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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
12 Months Ended 12 Months Ended 36 Months Ended 12 Months Ended 36 Months Ended 12 Months Ended
Sep. 29, 2012
Contract
Sep. 24, 2011
Sep. 25, 2010
Sep. 29, 2012
Apple iPhone
Sep. 29, 2012
Apple iPad
Sep. 29, 2012
Apple iPod touch
Sep. 29, 2012
Apple TV
Sep. 29, 2012
Apple Mac
Sep. 29, 2012
Minimum
Sep. 29, 2012
Minimum
Sep. 29, 2012
Minimum
Machinery and Equipment
Sep. 29, 2012
Maximum
Sep. 29, 2012
Maximum
Sep. 29, 2012
Maximum
Building
Sep. 29, 2012
Maximum
Machinery and Equipment
Sep. 29, 2012
Maximum
Leasehold Improvements
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                                
Deliverable in arrangements 3                              
Estimate of selling price for software upgrade right (USD/unit sold)                   $ 5     $ 25      
Estimated life of hardware device       2 years 2 years 2 years 2 years 4 years                
Advertising expense 1,000,000,000 933,000,000 691,000,000                          
Measurement of tax position, Minimum likelihood of tax benefits being realized upon ultimate settlement Greater than 50%                              
Measurement of tax position, minimum likelihood of tax benefits being realized upon ultimate settlement, percentage 50.00%                              
Potentially dilutive securities excluded from computation of diluted earnings per common share because their effect would have been antidilutive 1.0 1.7 1.6                          
Net fair value of all derivative instruments designated as fair value hedging instruments 0 0 0                          
Estimated useful lives of assets (Years)                     2 years     30 years 5 years 10 years
Estimated useful life of internal use software                 3 years     5 years        
Depreciation and amortization expense 2,600,000,000 1,600,000,000 815,000,000                          
Goodwill impairment charges 0 0 0                          
Intangible asset impairment charges $ 0 $ 0 $ 0                          
Amortized acquired intangible assets with definite lives period (in years)                 3 years     7 years