STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Sep. 30, 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 September 30,						Six Months Ended September 30,
(in thousands)	2017			2018			2017			2018
Cost of revenues	$	890		$	1,073		$	1,792		$	2,036
Research, development, and engineering	2,008			2,768			4,109			4,990
Selling, general, and administrative	5,864			6,999			12,117			11,964
Stock-based compensation included in operating expenses	7,872			9,767			16,226			16,954
Total stock-based compensation	8,762			10,840			18,018			18,990
Income tax benefit	(2,840		)	(2,227		)	(7,689		)	(5,981		)
Total stock-based compensation, net of tax	$	5,922		$	8,613		$	10,329		$	13,009