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		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Net income (loss)	$ (7,915)	$ 11,233	$ (246)	$ 22,709
Denominator:
Denominator for basic net income per share - weighted average common shares outstanding (in shares)	91,410	41,060	66,232	41,071
Dilutive common equivalent shares:
Weighted average stock options (in shares)	0	11	0	14
Weighted average restricted stock units (in shares)	0	581	0	647
Denominator for diluted net income per share - weighted average shares outstanding (in shares)	91,410	41,652	66,232	41,732
Net income per share:
Basic net income (loss) per share (in USD per share)	$ (0.09)	$ 0.27	$ 0.00	$ 0.55
Diluted net income (loss) per share (in USD per share)	$ (0.09)	$ 0.27	$ 0.00	$ 0.54