Net Income (Loss) Per Share - Calculation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Net loss attributable to common stockholders:
Net income (loss)	$ 10,235	$ (4,422)	$ (67,498)
Shares used to compute net loss per share attributable to common stockholders:
Weighted-average shares used to compute net loss per share, basic (in shares)	52,456	53,070	51,898
Incremental common shares attributable to dilutive effect of share-based payment arrangements	1,116	0	0
Weighted-average shares used to compute net loss per share, diluted (in shares)	53,572	53,070	51,898
Net income (loss) per share:
Net loss per share, basic (in usd per share)	$ 0.20	$ (0.08)	$ (1.30)
Net loss per share, diluted (in usd per share)	$ 0.19	$ (0.08)	$ (1.30)