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Earnings per Share (Tables)
 12 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share
The following table presents reconciliations for the numerators and denominators of basic and diluted earnings per share (“EPS”) during fiscal 2020, 2019 and 2018: 
 
Year Ended September 30,
 
2020
 
2019
 
2018
 
(In thousands, except per share data)
Numerator for basic and diluted earnings per share — net income
$
236,411

 
$
192,124

 
$
126,482

Denominator — share:
 
 
 
 
 
Basic weighted-average shares
29,067

 
28,980

 
29,711

Effect of dilutive securities
865

 
1,314

 
1,469

Diluted weighted-average shares
29,932

 
30,294

 
31,180

Earnings per share:
 
 
 
 
 
Basic
$
8.13

 
$
6.63

 
$
4.26

Diluted
$
7.90

 
$
6.34

 
$
4.06