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Stockholders' Equity And Stock-Based Compensation (Schedule Of Fair Value Of Stock-Based Awards Estimated Using Weighted-Average Assumptions) (Details)
12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Stockholders' Equity And Stock-Based Compensation [Abstract]      
Document Period End Date Sep. 28, 2018    
Expected life (in years) 5 years 23 days 5 years 1 month 17 days 5 years 2 months 27 days
Risk-free interest rate 2.20% 2.10% 1.70%
Expected stock price volatility 22.60% 27.40% 29.80%
Dividend yield 1.10% 1.10% 1.40%