Share-Based Compensation (Fair Value of Option Award) (Details) (USD $)	3 Months Ended
Apr. 30, 2011	May 01, 2010
Share-Based Compensation
Volatility	33.10%	33.60%
Risk-free interest rate	2.20%	2.50%
Expected life in years	5.4	5.4
Dividend yield	1.80%	0.00%
Weighted-average fair value at grant date	$ 14.81	$ 19.51

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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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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