Consolidated Statements of Equity (USD $) In Thousands, unless otherwise specified	Total		Noncontrolling Interest [Member]	Parent [Member]		Class A Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]		Accumulated Other Comprehensive Income (loss) [Member]
Balance at Aug. 31, 2009	$ 922,750		$ 3,383	$ 919,367		$ 21,402	$ 6,268		$ 894,243		$ (2,546)
Balance, shares at Aug. 31, 2009						21,402	6,268
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	70,676		3,926	66,750					66,750
Foreign currency translation adjustment, net of tax	523			523							523
Pension obligations, net	(949)			(949)							(949)
Change in net unrealized gain (loss) on cash flow hedges, net of tax	420			420							420
Comprehensive income	70,670		3,926	66,744
Distributions to noncontrolling interests	(3,003)		(3,003)
Share repurchases, shares						(413)
Share repurchases	(17,147)			(17,147)		(413)		(6,266)	(10,468)
Class A common stock issued, shares						13
Class A common stock issued						13		(13)
Restricted stock withheld for taxes, shares						(81)
Restricted stock withheld for taxes	(3,599)			(3,599)		(81)		(3,518)
Issuance of restricted stock, shares						196
Issuance of restricted stock						196		(196)
Stock options exercised, shares	36					36
Stock options exercised	937			937		36		901
Class B common stock converted to Class A common stock, shares						1,547	(1,547)
Class B common stock converted to Class A common stock						1,547	(1,547)
Share-based compensation expense	11,035			11,035				11,035
Excess tax deficiency from stock options exercised and restricted stock units vested	(128)			(128)				(128)
Cash dividends	(1,883)			(1,883)					(1,883)
Balance at Aug. 31, 2010	979,632		4,306	975,326		22,700	4,721	1,815	948,642		(2,552)
Balance, shares at Aug. 31, 2010						22,700	4,721
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	123,536			118,355					118,355
Net Income	123,436		5,081
Foreign currency translation adjustment, net of tax	3,032			3,032							3,032
Pension obligations, net	969			969							969
Change in net unrealized gain (loss) on cash flow hedges, net of tax	91			91							91
Comprehensive income	127,528		5,081	122,447
Distributions to noncontrolling interests	(2,863)		(2,863)
Share repurchases, shares						(254)
Share repurchases	(10,303)			(10,303)		(254)		(10,049)
Restricted stock withheld for taxes, shares						(70)
Restricted stock withheld for taxes	(3,800)			(3,800)		(70)		(3,730)
Issuance of restricted stock, shares						185
Issuance of restricted stock						185		(185)
Stock options exercised, shares	19					19
Stock options exercised	567			567		19		548
Class B common stock converted to Class A common stock, shares						1,661	(1,661)
Class B common stock converted to Class A common stock						1,661	(1,661)
Share-based compensation expense	12,830			12,830				12,830
Excess tax deficiency from stock options exercised and restricted stock units vested	(467)			(467)				(467)
Cash dividends	(1,888)			(1,888)					(1,888)
Balance at Aug. 31, 2011	1,101,236		6,524	1,094,712		24,241	3,060	762	1,065,109		1,540
Balance, shares at Aug. 31, 2011						24,241	3,060
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,917
Net Income	30,080		2,676	27,404	[1]				27,404	[1]
Foreign currency translation adjustment, net of tax	(1,793)	[2]		(1,793)	[2]						(1,793)	[2]
Pension obligations, net	(2,220)			(2,220)							(2,220)
Change in net unrealized gain (loss) on cash flow hedges, net of tax	(116)			(116)							(116)
Comprehensive income	25,951		2,676	23,275
Distributions to noncontrolling interests	(4,087)		(4,087)
Share repurchases, shares						(1,124)
Share repurchases	(33,194)			(33,194)		(1,124)		(6,570)	(25,500)
Restricted stock withheld for taxes, shares						(69)
Restricted stock withheld for taxes	(2,307)			(2,307)		(69)		(2,238)
Issuance of restricted stock, shares						199
Issuance of restricted stock						199		(199)
Stock options exercised, shares	25					25
Stock options exercised	608			608		25		583
Class B common stock converted to Class A common stock, shares						1,947	(1,947)
Class B common stock converted to Class A common stock						1,947	(1,947)
Share-based compensation expense	9,618			9,618				9,618
Excess tax deficiency from stock options exercised and restricted stock units vested	(1,140)			(1,140)				(1,140)
Cash dividends	(10,989)			(10,989)					(10,989)
Balance at Aug. 31, 2012	$ 1,085,696		$ 5,113	$ 1,080,583		$ 25,219	$ 1,113	$ 816	$ 1,056,024		$ (2,589)
Balance, shares at Aug. 31, 2012						25,219	1,113

[1] Net income attributable to noncontrolling interests at August 31, 2012 and 2011 excludes $(1,163) thousand and $100 thousand, respectively, allocable to the redeemable noncontrolling interest, which is reported in the mezzanine section of the Consolidated Balance Sheets at August 31, 2012 and 2011. See Note 13 - Redeemable Noncontrolling Interest for further detail.

[2] Foreign currency translation adjustments for the years ended August 31, 2012 and 2011 exclude $350 thousand and $(509) thousand, respectively, relating to the redeemable noncontrolling interest, which is reported in the mezzanine section of the Consolidated Balance Sheets at August 31, 2012 and 2011. See Note 13 - Redeemable Noncontrolling Interest for further detail.