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Stockholders' Equity (Schedule Of Weighted Average Assumptions Used in Calculating Share-Based Performance Awards) (Details) - Performance Shares [Member]
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate 32.65% 35.54% 39.60%
Average volatility of peer companies 37.07% 36.78% 39.78%
Average correlation coefficient of peer group 0.47 0.47 0.42
Risk free interest rate 2.98% 1.74% 0.68%
Dividend yield 1.84% 1.15% 1.44%