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Benefit Plans - Additional Information (Details)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Mar. 30, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
Mar. 30, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for future issuance under stock plans (in shares) | shares 235.5   235.5  
Total unrecognized compensation cost related to RSUs and stock options $ 12,800   $ 12,800  
Total unrecognized compensation cost related to RSUs and stock options, weighted-average recognition period     2 years 9 months 18 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, or 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 $ 348 $ 457 $ 4,400 $ 3,600