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, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income (loss)	$ (24,507)	$ 17,629	$ (24,753)	$ 40,338
Denominator:
Denominator for basic net income per share - weighted average common shares outstanding (in shares)	98,797	41,206	77,126	41,128
Dilutive common equivalent shares:
Weighted average stock options (in shares)	0	7	0	11
Weighted average restricted stock units (in shares)	0	323	0	540
Denominator for diluted net income per share - weighted average shares outstanding (in shares)	98,797	41,536	77,126	41,679
Net income per share:
Basic net income (loss) per share (in USD per share)	$ (0.25)	$ 0.43	$ (0.32)	$ 0.98
Diluted net income (loss) per share (in USD per share)	$ (0.25)	$ 0.42	$ (0.32)	$ 0.97