Stockholders' Equity (Schedule Of Weighted Average Assumptions Used In Calculating Share-Based Compensation Expense) (Details)	12 Months Ended
Sep. 28, 2012 Y	Sep. 30, 2011 Y	Oct. 01, 2010 Y
Stockholders' Equity Note [Abstract]
Expected volatility	59.21%	49.26%	56.19%
Risk free interest rate (7 year contractual life options)	0.52%	0.63%	1.12%
Dividend yield	0.00%	0.00%	0.00%
Expected option life (7 year contractual life options)	4.09	4.10	4.23

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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