COMPUTATION OF EARNINGS (LOSS) PER COMMON SHARE (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	$ (41,734)	$ (49,504)	$ (113,971)	$ (10,723)
Denominator:
Weighted average common shares-basic (in shares)	39,314	32,075	37,063	32,384
Dilutive effect of employee equity incentive plans (in shares)	0	0	0	0
Weighted average common shares-diluted (in shares)	39,314	32,075	37,063	32,384
Basic earnings (loss) per common share (in dollars per share)	$ (1.06)	$ (1.54)	$ (3.08)	$ (0.33)
Diluted earnings (loss) per common share (in dollars per share)	$ (1.06)	$ (1.54)	$ (3.08)	$ (0.33)
Potentially dilutive securities excluded from diluted earnings per common share because their effect is anti-dilutive	952	968	456	1,107