EARNINGS PER SHARE (Schedule of the Computation of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Nov. 30, 2017	Nov. 30, 2016
Net income	$ 22,490	$ 24,869
Less: Allocation of income to unvested stockholders	(300)	(420)
Net earnings available to common stockholders	$ 22,190	$ 24,449
Basic weighted average shares outstanding	30,078	29,982
Add dilutive effect of stock options (two-class method)	1	5
Diluted average shares outstanding	30,079	29,987
Basic net income per share	$ 0.74	$ 0.82
Diluted net income per share	$ 0.74	$ 0.82