Employee Stock Benefit Plans (Schedule Of Weighted-Average Assumptions Used In Employee Stock Purchase Plan) (Details) (Employee Stock Purchase Plan [Member], USD $)	12 Months Ended
Dec. 30, 2011	Dec. 31, 2010	Jan. 01, 2010
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield
Expected stock price volatility	$ 34.00%	$ 35.50%	$ 53.10%
Risk free interest rate	$ 0.16%	$ 0.20%	$ 0.90%
Expected life of purchase, in years	0.5	0.5	0.5

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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