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Earnings Per Share (Tables)
 12 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share:
 
  
Year Ended September 30,
 
 
2020
 
  
2019
 
  
2018
 
Numerator:
   
     
     
 
Net income
  $
497,840
    $
479,446
    $
354,396
 
Net income and dividends attributable to participating restricted shares
   
(3,663
 )    
(3,295
 )    
(2,650
 )
                         
Numerator for basic earnings per common share
  $
494,177
    $
476,151
    $
351,746
 
                         
Undistributed income allocated to participating restricted shares
   
2,417
     
2,252
     
1,617
 
Undistributed income reallocated to participating restricted shares
   
(2,406
 )    
(2,240
 )    
(1,603
 )
                         
Numerator for diluted earnings per common share
  $
494,188
    $
476,163
    $
351,760
 
                         
Denominator:
   
     
     
 
Weighted average number of shares outstanding — basic
    
133,590
     
137,418
     
142,422
 
Weighted average number of participating restricted shares
   
(983
 )    
(944
 )    
(1,065
 )
                         
Weighted average number of common shares — basic
    
132,607
     
136,474
     
141,357
 
                         
Effect of dilutive stock options granted
   
642
     
691
     
1,282
 
Weighted average number of common shares — diluted
    
133,249
     
137,165
     
142,639
 
                         
Basic earnings per common share
  $
3.73
    $
3.49
    $
2.49
 
                         
Diluted earnings per common share
  $
3.71
    $
3.47
    $
2.47