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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jan. 27, 2024
Oct. 28, 2023
Jan. 28, 2023
Jan. 27, 2024
Jan. 28, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Period of average share price   7 days      
Unrecognized compensation expense related to unvested options and RSUs, net of forfeitures $ 96.5     $ 96.5  
Unrecognized compensation expense related to unvested options weighted average recognition period       1 year 9 months 18 days  
Weighted-average grant date fair value of options (in dollars per share)       $ 2.51 $ 2.42
Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 21.1   $ 25.3 $ 41.0 $ 56.4
2017 Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant (in shares) 3,093,161     3,093,161  
2017 Incentive Plan | Class A Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for issuance (in shares) 44,038,883     44,038,883  
2019 Inducement Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant (in shares) 913,496     913,496  
2019 Inducement Plan | Class A Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for issuance (in shares) 10,750,000     10,750,000  
Stock Options | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee stock options vesting percentage       25.00%  
Award vesting period       3 years  
Options exercisable period       10 years  
Stock Options | 2017 Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options exercisable period       10 years  
Stock Options | 2017 Incentive Plan | Share-Based Payment Arrangement, Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       6 months  
Stock Options | 2017 Incentive Plan | Share-Based Payment Arrangement, Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       30 months  
Performance-Based Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for issuance (in shares)   848,489