CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net revenues	$ 203,926	$ 223,106
Cost of revenues	100,643	110,033
Gross profit	103,283	113,073
Operating expenses:
Research, development, and engineering	21,213	22,344
Selling, general, and administrative	56,233	55,787
(Gain) loss, net from litigation settlements	(176)	4,739
Restructuring and other related charges (credits)	2,573	(1,048)
Total operating expenses	79,843	81,822
Operating income	23,440	31,251
Interest expense	(7,303)	(7,288)
Other non-operating income and (expense), net	914	2,352
Income before income taxes	17,051	26,315
Income tax expense (benefit)	(1,777)	5,928
Net income	$ 18,828	$ 20,387
Earnings per common share:
Basic (in dollars per share)	$ 0.58	$ 0.63
Diluted (in dollars per share)	$ 0.57	$ 0.62
Shares used in computing basic earnings per common share	32,506	32,243
Shares used in computing diluted earnings per common share	33,211	32,818
Cash dividends declared per common share (in dollars per share)	$ 0.15	$ 0.15