Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Revenues	$ 312,120	$ 287,501	$ 894,537	$ 839,801
Operating expenses
Cost of services	146,426	124,602	405,311	363,249
Selling, general and administrative	78,052	73,609	219,519	214,610
Total operating expenses	224,478	198,211	624,830	577,859
Operating income	87,642	89,290	269,707	261,942
Other expense
Loss on sale of business			(1,223)
Interest expense, net of interest income	(2,413)	(433)	(3,945)	(765)
Total other expense	(2,413)	(433)	(5,168)	(765)
Income before income taxes	85,229	88,857	264,539	261,177
Provision for income taxes	19,815	22,076	65,832	66,669
Net income	$ 65,414	$ 66,781	$ 198,707	$ 194,508
Basic earnings per common share (in dollars per share)	$ 1.66	$ 1.64	$ 5.03	$ 4.73
Diluted earnings per common share (in dollars per share)	$ 1.66	$ 1.62	$ 5	$ 4.68
Basic weighted average common shares (in shares)	39,317	40,779	39,528	41,094
Diluted weighted average common shares (in shares)	39,457	41,189	39,736	41,596