Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Sep. 30, 2009	Sep. 30, 2009	Sep. 30, 2010 Restated [Member]	Sep. 30, 2010 Restated [Member]
Revenues	$ 74,672	$ 147,672	$ 98,073	$ 195,283
Cost and operating expenses:
Cost of revenues	45,637	96,054	59,416	117,640
Research and development	5,416	9,944	7,857	15,192
Selling, general and administrative	12,712	23,597	17,346	32,529
Amortization of acquisition related intangibles	460	905	374	762
Restructuring and impairments	117	451
Total cost and operating expenses	64,342	130,951	84,993	166,123
Operating income	10,330	16,721	13,080	29,160
Interest income, net	190	433	191	367
Other income (expense), net	(871)	(2,847)	2,448	2,618
Income before income tax expense	9,649	14,307	15,719	32,145
Income tax expense	5,309	8,175	7,880	15,137
Net income	$ 4,340	$ 6,132	$ 7,839	$ 17,008
Net income per common share
Basic	$ 0.10	$ 0.14	$ 0.17	$ 0.37
Diluted	$ 0.10	$ 0.14	$ 0.17	$ 0.37
Weighted average number of common shares outstanding
Basic	44,247	44,020	45,482	45,363
Diluted	45,233	44,922	46,217	46,099