Stockholders' Equity And Stock-Based Compensation (Schedule Of Fair Value Of Stock-Based Awards Estimated Using Weighted-Average Assumptions) (Details)	12 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Stockholders' Equity And Stock-Based Compensation [Abstract]
Expected life (in years)	4 years 7 months 21 days	4 years 6 months 29 days	4 years 4 months 13 days
Risk-free interest rate	1.50%	1.40%	0.50%
Expected stock price volatility	29.60%	32.00%	40.10%
Dividend yield	0.90%	0.00%	0.00%