Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2014		Aug. 31, 2013		Aug. 31, 2012
Revenues	$ 920,335	[1]	$ 858,112	[1]	$ 805,793	[1]
Operating expenses
Cost of services	353,686		306,379		275,537
Selling, general and administrative	264,430		282,314		257,266
Total operating expenses	618,116		588,693		532,803
Operating income	302,219		269,419		272,990
Other income	1,245		1,491		1,715
Income before income taxes	303,464		270,910		274,705
Provision for income taxes	91,921		72,273		85,896
Net income	$ 211,543		$ 198,637		$ 188,809
Basic earnings per common share (in Dollars per share)	$ 4.98		$ 4.53		$ 4.22
Diluted earnings per common share (in Dollars per share)	$ 4.92		$ 4.45		$ 4.12
Weighted average common shares (Basic) (in Shares)	42,436		43,890		44,784
Weighted average common shares (Diluted) (in Shares)	42,970		44,624		45,810

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