Net Income (Loss) Per Share - Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income (loss)	$ 2,437	$ (2,239)	$ 5,221	$ (6,071)
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Weighted-average shares used to compute net income (loss) per share, basic (in shares)	52,265	53,270	52,275	53,133
Dilutive shares from stock options and RSUs (in shares)	1,056	0	813	0
Weighted-average shares used to compute net income (loss) per share, diluted (in shares)	53,321	53,270	53,088	53,133
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss) per share, basic (in usd per share)	$ 0.05	$ (0.04)	$ 0.10	$ (0.11)
Net income (loss) per share, diluted (in usd per share)	$ 0.05	$ (0.04)	$ 0.10	$ (0.11)