Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Revenues	$ 254,522	$ 231,761	$ 744,990	$ 681,671
Operating expenses
Cost of services	100,686	90,661	297,745	261,165
Selling, general and administrative	68,480	68,063	200,980	197,673
Total operating expenses	169,166	158,724	498,725	458,838
Operating income	85,356	73,037	246,265	222,833
Other income	482	334	1,445	1,018
Income before income taxes	85,838	73,371	247,710	223,851
Provision for income taxes	24,429	21,839	68,843	67,715
Net income	$ 61,409	$ 51,532	$ 178,867	$ 156,136
Basic earnings per common share (in Dollars per share)	$ 1.48	$ 1.22	$ 4.29	$ 3.66
Diluted earnings per common share (in Dollars per share)	$ 1.45	$ 1.21	$ 4.23	$ 3.62
Basic weighted average common shares (in Shares)	41,628	42,166	41,648	42,615
Diluted weighted average common shares (in Shares)	42,297	42,615	42,317	43,170