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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following table shows the computation of basic and diluted earnings per share for 2017, 2016 and 2015 (net income in millions and shares in thousands):
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net income
$
48,351

 
$
45,687

 
$
53,394

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average shares outstanding
5,217,242

 
5,470,820

 
5,753,421

Effect of dilutive securities
34,450

 
29,461

 
39,648

Weighted-average diluted shares
5,251,692

 
5,500,281


5,793,069

 
 
 
 
 
 
Basic earnings per share
$
9.27

 
$
8.35

 
$
9.28

Diluted earnings per share
$
9.21

 
$
8.31

 
$
9.22