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Stockholders' Equity And Stock-Based Compensation (Schedule of Stock-Based Compensation By Classification) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 01, 2016 | Mar. 27, 2015 | Apr. 01, 2016 | Mar. 27, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense | $ 16,086 | $ 16,667 | $ 35,466 | $ 34,509
Benefit from income taxes | (4,706) | (4,890) | (10,412) | (10,041)
Total stock-based compensation, net of tax | 11,380 | 11,777 | 25,054 | 24,468
Cost of products [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense | 219 | 224 | 499 | 470
Cost of services [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense | 114 | 115 | 243 | 237
Research and development [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense | 4,268 | 4,938 | 9,375 | 10,212
Sales and marketing [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense | 6,441 | 5,576 | 14,151 | 11,485
General and administrative [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense | $ 5,044 | $ 5,814 | $ 11,198 | $ 12,105

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