NET INCOME PER SHARE - Schedule of Calculations of Basic and Diluted Net Income (Loss) Per Share and Potential Common Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income	$ 89,685	$ 21,245	$ 62,995	$ 10,981
Denominator:
Denominator for basic net income per share - weighted average common shares outstanding (in shares)	87,210	91,762	88,985	92,337
Dilutive common equivalent shares:
Weighted average restricted stock units (in shares)	650	640	897	660
Denominator for diluted net income per share - weighted average shares outstanding (in shares)	87,860	92,402	89,882	92,997
Net income per share:
Basic net income per share (in USD per share)	$ 1.03	$ 0.23	$ 0.71	$ 0.12
Diluted net income per share (in USD per share)	$ 1.02	$ 0.23	$ 0.70	$ 0.12