CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Net sales	$ 59,647	$ 80,152	$ 105,819	$ 139,121
Cost of sales	35,015	46,632	61,801	81,948
Gross profit	24,632	33,520	44,018	57,173
Operating expenses:
Selling, service and administration	14,251	15,114	28,798	30,777
Research, development and engineering	9,719	10,527	18,144	20,061
Business Combination, Bargain Purchase, Gain Recognized, Amount	(35)	0	(499)	0
Net operating expenses	23,935	25,641	46,443	50,838
Operating (loss) income	697	7,879	(2,425)	6,335
Other-than-temporary impairment of cost based investments	(3,588)	0	(3,588)	0
Non-operating (expense) income:
Interest and other (expense) income, net	80	91	20	(59)
Other Nonoperating Income (Expense)	(3,508)	91	(3,568)	(59)
Income (loss) before income taxes	(2,811)	7,970	(5,993)	6,276
Provision for (benefit from) income taxes	(33)	2,759	68	2,009
Net (loss) income	$ (2,778)	$ 5,211	$ (6,061)	$ 4,267
Net (loss) income per share - basic	$ (0.09)	$ 0.18	$ (0.20)	$ 0.15
Net (loss) income per share - diluted	$ (0.09)	$ 0.17	$ (0.20)	$ 0.14
Weighted average number of shares - basic	29,967	29,339	29,856	29,228
Weighted average number of shares - diluted	29,967	29,961	29,856	29,912
Cash dividends paid per common share	$ 0.08	$ 0.08	$ 0.16	$ 0.16