CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net revenues	$ 202,818	$ 181,365
Cost of revenues	97,186	83,669
Gross profit	105,632	97,696
Operating expenses:
Research, development, and engineering	20,863	19,696
Selling, general, and administrative	48,097	45,904
Restructuring and other related charges	723	0
Total operating expenses	69,683	65,600
Operating income	35,949	32,096
Interest and other income (expense), net	(486)	12
Income before income taxes	35,463	32,108
Income tax expense	8,510	8,545
Net income	$ 26,953	$ 23,563
Earnings per common share:
Basic	$ 0.63	$ 0.57
Diluted	$ 0.62	$ 0.55
Shares used in computing basic earnings per common share	42,692	41,660
Shares used in computing diluted earnings per common share	43,650	42,570
Cash dividends declared per common share	$ 0.10	$ 0.10