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Fair value of Each Restricted Stock Unit Estimated Based on Market Price of Common Shares on Date of Grant Less Expected Dividend Yield (Detail) (Employee Stock Purchase Plan, USD $)	3 Months Ended		6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated fair value	$ 3.77	$ 4.09	$ 3.77	$ 4.09
Volatility	39.00%	46.00%	39.00%	46.00%
Expected term (in years)	1 year 3 months 18 days	6 months	1 year 3 months 18 days	6 months
Risk-free interest rate	0.20%	0.20%	0.20%	0.20%
Dividend yield	2.00%		2.00%

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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