Stock-Based Compensation (Schedule Of Estimated Fair Value Of Stock Options Assumptions) (Details)	3 Months Ended
Apr. 01, 2012	Apr. 03, 2011
Stock Options [Member]
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items]
Expected life (years)	3.50	4.00
Interest rate	0.40%	1.50%
Volatility-historical	56.00%	52.10%
Dividend yield	0.00%	0.00%
Stock Purchase Rights [Member]
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items]
Expected life (years)	0.5	0.5
Interest rate	0.06%	0.14%
Volatility-historical	52.60%	41.00%
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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