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Employee Stock Plans - Summary of Share-Based Awards Available for Grant (Detail) - shares
shares in Millions
12 Months Ended
Sep. 30, 2016
Oct. 02, 2015
Sep. 26, 2014
Shares Available for Grant      
Beginning balance (in shares) 6.7 8.2 9.9
Granted (in shares) (2.4) (1.8) (1.9)
Canceled or expired (in shares) 0.3 0.3 0.2
Ending balance (in shares) 4.6 6.7 8.2