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Net income per share attributable to common stockholders - Computation of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 06, 2018
Dec. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Earnings Per Share [Abstract]        
Common shares issued in conversion of outstanding shares of redeemable convertible preferred stock (shares) 32,482,590      
Number of shares of common stock issued for each share of redeemable convertible preferred stock (shares) 1      
Numerator:        
Net income   $ 61,667 $ 45,697 $ 45,697
Less: noncumulative dividend to preferred stockholders   0 (7,293)  
Less: undistributed earnings to participating securities   0 (13,670)  
Net loss attributable to common stockholders—basic   61,667 24,734  
Add: undistributed earnings reallocated to holders of common stock   0 1,899  
Net loss attributable to common stockholders—diluted   $ 61,667 $ 26,633  
Denominator:        
Weighted-average shares of common stock - basic (in shares)   100,148,106 58,772,641  
Weighted-average shares of common stock - diluted (in shares)   112,088,672 73,546,144  
Net loss per share attributable to common stockholders:        
Net income per share attributable to common stockholders - basic (in USD per share)   $ 0.62 $ 0.42  
Net income per share attributable to common stockholders - diluted (in USD per share)   $ 0.55 $ 0.36