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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
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Jan. 01, 2016 | Dec. 26, 2014
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |
Document Period End Date | Jan. 01, 2016 |
Stock-based compensation expense | $ 19,380 | $ 17,842
Share-based Compensation | 19,380 | 17,842
Benefit from income taxes | (5,706) | (5,151)
Total stock-based compensation, net of tax | 13,674 | 12,691
Stock Option [Member] |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |
Stock-based compensation expense | 6,366 | 6,283
Restricted Stock Units [Member] |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |
Stock-based compensation expense | 12,076 | 10,215
Employee Stock Purchase Plan [Member] |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |
Stock-based compensation expense | 938 | 1,344
Cost of Sales [Member] |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |
Stock-based compensation expense | 280 | 246
Cost Of Service [Member] |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |
Stock-based compensation expense | 129 | 122
Research and Development Expense [Member] |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |
Stock-based compensation expense | 5,107 | 5,274
Selling and Marketing Expense [Member] |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |
Stock-based compensation expense | 7,710 | 5,909
General and Administrative Expense [Member] |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |
Stock-based compensation expense | $ 6,154 | $ 6,291

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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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