CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net revenues	$ 225,735	$ 231,781	$ 647,110	$ 664,248
Cost of revenues	116,219	111,865	319,266	311,795
Gross profit	109,516	119,916	327,844	352,453
Operating expenses:
Research, development, and engineering	20,811	22,991	66,614	69,280
Selling, general, and administrative	53,715	57,977	163,689	174,756
Gain from litigation settlements	(91)	(1,666)	(998)	(7,816)
Restructuring and other related charges	8,433	0	8,433	0
Total operating expenses	82,868	79,302	237,738	236,220
Operating income	26,648	40,614	90,106	116,233
Interest expense	(7,217)	(59)	(17,278)	(209)
Other non-operating income and (expense), net	398	(1,959)	(2,025)	(1,474)
Income before income taxes	19,829	38,596	70,803	114,550
Income tax expense	3,541	8,212	15,391	28,073
Net income	$ 16,288	$ 30,384	$ 55,412	$ 86,477
Earnings per common share:
Basic (in dollars per share)	$ 0.50	$ 0.73	$ 1.60	$ 2.07
Diluted (in dollars per share)	$ 0.49	$ 0.71	$ 1.56	$ 2.03
Shares used in computing basic earnings per common share	32,579	41,901	34,723	41,780
Shares used in computing diluted earnings per common share	33,259	42,700	35,588	42,674
Cash dividends declared per common share (in dollars per share)	$ 0.15	$ 0.15	$ 0.45	$ 0.45