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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. 29, 2017
Sep. 30, 2016
Oct. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Volatility of common stock 39.60% 38.24% 37.51%
Average volatility of peer companies 39.78% 34.76% 28.42%
Average correlation coefficient of peer group 0.42 0.49 0.55
Risk free interest rate 0.68% 0.44% 0.12%
Dividend yield 1.44% 1.23% 0.85%