COMPENSATION (Tables)

9 Months Ended

Dec. 31, 2018

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 December 31,					Nine Months Ended December 31,
(in thousands)	2017		2018			2017			2018
Cost of revenues	$	917	$	1,067		$	2,709		$	3,103
Research, development, and engineering	2,049		2,887			6,158			7,877
Selling, general, and administrative	5,063		7,765			17,180			19,729
Stock-based compensation included in operating expenses	7,112		10,652			23,338			27,606
Total stock-based compensation	8,029		11,719			26,047			30,709
Income tax benefit	2,039		(1,624		)	(5,650		)	(7,605		)
Total stock-based compensation, net of tax	$	10,068	$	10,095		$	20,397		$	23,104