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Net income per share attributable to common stockholders - Antidilutive Securities (Details) - shares
3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially antidilutive securities (in shares) 36,383,155 63,451,818
Convertible preferred stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially antidilutive securities (in shares) 0 32,482,590
Stock options to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially antidilutive securities (in shares) 36,135,411 30,969,228
RSUs    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially antidilutive securities (in shares) 247,744 0