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Benefit Plans - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 25, 2016 USD ($) $ / shares shares | Jun. 27, 2015 USD ($) | Jun. 25, 2016 USD ($) $ / shares shares | Jun. 27, 2015 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Shares reserved for future issuance under stock plans (in shares) | shares | 386,300,000 |  | 386,300,000 |
RSUs granted vesting period |  |  | 4 years |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of vested RSUs as of vesting date | $ 2,000 | $ 2,300 | $ 4,500 | $ 4,300
Stock options outstanding (in shares) | shares | 1,100,000 |  | 1,100,000 |
Stock options, weighted average exercise price per share (in USD per share) | $ / shares | $ 15.69 |  | $ 15.69 |
Stock options, weighted average remaining contractual term |  |  | 3 years 4 months 12 days |
Stock options, aggregate intrinsic value | $ 84 |  | $ 84 |
Income tax benefit related to share-based compensation expense | 321 | $ 286 | 1,100 | $ 948
Total unrecognized compensation cost on stock options and RSUs | $ 8,300 |  | $ 8,300 |
Total unrecognized compensation cost on stock options and RSUs, weighted-average recognition period (in years) |  |  | 2 years 8 months 24 days |
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of common stock issued per RSU upon vesting |  |  | 1 |
Reduction in number of shares available for grant per share issued with respect to RSUs granted | shares |  |  | 2 |
Increase in number of shares available for grant per RSU cancelled or withheld for tax withholding |  |  | 2 |
Employee Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Impact on shares available for grant per stock option granted |  |  | 1 |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Increase in Number of Shares Available for Grant Per Share Cancelled or Withheld + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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