EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Earnings Per Share [Abstract]
Net income from continuing operations	$ 28,278	$ 24,882	$ 49,710	$ 44,887
Less: Allocation of income to unvested stockholders	(504)	(540)	(932)	(964)
Net earnings available to common stockholders	$ 27,774	$ 24,342	$ 48,778	$ 43,923
Basic weighted average shares outstanding	29,724	29,626	29,707	29,609
Add dilutive effect of stock options (two-class method)	12	10	12	11
Diluted average shares outstanding	29,736	29,636	29,719	29,620
Basic income per share from continuing operations	$ 0.93	$ 0.82	$ 1.64	$ 1.48
Diluted income per share from continuing operations	$ 0.93	$ 0.82	$ 1.64	$ 1.48