Stock-Based Compensation and Benefit Plans, Fair Value Assumptions (Details 3) (USD $)	12 Months Ended
Feb. 03, 2012 year	Jan. 28, 2011 year	Jan. 29, 2010 year
Assumptions for weighted average fair value of stock options
Weighted-average grant date fair value of stock options granted per option	$ 5.13	$ 5.01	$ 3.71
Expected term (in years)	4.6	4.5	4.5
Risk-free interest rate (U.S. Government Treasury Note)	1.90%	2.20%	1.80%
Volatility	36.00%	37.00%	44.00%
Dividends	0.00%	0.00%	0.00%

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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