CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 9 months ended May 31, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Noncontrolling Interests
Balance at Aug. 31, 2016	$ 2,457,497	$ 250	$ 2,034,525	$ 1,660,820	$ (39,877)	$ (1,217,547)	$ 19,326
Balance (in shares) at Aug. 31, 2016	186,998,472	186,998,472
Shares issued upon exercise of stock options (in shares)		108,941
Shares issued under employee stock purchase plan	$ 11,247	$ 1	11,246
Shares issued under employee stock purchase plan (in shares)		710,832
Vesting of restricted stock awards		$ 2	(2)
Vesting of restricted stock awards (in shares)		2,073,007
Purchases of treasury stock under employee stock plans	(11,558)					(11,558)
Purchases of treasury stock under employee stock plans (in shares)		(526,540)
Treasury shares purchased	(237,135)					(237,135)
Treasury shares purchased (in shares)		(9,901,336)
Recognition of stock-based compensation	33,064		33,064
Declared dividends	(45,527)			(45,527)
Comprehensive (loss) income	136,930			83,411	55,804		(2,285)
Declared dividends to noncontrolling interests	(1,500)						(1,500)
Foreign currency adjustments attributable to noncontrolling interests	(175)						(175)
Balance at May. 31, 2017	$ 2,342,843	$ 253	$ 2,078,833	$ 1,698,704	$ 15,927	$ (1,466,240)	$ 15,366
Balance (in shares) at May. 31, 2017	179,463,376	179,463,376