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Note 4 (Tables)
6 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended March 31, 2018
 
   
Income
   
Shares
   
Per Share
 
   
(Numerator)
   
(Denominator)
   
Amount
 
                         
   
(in thousands, except per share amounts)
 
Basic EPS
                       
Net Earnings available to common stockholders
  $
17,833
     
18,685
    $
0.95
 
                         
Effect of Dilutive Securities
                       
Options
   
-
     
118
     
-
 
                         
Diluted EPS
                       
Net Earnings available to common stockholders plus assumed conversions
  $
17,833
     
18,803
    $
0.95
 
   
Six Months Ended March 31, 2018
 
   
Income
   
Shares
   
Per Share
 
   
(Numerator)
   
(Denominator)
   
Amount
 
                         
   
(in thousands, except per share amounts)
 
Basic EPS
                       
Net Earnings available to common stockholders
  $
54,082
     
18,675
    $
2.90
 
                         
Effect of Dilutive Securities
                       
Options
   
-
     
115
     
(0.02
)
                         
Diluted EPS
                       
Net Earnings available to common stockholders plus assumed conversions
  $
54,082
     
18,790
    $
2.88
 
   
Three Months Ended March 25,2017
 
   
Income
   
Shares
   
Per Share
 
   
(Numerator)
   
(Denominator)
   
Amount
 
                         
   
(in thousands, except per share amounts)
 
Basic EPS
                       
Net Earnings available to common stockholders
  $
15,987
     
18,711
    $
0.85
 
                         
Effect of Dilutive Securities
                       
Options
   
-
     
110
     
-
 
                         
Diluted EPS
                       
Net Earnings available to common stockholders plus assumed conversions
  $
15,987
     
18,821
    $
0.85
 
   
Six Months Ended March 25, 2017
 
   
Income
   
Shares
   
Per Share
 
   
(Numerator)
   
(Denominator)
   
Amount
 
                         
   
(in thousands, except per share amounts)
 
Basic EPS
                       
Net Earnings available to common stockholders
  $
29,527
     
18,698
    $
1.58
 
                         
Effect of Dilutive Securities
                       
Options
   
-
     
106
     
(0.01
)
                         
Diluted EPS
                       
Net Earnings available to common stockholders plus assumed conversions
  $
29,527
     
18,804
    $
1.57