Share-Based Compensation Valuation Assumptions (Details)	12 Months Ended
Jan. 30, 2010 Restricted Stock [Member]	Jan. 28, 2012 Stock Option [Member] Years	Jan. 29, 2011 Stock Option [Member] Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.20%	2.27%	2.84%
Asset volatility	50.00%	54.00%	54.00%
Time to Liquidity	7 months
Expected Term		6.25	6.25
Marketability discount	10.00%
Equity dividend yield	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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