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Effect of Recording Stock-Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,067	$ 1,863	$ 2,068	$ 2,724
Tax effect on stock-based compensation expense	(385)	(711)	(747)	(1,019)
Net effect on net income or loss	682	1,152	1,321	1,705
Employee and director stock options and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,012	1,824	1,967	2,646
Non-employee stock award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	13		17
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 42	$ 39	$ 84	$ 78

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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