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Equity-Based Compensation (Weighted-Average Assumptions Used For Purchase Rights Granted Under Stock Purchase Plan) (Details) (USD $)	6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010
Expected dividend yield	0.00%	0.00%
Expected volatility	35.33%	39.50%
Risk free interest rate	2.01%	2.26%
Stock Purchase Plan [Member]
Fair market value	$ 38.52	$ 26.79
Option price	$ 36.60	$ 25.45
Expected dividend yield	0.00%	0.00%
Expected volatility	26.00%	26.00%
Risk free interest rate	0.11%	0.11%

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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