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COMPUTATION OF EARNINGS PER COMMON SHARE (Tables)
 6 Months Ended
Sep. 30, 2016
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 per common share for the three and six months ended September 30, 2015 and 2016:
 
 
Three Months Ended 
 September 30,
 
Six Months Ended 
 September 30,
(in thousands, except per share data)
 
2015
 
2016
 
2015
 
2016
Numerator:
 
 
 
 
 
 
 
 
Net income
 
$
17,896

 
$
20,474

 
$
39,124

 
$
40,861

 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
Weighted average common shares-basic
 
33,590

 
32,281

 
35,796

 
32,269

Dilutive effect of employee equity incentive plans
 
655

 
445

 
880

 
596

Weighted average common shares-diluted
 
34,245

 
32,726

 
36,676

 
32,865

 
 
 
 
 
 
 
 
 
Basic earnings per common share
 
$
0.53

 
$
0.63

 
$
1.09

 
$
1.27

Diluted earnings per common share
 
$
0.52

 
$
0.63

 
$
1.07

 
$
1.24

 
 
 
 
 
 
 
 
 
Potentially dilutive securities excluded from diluted earnings per common share because their effect is anti-dilutive
 
283

 
543

 
257

 
634