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Stockholders' Equity and Stock-Based Compensation - Restricted Stock Unit Activity (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 29, 2018
Sep. 24, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Tax benefit related to stock based compensation $ 22.6 $ 11.7 $ 23.1
Number of Shares (in millions)      
Non-vested at September 30, 2017   3.0  
Granted   1.7  
Vested   (1.6)  
Forfeited   (0.4)  
Non-vested at September 29, 2018 3.0 2.7  
Weighted-Average Grant-Date Fair Value      
Non-vested at September 30, 2017   $ 34.58  
Granted   42.49  
Vested   34.10  
Forfeited   38.28  
Non-vested at September 29, 2018 $ 34.58 $ 40.02