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EARNINGS PER SHARE Earnings Per Share (Tables)
 6 Months Ended
Feb. 28, 2015
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, 2015 and 2014 (in thousands, except per share amounts):
 
Three Months Ended February 28,
 
Six Months Ended February 28,
 
2015
 
2014
 
2015
 
2014
Net income
$
24,835

 
$
28,278

 
$
45,482

 
$
49,710

Less: Allocation of income to unvested stockholders
(259
)
 
(504
)
 
(580
)
 
(932
)
Net earnings available to common stockholders
$
24,576

 
$
27,774

 
$
44,902

 
$
48,778

Basic weighted average shares outstanding
29,827

 
29,724

 
29,809

 
29,707

Add dilutive effect of stock options (two-class method)
6

 
12

 
7

 
12

Diluted average shares outstanding
29,833

 
29,736

 
29,816

 
29,719

Basic net income per share
$
0.82

 
$
0.93

 
$
1.50

 
$
1.64

Diluted net income per share
$
0.82

 
$
0.93

 
$
1.50

 
$
1.64