Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2012		Aug. 31, 2011		Aug. 31, 2010
Revenues	$ 805,793	[1]	$ 726,510	[1]	$ 641,059	[1]
Operating expenses
Cost of services	275,537		244,623		206,550
Selling, general and administrative	257,266		243,552		212,875
Total operating expenses	532,803		488,175		419,425
Operating income	272,990		238,335		221,634
Other income	1,715		623		547
Income before income taxes	274,705		238,958		222,181
Provision for income taxes	85,896		67,912	[2]	71,970	[3]
Net income	$ 188,809		$ 171,046		$ 150,211
Basic earnings per common share (in Dollars per share)	$ 4.22		$ 3.72		$ 3.22
Diluted earnings per common share (in Dollars per share)	$ 4.12		$ 3.61		$ 3.13
Weighted average common shares (Basic) (in Shares)	44,784		45,953		46,698
Weighted average common shares (Diluted) (in Shares)	45,810		47,355		48,004

[1] Revenues are attributed to countries based on the location of the client.

[2] Includes income tax benefits of $6.3 million from the finalization of the fiscal 2010 tax return and the reenactment of the U.S. Federal R&D tax credit in December 2010. The fiscal 2011 annual effective tax rate before discrete items of $6.3 million was 30.9% or 40 basis points lower than the 2012 effective tax rate due to the expiration of the U.S. Federal R&D tax credit on December 31, 2011, which negatively impacted the fiscal 2012 annual effective tax rate by 130 basis points.

[3] Includes income tax benefits of $1.3 million from the finalization of the fiscal 2009 tax return, adjustments to certain reserves to reflect the lapse of statute of limitations and higher levels of non-U.S. taxable income. The fiscal 2010 annual effective tax rate before discrete items of $1.3 million was 32.9%.