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Benefit Plans (Tables)
 12 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Unit Activity
A summary of the Company’s RSU activity and related information for 2017, 2016 and 2015, is as follows:
 
Number of
RSUs
(in thousands)
 
Weighted-Average
Grant Date Fair
Value Per Share
 
Aggregate Fair Value
(in millions)
Balance as of September 27, 2014
103,822

 
$
70.98

 
 
RSUs granted
45,587

 
$
105.51

 
 
RSUs vested
(41,684
)
 
$
71.32

 
 
RSUs canceled
(6,258
)
 
$
80.34

 
 
Balance as of September 26, 2015
101,467

 
$
85.77

 
 
RSUs granted
49,468

 
$
109.28

 
 
RSUs vested
(46,313
)
 
$
84.44

 
 
RSUs canceled
(5,533
)
 
$
96.48

 
 
Balance as of September 24, 2016
99,089

 
$
97.54

 
 
RSUs granted
50,112

 
$
121.65

 
 
RSUs vested
(45,735
)
 
$
95.48

 
 
RSUs canceled
(5,895
)
 
$
106.87

 
 
Balance as of September 30, 2017
97,571

 
$
110.33

 
$
15,038
Summary of Share-Based Compensation Expense
The following table shows a summary of the share-based compensation expense included in the Consolidated Statements of Operations for 2017, 2016 and 2015 (in millions):
 
2017
 
2016
 
2015
Cost of sales
$
877

 
$
769

 
$
575

Research and development
2,299

 
1,889

 
1,536

Selling, general and administrative
1,664

 
1,552

 
1,475

Total share-based compensation expense
$
4,840


$
4,210


$
3,586