Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Revenues	$ 354,895	$ 335,231	$ 706,535	$ 664,372
Operating expenses
Cost of services	165,108	163,232	331,884	324,756
Selling, general and administrative	81,099	76,514	165,424	155,033
Total operating expenses	246,207	239,746	497,308	479,789
Operating income	108,688	95,485	209,227	184,583
Other (expense) income
Interest (expense), net of interest income	(4,339)	(3,272)	(8,935)	(6,191)
Income before income taxes	104,349	92,213	200,292	178,392
Provision for income taxes	19,647	39,076	31,294	54,876
Net income	$ 84,702	$ 53,137	$ 168,998	$ 123,516
Basic earnings per common share (in dollars per share)	$ 2.23	$ 1.36	$ 4.44	$ 3.16
Diluted earnings per common share (in dollars per share)	$ 2.19	$ 1.33	$ 4.37	$ 3.11
Basic weighted average common shares (in shares)	38,055	38,991	38,081	39,038
Diluted weighted average common shares (in shares)	38,619	39,846	38,714	39,763