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Share-Based Employee Compensation (Schedule of Weighted-Average Assumptions) (Details) - Stock options - $ / shares
12 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 2.40% 1.40%
Expected dividends yield 1.80% 1.50%
Expected stock price volatility 28.80% 29.00%
Expected life of options (in years) 3 years 4 months 24 days 3 years 6 months
Weighted-average grant date fair value $ 18.49 $ 20.92