EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Earnings Per Share [Abstract]
Net income from continuing operations	$ 21,195	$ 21,320	$ 66,677	$ 71,030
Less: Allocation of income to unvested stockholders	(257)	(348)	(856)	(1,296)
Net earnings available to common stockholders	$ 20,938	$ 20,972	$ 65,821	$ 69,734
Basic weighted average shares outstanding	29,883	29,784	29,834	29,733
Add dilutive effect of stock options (two-class method)	5	8	7	10
Diluted average shares outstanding	29,888	29,792	29,841	29,743
Basic income per share from continuing operations	$ 0.70	$ 0.70	$ 2.20	$ 2.35
Diluted income per share from continuing operations	$ 0.70	$ 0.70	$ 2.20	$ 2.34