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Redeemable Convertible Preferred Stock (Details)
$ / shares in Units, $ in Billions
1 Months Ended 3 Months Ended
Sep. 30, 2020
USD ($)
shares
Feb. 29, 2020
$ / shares
shares
Apr. 30, 2020
shares
Apr. 30, 2021
shares
Jan. 31, 2021
shares
Jan. 31, 2020
shares
Temporary Equity [Line Items]            
Issuance of redeemable convertible preferred stock (in shares)     12,349,827      
Redeemable convertible preferred stock, shares outstanding (in shares)     182,271,099 0 0 169,921,272
Redeemable convertible preferred stock, shares issued (in shares)       0 0  
Series G-1 Redeemable Convertible Preferred Stock            
Temporary Equity [Line Items]            
Issuance of redeemable convertible preferred stock (in shares)   8,480,857        
Redemption price (in dollars per share) | $ / shares   $ 38.77        
Series G-2 Redeemable Convertible Preferred Stock            
Temporary Equity [Line Items]            
Issuance of redeemable convertible preferred stock (in shares)   3,868,970        
Redemption price (in dollars per share) | $ / shares   $ 38.77        
Redeemable Convertible Preferred Stock            
Temporary Equity [Line Items]            
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) (182,271,099)          
Reclassification of converted shares | $ $ (1.4)          
Class B Common Stock            
Temporary Equity [Line Items]            
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) 182,271,099          
Conversion ratio 1          
Carrying value of converted shares | $ $ 1.4