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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation Expense Included in Statements of Operations
The following table summarizes the amount of stock-based compensation included in the condensed consolidated statements of operations:
 
 
Three Months Ended 
 September 30,
 
Six Months Ended 
 September 30,
(in thousands)
 
2016
 
2017
 
2016
 
2017
Cost of revenues
 
$
778

 
$
890

 
$
1,620

 
$
1,792

 
 
 
 
 
 
 
 
 
Research, development, and engineering
 
2,408

 
2,008

 
4,892

 
4,109

Selling, general, and administrative
 
4,717

 
5,864

 
9,804

 
12,117

Stock-based compensation included in operating expenses
 
7,125

 
7,872

 
14,696

 
16,226

Total stock-based compensation
 
7,903

 
8,762

 
16,316

 
18,018

Income tax benefit
 
(2,877
)
 
(2,840
)
 
(5,649
)
 
(7,689
)
Total stock-based compensation, net of tax
 
$
5,026

 
$
5,922

 
$
10,667

 
$
10,329