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Benefit Plans (Tables) | 6 Months Ended
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Mar. 31, 2018
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 the six months ended March 31, 2018 is as follows:
| Number of RSUs (in thousands) |  | Weighted-Average Grant Date Fair Value Per RSU |  | Aggregate Fair Value (in millions)
Balance as of September 30, 2017 | 97,571 |  |  | $ | 110.33 |  |  |
RSUs granted | 40,184 |  |  | $ | 159.25 |  |  |
RSUs vested | (22,348 | ) |  | $ | 103.66 |  |  |
RSUs canceled | (3,023 | ) |  | $ | 123.28 |  |  |
Balance as of March 31, 2018 | 112,384 |  |  | $ | 128.80 |  |  | $ | 18,856 |
Summary of Share-Based Compensation Expense | The following table shows a summary of the share-based compensation expense included in the Condensed Consolidated Statements of Operations for the three- and six-month periods ended March 31, 2018 and April 1, 2017 (in millions):
| Three Months Ended |  | Six Months Ended
| March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
Cost of sales | $ | 257 |  |  | $ | 217 |  |  | $ | 509 |  |  | $ | 446 |
Research and development | 666 |  |  | 575 |  |  | 1,312 |  |  | 1,164 |
Selling, general and administrative | 425 |  |  | 425 |  |  | 823 |  |  | 863 |
Total share-based compensation expense | $ | 1,348 |  |  | $ | 1,217 |  |  | $ | 2,644 |  |  | $ | 2,473 |

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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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