COMPUTATION OF EARNINGS (LOSS) PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income (loss)	$ (44,871)	$ 14,471
Denominator:
Weighted average common shares-basic (in shares)	39,239	32,594
Dilutive effect of employee equity incentive plans (in shares)	0	940
Weighted average common shares-diluted (in shares)	39,239	33,534
Basic earnings (loss) per common share (in dollars per share)	$ (1.14)	$ 0.43
Diluted earnings (loss) per common share (in dollars per share)	$ (1.14)	$ 0.42
Potentially dilutive securities excluded from diluted earnings per common share because their effect is anti-dilutive	706	202