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COMPUTATION OF EARNINGS (LOSS) PER COMMON SHARE (Tables)
 6 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings per Common Share
The following table sets forth the computation of basic and diluted earnings (loss) per common share for the three and six months ended September 30, 2017 and 2018:
 
 
Three Months Ended September 30,
 
Six Months Ended September 30,
(in thousands, except per share data)
 
2017
 
2018
 
2017
 
2018
Basic earnings (loss) per common share:
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
 
Net income (loss)
 
$
19,953

 
$
(86,709
)
 
$
38,781

 
$
(72,238
)
 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
Weighted average common shares, basic
 
32,570

 
39,281

 
32,538

 
35,938

Dilutive effect of employee equity incentive plans
 
239

 
—

 
573

 
—

Weighted average common shares-diluted
 
32,809

 
39,281

 
33,111

 
35,938

 
 
 
 
 
 
 
 
 
Basic earnings (loss) per common share
 
$
0.59

 
$
(2.21
)
 
$
1.16

 
$
(2.01
)
Diluted earnings (loss) per common share
 
$
0.59

 
$
(2.21
)
 
$
1.14

 
$
(2.01
)
 
 
 
 
 
 
 
 
 
Potentially dilutive securities excluded from diluted earnings (loss) per common share because their effect is anti-dilutive
 
1,389

 
567

 
959

 
385