Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock	Noncontrolling Interests
Balance at Aug. 31, 2010	$ 1,592,772	$ 220	$ 1,541,507	$ 123,303	$ 122,062	$ (209,046)	$ 14,726
Balance, shares at Aug. 31, 2010	210,496,989	210,496,989
Shares issued upon exercise of stock options	12,129	1	12,128
Shares issued upon exercise of stock options, shares		857,664
Shares issued under employee stock purchase plan	5,649	1	5,648
Shares issued under employee stock purchase plan, shares		506,250
Issuance and vesting of restricted stock awards		2	(2)
Issuance and vesting of restricted stock awards, shares		2,774,115
Purchases of treasury stock under employee stock plans	(9,739)					(9,739)
Purchases of treasury stock under employee stock plans, shares		(680,224)
Recognition of stock-based compensation	59,660		59,660
Tax benefit of options exercised	62		62
Declared dividends	(47,353)			(47,353)
Comprehensive income	335,543			266,775	68,126		642
Foreign currency adjustments attributable to noncontrolling interests	652						652
Balance at May. 31, 2011	$ 1,949,375	$ 224	$ 1,619,003	$ 342,725	$ 190,188	$ (218,785)	$ 16,020
Balance, shares at May. 31, 2011	213,954,794	213,954,794