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Redeemable Convertible Preferred Stock and Redeemable Convertible A-1 Common Stock (Details)
$ in Millions
1 Months Ended
Dec. 31, 2020
USD ($)
shares
Oct. 31, 2021
shares
Jul. 31, 2021
shares
Apr. 30, 2021
shares
Oct. 31, 2020
shares
Jul. 31, 2020
shares
Apr. 30, 2020
shares
Redeemable Convertible Preferred Stock, Excluding Series A Preferred Stock              
Temporary Equity [Line Items]              
Conversion of stock, converted (in shares) 33,628,776            
Conversion ratio 1            
Series A Preferred Stock              
Temporary Equity [Line Items]              
Conversion of stock, converted (in shares) 3,499,992            
Conversion ratio 1            
Redeemable Convertible Preferred Stock              
Temporary Equity [Line Items]              
Carrying value reclassified into stockholders' equity | $ $ 399.8            
Shares issued (in shares)   0          
Shares outstanding (in shares)   0 0 0 37,129,000 37,129,000 37,129,000
Redeemable Convertible A-1 Common Stock              
Temporary Equity [Line Items]              
Conversion of stock, converted (in shares) 6,666,665            
Conversion ratio 1            
Carrying value reclassified into stockholders' equity | $ $ 18.8            
Shares issued (in shares)   0          
Shares outstanding (in shares)   0 0 0 6,667,000 6,667,000 6,667,000