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Benefit Plans - Additional Information (Details)
shares in Millions, $ in Billions
3 Months Ended
Dec. 29, 2018
USD ($)
shares
Dec. 30, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares reserved for future issuance under stock plans (in shares) | shares 237.9  
Total unrecognized compensation cost related to RSUs and stock options $ 14.0  
Total unrecognized compensation cost related to RSUs and stock options, weighted-average recognition period 2 years 11 months  
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 $ 4.1 $ 3.1