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Shareholders' Equity (Schedule Of Weighted Average Assumptions Used In Stock Options Granted) (Detail)	3 Months Ended		9 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Stockholders Equity [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Expected life of options	4 years 1 month 6 days	4 years 2 months 12 days	4 years 2 months 12 days	4 years 2 months 12 days
Expected stock price volatility	41.10%	43.60%	41.20%	43.60%
Risk free interest rate	0.60%	1.60%	0.70%	1.60%

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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