Stockholders' Equity And Stock-Based Compensation (Schedule Of Fair Value Of Stock-Based Awards Estimated Using Weighted-Average Assumptions) (Details) (USD $) | 12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2011 | Sep. 24, 2010 | Sep. 25, 2009 | |
| Stockholders' Equity And Stock-Based Compensation [Abstract] | |||
| Expected life (in years) | 4.40 | 4.66 | 5.02 |
| Risk-free interest rate | 1.50% | 2.20% | 2.00% |
| Expected stock price volatility | 41.40% | 41.70% | 47.10% |
| Dividend yield | |||
| X | ||||||||||
- Definition Stockholders Equity And Stock-Based Compensation Abstract
|
| X | ||||||||||
- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|