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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Numerator:        
Net income $ 10,677 $ 7,748 $ 42,270 $ 31,043
Denominator:        
Weighted-average shares outstanding 5,729,886 6,012,635 5,788,922 6,136,147
Effect of dilutive securities 43,213 39,076 40,998 36,710
Weighted-average diluted shares 5,773,099 6,051,711 5,829,920 6,172,857
Basic earnings per share $ 1.86 $ 1.29 $ 7.30 $ 5.06
Diluted earnings per share $ 1.85 $ 1.28 $ 7.25 $ 5.03