CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jul. 02, 2011
Net sales	$ 58,969	$ 77,046
Cost of sales	35,316	43,286
Gross profit	23,653	33,760
Operating expenses:
Selling, service and administration	15,663	16,496
Research, development and engineering	9,534	11,234
Legal settlement costs		550
Net operating expenses	25,197	28,280
Operating (loss) income	(1,544)	5,480
Non-operating (expense) income:
Gain on sale of previously impaired auction rate securities		2,729
Interest and other (expense) income, net	(150)	(137)
Total non-operating (expense) income	(150)	2,592
(Loss) income before income taxes	(1,694)	8,072
(Benefit from) provision for income taxes	(750)	2,159
Net (loss) income	$ (944)	$ 5,913
Net (loss) income per share - basic	$ (0.03)	$ 0.21
Net (loss) income per share - diluted	$ (0.03)	$ 0.20
Weighted average number of shares - basic	29,116	28,471
Weighted average number of shares - diluted	29,116	29,262
Cash dividends paid per common share	$ 0.08