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EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION (Tables)
 9 Months Ended
Dec. 31, 2017
EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION [Abstract]  
Total Share-based Compensation Expense, Net of Tax
The following table summarizes total share-based compensation expense, net of tax, related to restricted stock units, and represents our results from continuing operations, during the three and nine months ended December 31, 2017 and 2016, which is included in our condensed consolidated statements of income (in thousands, except per share data):
 
  
Three Months Ended
December 31,
  
Nine Months Ended
December 31,
 
  
2017
  
2016
  
2017
  
2016
 
Cost of revenues
 
$
375
  
$
360
  
$
1,126
  
$
1,326
 
Research and development
  
691
   
602
   
2,234
   
1,880
 
Sales and marketing
  
1,087
   
797
   
3,419
   
2,218
 
General and administrative
  
1,419
   
673
   
3,412
   
2,893
 
Share-based compensation expense before income taxes
  
3,572
   
2,432
   
10,191
   
8,317
 
Income tax benefit
  
(906
)
  
(839
)
  
(3,183
)
  
(2,881
)
Total share-based compensation expense after income taxes
 
$
2,666
  
$
1,593
  
$
7,008
  
$
5,436
 
Net impact of share-based compensation on:
                
Basic net income per share
 
$
0.12
  
$
0.07
  
$
0.31
  
$
0.24
 
Diluted net income per share
 
$
0.12
  
$
0.07
  
$
0.30
  
$
0.24
 
Restricted Stock Unit Activity
The following table summarizes restricted stock unit activity for the nine months ended December 31, 2017.
 
  
Time-Based
Restricted Stock Units
  
Performance-Based
Restricted Stock Units
 
  
Number of
Shares
  
Weighted
Average
Grant Date
Fair Value (1)
  
Number of
Shares
  
Weighted
Average
Grant Date
Fair Value (1)
 
Nonvested at March 31, 2017
  
535,000
  
$
46.62
   
439,000
  
$
47.40
 
Granted
  
241,000
   
46.41
   
137,000
   
45.84
 
Vested (2)
  
(149,000
)
  
43.52
   
(62,000
)
  
40.82
 
Canceled and forfeited
  
(5,000
)
  
46.98
   
-
   
-
 
Nonvested at December 31, 2017
  
622,000
  
$
47.27
   
514,000
  
$
47.78
 
 
(1)
The weighted average grant date fair value of restricted stock units is based on the number of shares and the closing market price of our common stock on the date of grant.
(2)
The number of restricted stock units vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.