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Effect of Recording Stock-Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,084	$ 671	$ 3,152	$ 3,493
Tax effect on stock-based compensation expense	(384)	(278)	(1,131)	(1,296)
Net effect on net income or loss	700	393	2,021	2,197
Employee and director stock options and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,010	626	2,977	3,370
Non-employee stock award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	8		25
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 66	$ 45	$ 150	$ 123

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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