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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 28, 2023 | Jan. 29, 2022 | Jan. 28, 2023 | Jan. 29, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Period of average share price |  |  | 7 days |
Stock-based compensation expense, increase (decrease) | $ (4.4) |  |  |
Unrecognized compensation expense related to unvested options and RSUs, net of forfeitures | 175.3 |  | $ 175.3 |
Unrecognized compensation expense related to unvested options weighted average recognition period |  |  | 2 years 2 months 12 days |
Weighted-average grant date fair value of options (in dollars per share) |  |  | $ 2.42 | $ 9.11
Employees |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense, increase (decrease) | $ 25.9 | $ 32.4 | $ 57.6 | $ 64.7
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercisable period |  |  | 10 years |
2011 Equity Incentive Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee stock options vesting percentage |  |  | 25.00% |
Award vesting period |  |  | 3 years |
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) | 38,257,771 |  | 38,257,771 |
2017 Incentive Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercisable period |  |  | 10 years |
2017 Incentive Plan | Stock Options | First Anniversary |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 6 months |
2017 Incentive Plan | Stock Options | Second Anniversary |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 30 months |
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 |

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