Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Operations [Abstract]
Net revenues	$ 67,959	$ 55,513	$ 117,081	$ 107,621
Cost of revenues	27,046	23,873	46,252	45,321
Gross margin	40,913	31,640	70,829	62,300
Operating expenses:
Selling, general and administrative	14,419	14,019	28,064	28,216
Research and development	11,724	10,479	23,589	21,378
Amortization of acquired intangible assets	692	317	1,508	636
Acquisition costs and other related expenses	593	307	618	307
Total operating expenses	27,428	25,122	53,779	50,537
Income from operations	13,485	6,518	17,050	11,763
Interest income	3	6	9	13
Interest expense	(9)	(49)	(18)	(58)
Other income, net	394	404	799	920
Income from continuing operations before income taxes	13,873	6,879	17,840	12,638
Income taxes	4,828	1,696	6,142	3,773
Income from continuing operations	9,045	5,183	11,698	8,865
Loss from discontinued operations, net of income taxes				(52)
Net income	9,045	5,183	11,698	8,813
Basic net earnings (loss) per share:
Income from continuing operations	$ 0.31	$ 0.22	$ 0.40	$ 0.39
Loss from discontinued operations, net of income taxes				$ (0.01)
Net income	$ 0.31	$ 0.22	$ 0.40	$ 0.38
Diluted net earnings (loss) per share:
Income from continuing operations	$ 0.30	$ 0.22	$ 0.39	$ 0.37
Loss from discontinued operations, net of income taxes
Net income	$ 0.30	$ 0.22	$ 0.39	$ 0.37
Weighted-average shares outstanding:
Basic	29,457	23,099	29,367	23,021
Diluted	29,969	23,998	30,001	23,704
Comprehensive income:
Net income	9,045	5,183	11,698	8,813
Foreign currency translation adjustments	(20)	73	38	239
Total comprehensive income	$ 9,025	$ 5,256	$ 11,736	$ 9,052