CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net revenues	$ 221,309	$ 203,926
Cost of revenues	111,466	100,643
Gross profit	109,843	103,283
Operating expenses:
Research, development, and engineering	23,701	21,213
Selling, general, and administrative	64,203	56,233
(Gain) loss, net from litigation settlements	(30)	(176)
Restructuring and other related charges	1,320	2,573
Total operating expenses	89,194	79,843
Operating income	20,649	23,440
Interest expense	(7,327)	(7,303)
Other non-operating income and (expense), net	1,996	914
Income before income taxes	15,318	17,051
Income tax expense (benefit)	847	(1,777)
Net income	$ 14,471	$ 18,828
Earnings per common share:
Basic (in dollars per share)	$ 0.43	$ 0.58
Diluted (in dollars per share)	$ 0.42	$ 0.57
Shares used in computing earnings per common share:
Basic (in shares)	32,594	32,506
Diluted (in shares)	33,534	33,211
Cash dividends declared per common share (in dollars per share)	$ 0.15	$ 0.15