Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements Of Operations [Abstract]
Net revenues	$ 66,989	$ 59,855	$ 184,070	$ 167,476
Cost of revenues	31,926	26,973	78,178	72,294
Gross margin	35,063	32,882	105,892	95,182
Operating expenses:
Selling, general and administrative	15,217	14,437	43,281	42,653
Research and development	11,452	10,683	35,041	32,061
Amortization of acquired intangible assets	1,143	663	2,651	1,299
Acquisition costs and other related expenses	145	100	763	407
Total operating expenses	27,957	25,883	81,736	76,420
Income from operations	7,106	6,999	24,156	18,762
Interest income	3	6	12	19
Interest expense	(8)	(10)	(26)	(68)
Other income, net	524	390	1,323	1,310
Income from continuing operations before income taxes	7,625	7,385	25,465	20,023
Income taxes	2,380	2,007	8,522	5,780
Income from continuing operations	5,245	5,378	16,943	14,243
Loss from discontinued operations, net of income taxes				(52)
Net income	5,245	5,378	16,943	14,191
Basic net earnings (loss) per share:
Income from continuing operations	$ 0.18	$ 0.20	$ 0.58	$ 0.59
Loss from discontinued operations, net of income taxes
Net income	$ 0.18	$ 0.20	$ 0.58	$ 0.59
Diluted net earnings (loss) per share:
Income from continuing operations	$ 0.17	$ 0.20	$ 0.56	$ 0.57
Loss from discontinued operations, net of income taxes
Net income	$ 0.17	$ 0.20	$ 0.56	$ 0.57
Weighted-average shares outstanding:
Basic	29,562	26,272	29,432	24,105
Diluted	30,168	27,324	30,057	24,911
Comprehensive income:
Net income	5,245	5,378	16,943	14,191
Foreign currency translation adjustments	(12)	62	26	301
Total comprehensive income	$ 5,233	$ 5,440	$ 16,969	$ 14,492