Stockholders' Equity and Stock-Based Compensation (Schedule Of Fair Value Of Stock-Based Awards Estimated Using Weighted-Average Assumptions) (Details)	3 Months Ended
Dec. 28, 2012	Dec. 30, 2011
Share-based Compensation [Abstract]
Expected life (in years)	4.37	4.53
Risk-free interest rate	0.50%	0.80%
Expected stock price volatility	40.60%	44.50%
Dividend yield	0.00%	0.00%

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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