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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

The number of deliverables of an arrangement that are allocated using the relative selling price method.

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Percentage Of Income Tax Examination Minimum Likelihood of Tax Benefits Being Realized Upon Settlement

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Revenue Recognition, Multiple Deliverable Arrangements, Decrease in Selling Price, Amount

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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.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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