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Note 17. Equity Incentive Plans and Employee Benefits (Detail) - Stock-Based Compensation Expense (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 02, 2013	Jan. 28, 2012	Jan. 29, 2011
Stock-based compensation	$ 10,595	$ 12,025	$ 12,577
Cost of Sales [Member]
Stock-based compensation	487	478	560
Research and Development Expense [Member]
Stock-based compensation	5,740	6,277	6,745
Selling and Marketing Expense [Member]
Stock-based compensation	1,811	2,137	2,094
General and Administrative Expense [Member]
Stock-based compensation	$ 2,557	$ 3,133	$ 3,178

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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