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EARNINGS PER SHARE Earnings Per Share (Tables)
 6 Months Ended
Feb. 28, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of net income per share for the three and six months ended February 28, 2014 and 2013 (in thousands, except per share amounts):
 
Three Months Ended February 28,
 
Six Months Ended February 28,
 
2014
 
2013
 
2014
 
2013
Net income
$
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 net income per share
$
0.93

 
$
0.82

 
$
1.64

 
$
1.48

Diluted net income per share
$
0.93

 
$
0.82

 
$
1.64

 
$
1.48