Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning Balance at Jun. 30, 2009	$ 145,037	$ 224	$ 104,843	$ 39,313	$ 657
Beginning Balance (in shares) at Jun. 30, 2009		22,376,000
Issuance of common stock under employee stock incentive plans (in shares)		455,000
Issuance of common stock under employee stock incentive plans	1,002	5	997
Issuance of common stock under employee stock purchase plan (in shares)		94,000
Issuance of common stock under employee stock purchase plan	847	1	846
Repurchase of common stock (in shares)	(42,000)	(42,000)
Repurchase of common stock	(433)	(1)	(432)
Stock-based compensation	4,016		4,016
Net income	28,358			28,358
Net unrealized gain (loss) on investments	(83)				(83)
Foreign currency translation adjustments	368				368
Ending Balance at Jun. 30, 2010	179,112	229	110,270	67,671	942
Ending Balance (in shares) at Jun. 30, 2010		22,883,000
Issuance of common stock under employee stock incentive plans (in shares)		594,000
Issuance of common stock under employee stock incentive plans	2,596	6	2,590
Issuance of common stock under employee stock purchase plan (in shares)		89,000
Issuance of common stock under employee stock purchase plan	1,094	1	1,093
Follow-on public stock offering (in shares)		5,578,000
Follow-on public stock offering	93,605	55	93,550
Stock-based compensation	5,580		5,580
Tax benefit from employee stock plan awards	694		694
Net income	18,442			18,442
Net unrealized gain (loss) on investments	2				2
Foreign currency translation adjustments	311				311
Ending Balance at Jun. 30, 2011	301,436	291	213,777	86,113	1,255
Ending Balance (in shares) at Jun. 30, 2011	29,143,738	29,144,000
Issuance of common stock under employee stock incentive plans (in shares)		481,000
Issuance of common stock under employee stock incentive plans	466	5	461
Issuance of common stock under employee stock purchase plan (in shares)		104,000
Issuance of common stock under employee stock purchase plan	1,165	1	1,164
Stock-based compensation	6,616		6,616
Tax benefit from employee stock plan awards	751		751
Net income	22,619			22,619
Net unrealized gain (loss) on investments	(2)				(2)
Foreign currency translation adjustments	53				53
Ending Balance at Jun. 30, 2012	$ 333,104	$ 297	$ 222,769	$ 108,732	$ 1,306
Ending Balance (in shares) at Jun. 30, 2012	29,729,065	29,729,000