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EARNINGS PER SHARE (Tables)
 12 Months Ended
Sep. 30, 2018
EARNINGS PER SHARE [Abstract]  
Basic and Diluted Earnings per Share
The standards of accounting for earnings per share require companies to provide a reconciliation of the numerator and denominator of the basic and diluted earnings per share computations.  Basic and diluted earnings per share were calculated as follows:

 
 
Year Ended September 30,
 
 
 
2018
  
2017
  
2016
 
Numerator:
         
Net income
 
$
110,043
  
$
86,952
  
$
59,849
 
Less: income attributable to participating securities
  
(123
)
  
(256
)
  
(361
)
Net income available to common stockholders
 
$
109,920
  
$
86,696
  
$
59,488
 
 
            
Denominator:
            
Weighted-average common shares
  
25,517,825
   
25,015,458
   
24,076,549
 
(Denominator for basic calculation)
            
Weighted-average effect of dilutive securities:
            
Share-based compensation
  
725,339
   
497,029
   
400,444
 
Diluted weighted-average common shares
  
26,243,164
   
25,512,487
   
24,476,993
 
(Denominator for diluted calculation)
            
 
            
Earnings per share:
            
Basic
 
$
4.31
  
$
3.47
  
$
2.47
 
Diluted
 
$
4.19
  
$
3.40
  
$
2.43