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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 |  |  |

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