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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