Stock-Based Compensation (Schedule Of Weighted Average Fair Value Of Stock Options Granted To Employees) (Details) (USD $)	1 Months Ended	12 Months Ended
Dec. 31, 2010	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Stock-Based Compensation [Abstract]
Fair value of options granted		$ 9.17	$ 11.79	$ 12.17
Assumptions, Expected life (years)		5.5	4.8	4.7
Assumptions, Risk-free interest rate		0.90%	2.20%	2.30%
Assumptions, Volatility		33.90%	31.70%	32.80%
Assumptions, Dividend yield	0.00%	2.00%	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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