CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net revenues	$ 206,358	$ 216,662
Cost of revenues	99,000	101,952
Gross profit	107,358	114,710
Operating expenses:
Research, development, and engineering	23,194	22,520
Selling, general, and administrative	55,678	56,429
Gain from litigation settlements	(876)	(2,000)
Total operating expenses	77,996	76,949
Operating income	29,362	37,761
Interest expense	(2,741)	(8)
Other non-operating income and (expense), net	(285)	1,028
Income before income taxes	26,336	38,781
Income tax expense	5,108	10,109
Net income	$ 21,228	$ 28,672
Earnings per common share:
Basic	$ 0.56	$ 0.69
Diluted	$ 0.55	$ 0.68
Shares used in computing basic earnings per common share	38,002	41,619
Shares used in computing diluted earnings per common share	38,943	42,466
Cash dividends declared per common share	$ 0.15	$ 0.15