EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Nov. 30, 2016	Nov. 30, 2015
EARNINGS PER SHARE [Abstract]
Net income	$ 24,869	$ 23,672
Less: Allocation of income to unvested stockholders	(420)	(334)
Net earnings available to common stockholders	$ 24,449	$ 23,338
Basic weighted average shares outstanding	29,982	29,890
Add dilutive effect of stock options (two-class method)	5	6
Diluted average shares outstanding	29,987	29,896
Basic net income per share	$ 0.82	$ 0.78
Diluted net income per share	$ 0.82	$ 0.78