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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 9 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Jun. 30, 2017
Jul. 01, 2016
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Document Period End Date     Jun. 30, 2017  
Stock-based compensation expense $ 15,742 $ 16,007 $ 48,940 $ 51,473
Share-based Compensation     48,940 51,473
Benefit from income taxes (4,568) (4,655) (14,231) (15,067)
Total stock-based compensation, net of tax 11,174 11,352 34,709 36,406
Stock Option [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 4,489 4,980    
Share-based Compensation     13,867 16,344
Restricted Stock Units (RSUs) [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 10,349 10,080    
Share-based Compensation     32,446 32,423
Employee Stock Purchase Plan [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 904 947    
Share-based Compensation     2,627 2,706
Cost of Sales [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 229 220 710 719
Cost Of Service [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 126 113 383 356
Research and Development Expense [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 4,551 4,243 13,987 13,618
Selling and Marketing Expense [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 6,187 6,451 19,563 20,602
General and Administrative Expense [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense $ 4,649 $ 4,980 $ 14,297 $ 16,178