Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Revenues	$ 281,796	$ 247,792	$ 552,300	$ 490,468
Operating expenses
Cost of services	123,911	99,516	238,647	197,059
Selling, general and administrative	72,541	67,628	141,001	132,501
Total operating expenses	196,452	167,144	379,648	329,560
Operating income	85,344	80,648	172,652	160,908
Other (expense) income	(424)	534	(331)	964
Income before income taxes	84,919	81,182	172,321	161,872
Provision for income taxes	17,157	19,584	44,594	44,414
Net income	$ 67,763	$ 61,598	$ 127,727	$ 117,458
Basic earnings per common share (in dollars per share)	$ 1.65	$ 1.48	$ 3.10	$ 2.82
Diluted earnings per common share (in dollars per share)	$ 1.63	$ 1.46	$ 3.06	$ 2.78
Basic weighted average common shares (in shares)	41,117	41,630	41,252	41,658
Diluted weighted average common shares (in shares)	41,536	42,306	41,799	42,324