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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. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Volatility of common stock 35.54% 39.60% 38.24%
Average volatility of peer companies 36.78% 39.78% 34.76%
Average correlation coefficient of peer group 0.47 0.42 0.49
Risk free interest rate 1.74% 0.68% 0.44%
Dividend yield 1.15% 1.44% 1.23%