recognized	38,100		$ 38,100
Total compensation cost, weighted-average period of amortization (in years)			1 year 6 months 26 days
Cost of Sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	880	677	$ 2,618	1,876
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	639	610	2,289	1,646
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	5,373	4,402	18,323	11,299
Income tax benefit
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Income tax benefit	(1,851)	$ (1,588)	(5,155)	(3,450)
Employee Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation cost, unvested stock-based awards granted but not yet recognized	$ 1,000		$ 1,000
Total compensation cost, weighted-average period of amortization (in years)			6 months
PeriodEnd
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount			$ 1,100	$ 800