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Stock-Based Compensation - Restricted Stock Awards Activity and Price (Detail) - $ / shares
shares in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2016
Oct. 02, 2016
Sep. 27, 2015
Sep. 28, 2014
Restricted Stock Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Restricted Stock Awards        
Outstanding and Nonvested, Balance   3.0 3.1 3.1
Granted   1.3 1.3 1.6
Assumed from acquisition   1.9 0.3  
Vested   (2.1) (1.5) (1.4)
Canceled   (0.5) (0.2) (0.2)
Outstanding and Nonvested, Balance   3.6 3.0 3.1
Weighted- Average Grant Price        
Granted   $ 32.15 $ 29.37 $ 24.67
Assumed from acquisition   $ 29.77 $ 33.01  
Stock Option Plan 2008        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional shares to the shares limit in common stock 4.8