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Stockholders' Equity And Stock-Based Compensation (Schedule of Stock-Based Compensation By Classification) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Document Period End Date Sep. 28, 2018    
Recognized tax benefit from the exercise of ISO and ESPP $ 577 $ 802 $ 550
Stock-based compensation expense 71,249 65,343 66,985
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 12,595 18,959 19,627
Allocated Share-based Compensation Expense, Net of Tax 58,654 46,384 47,358
Cost of products [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense 1,009 946 859
Cost of services [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense 565 512 547
Research and development [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense 19,515 18,497 17,771
Sales and marketing [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense 24,997 26,175 27,579
General and administrative [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense $ 25,163 $ 19,213 $ 20,229