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Assumptions used to Compute Share-Based Compensation Expense (Detail) (USD $)	3 Months Ended
	May 04, 2013	Apr. 28, 2012
Stock Option Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average risk free rate of interest	1.02%	1.50%
Expected volatility	42.00%	43.00%
Weighted-average expected award life- in years	6 years	5 years 6 months
Dividend yield	2.30%	2.30%
Weighted-average fair value	$ 10.98	$ 10.14
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average risk free rate of interest	0.22%	0.21%
Expected volatility	40.00%	35.00%
Weighted-average expected award life- in years	1 year	1 year
Dividend yield	2.40%	2.70%
Weighted-average fair value	$ 6.66	$ 4.90

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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