Consolidated Statements Of Stockholders' Equity And Comprehensive Income (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Comprehensive Income [Member]
Balances at Jun. 30, 2009	$ 434,219	$ 959	$ 550,432	$ 2,768	$ (119,940)
Balances, shares at Jun. 30, 2009		95,896
Issuance of common stock for cash upon exercise of options and employee stock purchase plan	22,305	20	22,285
Issuance of common stock for cash upon exercise of options and employee stock purchase plan, shares		2,090
Share-based payment expense	22,776		22,776
Repurchase and retirement of common stock	(71,393)	(39)	(28,526)		(42,828)
Repurchase and retirement of common stock, shares	(3,940)	(3,940)
Net income	152,303				152,303	152,303
Change in unrealized gains on available-for-sale investment securities, net of tax						(2,629)
Other comprehensive income, net of tax	(2,629)			(2,629)		(2,629)
Comprehensive income						149,674
Balances at Jun. 30, 2010	557,581	940	566,967	139	(10,465)
Balances, shares at Jun. 30, 2010		94,046
Issuance of common stock for cash upon exercise of options and employee stock purchase plan	25,060	20	25,040
Issuance of common stock for cash upon exercise of options and employee stock purchase plan, shares		2,022
Share-based payment expense	25,088		25,088
Stock-based compensation tax benefits	58,831		58,831
Repurchase and retirement of common stock	(200,490)	(98)	(71,517)		(128,875)
Repurchase and retirement of common stock, shares	(9,824)	(9,824)
Net income	100,710				100,710	100,710
Change in unrealized gains on available-for-sale investment securities, net of tax	6					6
Change in foreign currency translation adjustment	6					6
Other comprehensive income, net of tax	12			12		12
Comprehensive income	100,722					100,722
Balances at Jun. 30, 2011	566,792	862	604,409	151	(38,630)
Balances, shares at Jun. 30, 2011	86,244	86,244
Issuance of common stock for cash upon exercise of options and employee stock purchase plan	25,029	21	25,008
Issuance of common stock for cash upon exercise of options and employee stock purchase plan, shares		2,013
Share-based payment expense	26,275		26,275
Stock-based compensation tax benefits	34,193		34,193
Repurchase and retirement of common stock	(128,467)	(57)	(42,205)		(86,205)
Repurchase and retirement of common stock, shares	(5,688)	(5,688)
Net income	112,151				112,151	112,151
Change in unrealized gains on available-for-sale investment securities, net of tax	(135)					(135)
Change in foreign currency translation adjustment	(178)					(178)
Other comprehensive income, net of tax	(313)			(313)		(313)
Comprehensive income	111,838					111,838
Balances at Jun. 30, 2012	$ 635,660	$ 826	$ 647,680	$ (162)	$ (12,684)
Balances, shares at Jun. 30, 2012	82,569	82,569