Shareholders' Equity (Schedule Of Weighted Average Assumptions Used In Stock Options Granted) (Details) (USD $)	3 Months Ended
Mar. 30, 2012 Y	Apr. 01, 2011 Y
Shareholders' Equity [Abstract]
Expected dividend yield
Expected stock price volatility	$ 45.40%	$ 41.90%
Risk free interest rate	0.80%	1.00%
Expected life of option, years	4.1	4.2

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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