NET LOSS PER SHARE - Schedule of Calculations of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net loss	$ (26,428)	$ (2,468)	$ (88,932)	$ (26,690)
Denominator:
Denominator for basic net loss per share - weighted average common shares outstanding (in shares)	78,631	88,589	79,490	89,878
Dilutive common equivalent shares:
Weighted average restricted stock units (in shares)	0	0	0	0
Denominator for diluted net loss per share - weighted average shares outstanding (in shares)	78,631	88,589	79,490	89,878
Net loss per share:
Basic net loss per share (in USD per share)	$ (0.34)	$ (0.03)	$ (1.12)	$ (0.30)
Diluted net loss per share (in USD per share)	$ (0.34)	$ (0.03)	$ (1.12)	$ (0.30)