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Income Taxes - Additional Information (Detail) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 11, 2014 Subsidiary | Sep. 26, 2015 USD ($) | Sep. 27, 2014 USD ($) | Sep. 28, 2013 USD ($) | Sep. 29, 2012 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |
Foreign pretax earnings |  | $ 47,600 | $ 33,600 | $ 30,500 |
Statutory tax rate in foreign operations |  | 12.50% |  |  |
Undistributed earnings of foreign subsidiaries |  | $ 91,500 |  |  |
Deferred tax liability related to foreign earnings that may be repatriated |  | 30,000 |  |  |
Cash, cash equivalents and marketable securities held by foreign subsidiaries |  | $ 186,900 | $ 137,100 |  |
Reconciliation of provision for income taxes, statutory federal income tax rate |  | 35.00% | 35.00% | 35.00% |
Tax benefits from equity awards |  | $ 748 | $ 706 | $ 643 |
Measurement of tax position, minimum likelihood of tax benefits being realized upon ultimate settlement, percentage |  | 50.00% |  |  |
Gross unrecognized tax benefits |  | $ 6,900 | 4,033 | 2,714 | $ 2,062
Gross unrecognized tax benefits that would affect effective tax rate, if recognized |  | 2,500 | 1,400 |  |
Unrecognized tax benefits, gross interest and penalties accrued |  | 1,300 | 630 |  |
Recognized interest and penalty expense of tax matters |  | $ 709 | $ 40 | $ 189 |
European Commission |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income Tax Contingency, Number of Subsidiaries | Subsidiary | 2 |  |  |  |
European Commission | Maximum |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income Tax Contingency, Period of Occurrence | 10 years |  |  |  |

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