Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock and Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Non-controlling Interest [Member]
Shares outstanding at Jun. 30, 2013		42,744,500	(445,028)
Balance at Jun. 30, 2013	$ 373,724	$ 157,712	$ (2,030)	$ (69)	$ 217,930	$ 181
Increase (Decrease) in Stockholders' Equity
Exercise of stock options, shares	2,863,878	2,863,878
Exercise of stock options	$ 23,928	$ 23,928
Issuance of restricted stock awards/units, net of taxes, shares		131,558
Issuance of restricted stock awards/units, net of taxes	(681)	$ (681)
Stock-based compensation	11,062	11,062
Tax benefit resulting from stock option and restricted stock unit transactions	7,041	7,041
Unrealized gains (loss) on investments	6			6
Translation adjustments	0
Net income	54,151				54,157	(6)
Balance at Jun. 30, 2014	$ 469,231	$ 199,062	$ (2,030)	(63)	272,087	175
Shares outstanding at Jun. 30, 2014		45,739,936	(445,028)
Increase (Decrease) in Stockholders' Equity
Exercise of stock options, shares	2,124,401	2,124,401
Exercise of stock options	$ 23,338	$ 23,338
Issuance of restricted stock awards/units, net of taxes, shares		9,407
Issuance of restricted stock awards/units, net of taxes	(175)	$ (175)
Stock-based compensation	13,699	13,699
Tax benefit resulting from stock option and restricted stock unit transactions	11,157	11,157
Unrealized gains (loss) on investments	(8)			(8)
Translation adjustments	(9)			(9)
Net income	101,852				101,863	(11)
Balance at Jun. 30, 2015	$ 619,085	$ 247,081	$ (2,030)	(80)	373,950	164
Shares outstanding at Jun. 30, 2015		47,873,744	(445,028)
Increase (Decrease) in Stockholders' Equity
Exercise of stock options, shares	1,013,430	1,013,430
Exercise of stock options	$ 12,186	$ 12,186
Issuance of restricted stock awards/units, net of taxes, shares		112,543
Issuance of restricted stock awards/units, net of taxes	(1,786)	$ (1,786)
Stock-based compensation	16,131	16,131
Tax benefit resulting from stock option and restricted stock unit transactions	3,727	3,727
Unrealized gains (loss) on investments	6			6
Translation adjustments	(11)			(11)
Net income	72,041				72,021	20
Balance at Jun. 30, 2016	$ 721,379	$ 277,339	$ (2,030)	$ (85)	$ 445,971	$ 184
Shares outstanding at Jun. 30, 2016		48,999,717	(445,028)