XML 26 R47.htm IDEA: XBRL DOCUMENT

Schedule of Assumptions Used to Calculate Weighted Average Fair Value of Stock Option Grants (Detail)	3 Months Ended
	Mar. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	43.30%
Risk-free interest rate	0.90%
Expected term (in years)	5 years 3 months 18 days
Expected dividend yield	2.00%

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