Employee Stock Award, Option and Benefit Plans - Stock Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Sep. 28, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 13,985	$ 13,654	$ 13,599
Total stock-based compensation cost capitalized as part of inventory	2,500	2,500
Total stock-based compensation cost amortized into income	2,500	2,400
Total compensation cost, unvested stock-based awards granted but not yet recognized	$ 19,000
Employee Service Share-based Compensation, Options, Total Compensation Cost Not yet Recognized, Period for Recognition	1 month
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Forfeitures	$ 600
Total compensation cost, weighted-average period of amortization (in years and months)	1 year 4 months 24 days
Cost of Sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 2,530	2,393	2,151
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	1,946	2,033	1,851
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	13,756	14,471	14,889
Income tax benefit
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Income tax benefit	(4,247)	$ (5,243)	$ (5,292)
Employee Stock Purchase Plans
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation cost, unvested stock-based awards granted but not yet recognized	$ 200