Consolidated Statements Of Stockholders' Equity And Comprehensive Income (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Comprehensive Income [Member]	Total
Beginning balance at Jun. 30, 2008	$ 590	$ 468,060	$ (142,987)	$ 548,343	$ 207,769		$ 1,081,775
Beginning balance, shares at Jun. 30, 2008	152,481,000		(4,876,000)
Common stock issued on exercise of options (note 11)	7	20,286					20,293
Common stock issued on exercise of options, shares (note 11)	1,848,000
Common stock issued on employee stock purchase plan (note 11)	1	4,733					4,734
Common stock issued on employee stock purchase plan, shares (note 11)	356,000
Treasury stock purchases	(6)		(65,672)				(65,678)
Treasury stock purchases, shares			(1,826,000)
Tax benefit from exercise of options		4,051					4,051
Stock-based compensation costs		25,561					25,561
Comprehensive income:
Net income				146,448		146,448	146,448
Other comprehensive income:
Foreign currency translation adjustments					(101,631)	(101,631)	(101,631)
Unrealized gain/(loss) on investment securities					(361)	(361)	(361)
Comprehensive income						44,456
Ending balance at Jun. 30, 2009	592	522,691	(208,659)	694,791	105,777		1,115,192
Ending balance, shares at Jun. 30, 2009	154,685,000		(6,702,000)
Common stock issued on exercise of options (note 11)	22	88,571					88,593
Common stock issued on exercise of options, shares (note 11)	5,558,000
Common stock issued on employee stock purchase plan (note 11)	1	6,113					6,114
Common stock issued on employee stock purchase plan, shares (note 11)	324,000
Treasury stock purchases	(10)		(135,846)				(135,856)
Treasury stock purchases, shares			(2,520,000)
Tax benefit from exercise of options		13,186					13,186
Stock-based compensation costs		29,624					29,624
Comprehensive income:
Net income				190,085		190,085	190,085
Other comprehensive income:
Foreign currency translation adjustments					(20,148)	(20,148)	(20,148)
Unrealized gain/(loss) on investment securities					746	746	746
Comprehensive income						170,683	86,375
Ending balance at Jun. 30, 2010	605	660,185	(344,505)	884,876	86,375		1,287,536
Ending balance, shares at Jun. 30, 2010	160,567,000		(9,222,000)
Common stock issued on exercise of options (note 11)	19	87,029					87,048
Common stock issued on exercise of options, shares (note 11)	4,723,000						4,722,554
Common stock issued on vesting of restricted stock units, net of shares withheld for tax (note 11)	1	(2,269)					(2,268)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax share (note 11)	189,000
Common stock issued on employee stock purchase plan (note 11)	1
Common stock issued on employee stock purchase plan, shares (note 11)	305,000	8,236,000					8,237,000
Treasury stock purchases	(19)		(160,120)				(160,139)
Treasury stock purchases, shares			(4,893,000)
Tax benefit from exercise of options		14,547					14,547
Stock-based compensation costs		30,733					30,733
Comprehensive income:
Net income				226,986		226,986	226,986
Other comprehensive income:
Foreign currency translation adjustments					238,057	238,057	238,057
Comprehensive income						465,043	324,432
Ending balance at Jun. 30, 2011	$ 607	$ 798,461	$ (504,625)	$ 1,111,862	$ 324,432		$ 1,730,737
Ending balance, shares at Jun. 30, 2011	165,784,000		(14,115,000)