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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
Mar. 30, 2018
Mar. 31, 2017
Mar. 30, 2018
Mar. 31, 2017
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Document Period End Date     Mar. 30, 2018  
Stock-based compensation expense $ 17,691 $ 15,983    
Share-based Compensation     $ 36,375 $ 33,198
Benefit from income taxes (3,657) (4,635) (7,553) (9,663)
Total stock-based compensation, net of tax 14,034 11,348 28,822 23,535
Stock Option [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 5,090 4,575    
Share-based Compensation     12,054 9,378
Restricted Stock Units (RSUs) [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 11,632 10,514    
Share-based Compensation     22,412 22,097
Employee Stock Purchase Plan [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 969 894    
Share-based Compensation     1,909 1,723
Cost of Sales [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 245 223 507 481
Cost Of Service [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 142 123 260 257
Research and Development Expense [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 4,750 4,506 9,627 9,436
Selling and Marketing Expense [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 5,846 6,509 11,797 13,376
General and Administrative Expense [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense $ 6,708 $ 4,622 $ 14,184 $ 9,648