Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Net revenues	$ 317,209	$ 338,767	$ 336,330
Cost of goods sold	217,451	236,802	236,120
Gross profit	99,758	101,965	100,210
Operating expenses
Research, development and engineering	29,986	26,667	30,884
Selling, general and administrative	38,384	41,810	41,983
Amortization of acquired intangible assets	5,555	5,978	10,521
Total operating expenses	73,925	74,455	83,388
Operating income	25,833	27,510	16,822
Other income (expense)
Interest income	212	240	157
Interest expense	(1,641)	(1,397)	(1,579)
Other income (expense), net	(915)	4,077	(1,941)
Income before income tax provision	23,489	30,430	13,459
Provision for income tax	(8,748)	(6,690)	(7,413)
Net income	$ 14,741	$ 23,740	$ 6,046
Net income per share
Basic (in dollars per share)	$ 0.47	$ 0.75	$ 0.19
Diluted (in dollars per share)	0.46	0.74	0.19
Cash dividends per common share (in dollars per share)	$ 0.155	$ 0.135	$ 0.12
Weighted average shares used in per share calculation
Basic (in shares)	31,579	31,531	31,146
Diluted (in shares)	32,381	32,239	31,916