Computation of Basic and Diluted Net (Loss) Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Basic Net Income (Loss) Per Share
Net income (loss)	$ 8,859	$ (1,709)
Weighted average shares used in computing basic net income (loss) per share	41,696	40,062
Net income (loss) per share - basic	$ 0.21	$ (0.04)
Diluted Net Income (Loss) Per Share
Net income (loss)	$ 8,859	$ (1,709)
Weighted average shares used in computing basic net income (loss) per share	41,696	40,062
Effect of dilutive securities	2,714
Weighted average shares used in computing diluted net income (loss) per share	44,410	40,062
Net income (loss) per share - diluted	$ 0.20	$ (0.04)