Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Basic Net Income Per Share
Net income	$ 10,555	$ 12,684	$ 27,149	$ 14,814
Weighted average shares used in computing basic net income per share	42,427	40,856	42,118	40,456
Net income per share - basic	$ 0.25	$ 0.31	$ 0.64	$ 0.37
Diluted Net Income Per Share
Net income	$ 10,555	$ 12,684	$ 27,149	$ 14,814
Weighted average shares used in computing basic net income per share	42,427	40,856	42,118	40,456
Effect of dilutive securities	2,522	2,028	2,687	1,889
Weighted average shares used in computing diluted net income per share	44,949	42,884	44,805	42,345
Net income per share - diluted	$ 0.23	$ 0.30	$ 0.61	$ 0.35