XML 27 R30.htm IDEA: XBRL DOCUMENT

Shareholders' Equity (Schedule Of Weighted Average Assumptions Used In Stock Options Granted) (Detail)	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Stockholders Equity [Line Items]
Expected dividend yield	0.00%	0.00%
Expected stock price volatility	40.30%	45.40%
Risk free interest rate	0.60%	0.80%
Expected life of options	4 years 1 month 6 days	4 years 1 month 6 days

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.

+ References+ Details