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Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2015 USD ($) Item | Sep. 26, 2015 USD ($) Item | Sep. 27, 2014 USD ($) | Sep. 28, 2013 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Deliverable in arrangements | Item | 3 | 3 |  |
Advertising expense |  | $ 1,800,000,000 | $ 1,200,000,000 | $ 1,100,000,000
Measurement of tax position, minimum likelihood of tax benefits being realized upon ultimate settlement, percentage | 50.00% | 50.00% |  |
Depreciation and amortization expense |  | $ 9,200,000,000 | 6,900,000,000 | 5,800,000,000
Goodwill impairment charges |  | 0 | 0 | 0
Indefinite lived intangible asset impairment charges |  | $ 0 | $ 0 | $ 0
Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Decrease in estimated selling price for iOS devices and Mac to reflect the increase in competitive offers (USD/unit sold) | $ 5 |  |  |
Amortized acquired intangible assets with definite lives useful period (in years) |  | 3 years |  |
Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Decrease in estimated selling price for iOS devices and Mac to reflect the increase in competitive offers (USD/unit sold) | $ 10 |  |  |
Amortized acquired intangible assets with definite lives useful period (in years) |  | 7 years |  |
Building | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets (Years) |  | 30 years |  |
Machinery and Equipment | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets (Years) |  | 1 year |  |
Machinery and Equipment | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets (Years) |  | 5 years |  |
Leasehold Improvements | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets (Years) |  | 10 years |  |
Internal-Use Software | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets (Years) |  | 3 years |  |
Internal-Use Software | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets (Years) |  | 5 years |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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