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Benefit Plans (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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