XML 72 R60.htm IDEA: XBRL DOCUMENT

Summary Of Weighted Average Assumptions (Detail)	12 Months Ended
Summary Of Weighted Average Assumptions (Detail)	Jan. 29, 2012	Jan. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	5 years	5 years 1 month 6 days
Expected volatility	46.60%	47.30%
Risk-free interest rate	2.20%	2.60%
Dividend yield	2.30%	2.20%

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