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Employee Benefits and Stock-Based Compensation - Classification of Stock-Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Stock-based compensation:
Total stock-based compensation	$ 1,606	$ 943
Cost of revenue [Member]
Stock-based compensation:
Total stock-based compensation	34	14
Research and development [Member]
Stock-based compensation:
Total stock-based compensation	974	532
Selling, general and administrative [Member]
Stock-based compensation:
Total stock-based compensation	$ 598	$ 397

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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