Stockholders' Equity And Stock-Based Compensation (Schedule Of Fair Value Of Stock-Based Awards Estimated Using Weighted-Average Assumptions) (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Apr. 01, 2016	Mar. 31, 2017	Apr. 01, 2016
Stockholders' Equity And Stock-Based Compensation [Abstract]
Document Period End Date			Mar. 31, 2017
Expected life (in years)	5 years 1 month 17 days	5 years 2 months 27 days	5 years 1 month 17 days	5 years 2 months 27 days
Risk-free interest rate	1.90%	1.50%	2.10%	1.70%
Expected stock price volatility	27.00%	30.10%	27.50%	29.80%
Dividend yield	1.20%	1.40%	1.10%	1.40%