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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Mar. 30, 2019
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 the three- and six-month periods ended March 30, 2019 and March 31, 2018 (net income in millions and shares in thousands):
 
Three Months Ended
 
Six Months Ended
 
March 30,
2019
 
March 31,
2018
 
March 30,
2019
 
March 31,
2018
Numerator:
 
 
 
 
 
 
 
Net income
$
11,561

 
$
13,822

 
$
31,526

 
$
33,887

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average basic shares outstanding
4,674,071

 
5,024,877

 
4,704,945

 
5,068,877

Effect of dilutive securities
26,575

 
43,616

 
32,004

 
44,263

Weighted-average diluted shares
4,700,646

 
5,068,493

 
4,736,949

 
5,113,140

 
 
 
 
 
 
 
 
Basic earnings per share
$
2.47

 
$
2.75

 
$
6.70

 
$
6.69

Diluted earnings per share
$
2.46

 
$
2.73

 
$
6.66

 
$
6.63