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Stockholders' Equity And Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense By Plan) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 01, 2016 | Mar. 27, 2015 | Apr. 01, 2016 | Mar. 27, 2015
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Document Period End Date |  |  | Apr. 01, 2016 |
Stock-based compensation expense | $ 16,086 | $ 16,667 | $ 35,466 | $ 34,509
Share-based Compensation |  |  | 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
Stock Option [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 4,998 | 5,729 |  |
Share-based Compensation |  |  | 11,364 | 12,012
Restricted Stock Units [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 10,267 | 10,077 |  |
Share-based Compensation |  |  | 22,343 | 20,292
Employee Stock Purchase Plan [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 821 | 861 |  |
Share-based Compensation |  |  | 1,759 | 2,205
Cost of Sales [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 219 | 224 | 499 | 470
Cost Of Service [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 114 | 115 | 243 | 237
Research and Development Expense [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 4,268 | 4,938 | 9,375 | 10,212
Selling and Marketing Expense [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 6,441 | 5,576 | 14,151 | 11,485
General and Administrative Expense [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 5,044 | $ 5,814 | $ 11,198 | $ 12,105

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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