Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018
Revenues	$ 364,533	$ 339,911	$ 1,071,068	$ 1,004,283
Operating expenses
Cost of services	163,832	165,073	495,716	489,829
Selling, general and administrative	83,461	81,573	248,885	236,606
Total operating expenses	247,293	246,646	744,601	726,435
Operating income	117,240	93,265	326,467	277,848
Other expense
Interest expense, net of interest income	3,856	3,754	12,791	9,945
Income before income taxes	113,384	89,511	313,676	267,903
Provision for income taxes	21,119	14,765	52,413	69,641
Net income	$ 92,265	$ 74,746	$ 261,263	$ 198,262
Basic earnings per common share (in dollars per share)	$ 2.41	$ 1.94	$ 6.85	$ 5.10
Diluted earnings per common share (in dollars per share)	$ 2.37	$ 1.91	$ 6.73	$ 5.01
Basic weighted average common shares (in shares)	38,223	38,594	38,128	38,890
Diluted weighted average common shares (in shares)	38,993	39,104	38,807	39,543