NET LOSS PER SHARE - Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net loss available to common stockholders	$ (23,771)	$ (88,520)	$ (60,608)	$ (91,235)
Denominator:
Common shares - basic and diluted (in shares)	95,370	92,029	94,093	91,709
Net loss per share
Basic and diluted (in dollars per share)	$ (0.25)	$ (0.96)	$ (0.64)	$ (0.99)