NET INCOME PER SHARE - Schedule of Calculations of Basic and Diluted Net Income Per Share and Potential Common Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net income	$ 7,669	$ 11,476
Denominator:
Denominator for basic net income per share - weighted average common shares outstanding (in shares)	40,776	41,081
Dilutive common equivalent shares:
Weighted average stock options (in shares)	0	17
Weighted average restricted stock units (in shares)	595	710
Denominator for diluted net income per share - weighted average shares outstanding (in shares)	41,371	41,808
Net income per share:
Basic net income per share (in USD per share)	$ 0.19	$ 0.28
Diluted net income per share (in USD per share)	$ 0.19	$ 0.27