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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. 31, 2017
Apr. 01, 2016
Mar. 31, 2017
Apr. 01, 2016
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Document Period End Date     Mar. 31, 2017  
Stock-based compensation expense $ 15,983 $ 16,086 $ 33,198 $ 35,466
Share-based Compensation     33,198 35,466
Benefit from income taxes (4,635) (4,706) (9,663) (10,412)
Total stock-based compensation, net of tax 11,348 11,380 23,535 25,054
Stock Option [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 4,575 4,998    
Share-based Compensation     9,378 11,364
Restricted Stock Units (RSUs) [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 10,514 10,267    
Share-based Compensation     22,097 22,343
Employee Stock Purchase Plan [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 894 821    
Share-based Compensation     1,723 1,759
Cost of Sales [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 223 219 481 499
Cost Of Service [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 123 114 257 243
Research and Development Expense [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 4,506 4,268 9,436 9,375
Selling and Marketing Expense [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense 6,509 6,441 13,376 14,151
General and Administrative Expense [Member]        
Stockholders' Equity And Stock-Based Compensation [Line Items]        
Stock-based compensation expense $ 4,622 $ 5,044 $ 9,648 $ 11,198