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Employee Stock Benefit Plans (Schedule Of Weighted-Average Assumptions Used In Employee Stock Purchase Plan) (Details) (Employee Stock Purchase Plan [Member])	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%
Expected stock price volatility	37.90%	34.00%	35.50%
Risk free interest rate	0.10%	0.16%	0.20%
Expected life of purchase, in years	6 months	6 months	6 months

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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