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Stock Based Compensation (Detail) - Schedule for estimation of fair value for the stock based awards granted (USD $)	6 Months Ended
	Jul. 28, 2012
Dividend yield	0.00%
Minimum [Member]
Expected stock price volatility	68.50%
Risk-free interest rate	0.70%
Expected award life (in years)	4 years 328 days
Weighted average fair value per share of awards granted during the period (in Dollars per share)	1.53
Maximum [Member]
Expected stock price volatility	75.40%
Risk-free interest rate	1.00%
Expected award life (in years)	7 years
Weighted average fair value per share of awards granted during the period (in Dollars per share)	1.94

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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