CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net revenues	$ 232,933	$ 225,735	$ 672,222	$ 647,110
Cost of revenues	122,753	116,219	338,523	319,266
Gross profit	110,180	109,516	333,699	327,844
Operating expenses:
Research, development, and engineering	21,393	20,811	66,116	66,614
Selling, general, and administrative	56,919	53,715	169,581	163,689
(Gain) loss, net from litigation settlements	(103)	(91)	4,287	(998)
Restructuring and other related charges/adjustments	113	8,433	(1,350)	8,433
Total operating expenses	78,322	82,868	238,634	237,738
Operating income	31,858	26,648	95,065	90,106
Interest expense	(7,322)	(7,217)	(21,867)	(17,278)
Other non-operating income and (expense), net	427	398	4,119	(2,025)
Income before income taxes	24,963	19,829	77,317	70,803
Income tax expense	2,742	3,541	14,235	15,391
Net income	$ 22,221	$ 16,288	$ 63,082	$ 55,412
Earnings per common share:
Basic (in dollars per share)	$ 0.69	$ 0.50	$ 1.96	$ 1.60
Diluted (in dollars per share)	$ 0.68	$ 0.49	$ 1.92	$ 1.56
Shares used in computing basic earnings per common share	32,242	32,579	32,260	34,723
Shares used in computing diluted earnings per common share	32,826	33,259	32,895	35,588
Cash dividends declared per common share (in dollars per share)	$ 0.15	$ 0.15	$ 0.45	$ 0.45