Computation of Basic and Diluted Net Income Loss Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Basic Net Income Per Share
Net income	$ 4,393	$ 2,684	$ 3,729	$ 11,272
Weighted average shares used in computing basic net income per share	39,592	39,417	39,179	39,331
Net income per share - basic	$ 0.11	$ 0.07	$ 0.10	$ 0.29
Diluted Net Income Per Share
Net income	$ 4,393	$ 2,684	$ 3,729	$ 11,272
Weighted average shares used in computing basic net income per share	39,592	39,417	39,179	39,331
Effect of dilutive securities	2,134	1,448	2,136	2,087
Weighted average shares used in computing diluted net income per share	41,726	40,865	41,315	41,418
Net income per share - diluted	$ 0.11	$ 0.07	$ 0.09	$ 0.27