Consolidated Statement 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, 2009	$ 592	$ 522,691	$ (208,659)	$ 694,791	$ 105,777		$ 1,115,192
Beginning 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
Net income				190,085		190,085	190,085
Foreign currency translation adjustments					(20,148)	(20,148)	(20,148)
Unrealized gain/(loss) on investment securities					746	746	746
Comprehensive income						170,683
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
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, shares (note 11)	189,000
Common stock issued on employee stock purchase plan (note 11)	1	8,236					8,237
Common stock issued on employee stock purchase plan, shares (note 11)	305,000
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
Net income				226,986		226,986	226,986
Foreign currency translation adjustments					238,057	238,057	238,057
Comprehensive income						465,043
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)
Common stock issued on exercise of options (note 11)	13	56,337					56,350
Common stock issued on exercise of options, shares (note 11)	3,271,000						3,271,429
Common stock issued on vesting of restricted stock units, net of shares withheld for tax (note 11)	1	(3,279)					(3,278)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares (note 11)	329,000
Common stock issued on employee stock purchase plan (note 11)	1	8,783					8,784
Common stock issued on employee stock purchase plan, shares (note 11)	369,000
Treasury stock purchases	(54)		(391,201)				(391,255)
Treasury stock purchases, shares			(13,617,000)
Tax benefit from exercise of options		8,620					8,620
Stock-based compensation costs		30,795					30,795
Net income				254,850		254,850	254,850
Foreign currency translation adjustments					(87,976)	(87,976)	(87,976)
Comprehensive income						166,874
Ending balance at Jun. 30, 2012	$ 568	$ 899,717	$ (895,826)	$ 1,366,712	$ 236,456		$ 1,607,627
Ending balance, shares at Jun. 30, 2012	169,753,000		(27,732,000)