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Benefit Plans - Additional Information (Details)
shares in Millions, $ in Billions
3 Months Ended 9 Months Ended
Jun. 29, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Jun. 29, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for future issuance under stock plans (in shares) | shares 247.8   247.8  
Total unrecognized compensation cost related to RSUs and stock options $ 11.6   $ 11.6  
Total unrecognized compensation cost related to RSUs and stock options, weighted-average recognition period     2 years 7 months 6 days  
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs granted, vesting period     4 years  
Number of shares of common stock issued per RSU upon vesting     1  
Factor by which each RSU granted reduces, and each RSU canceled or share withheld for taxes increases, the number of shares available for grant     2  
Fair value of RSUs as of the respective vesting dates $ 3.7 $ 3.3 $ 8.1 $ 6.9