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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 02, 2020 | Apr. 27, 2019 | May 02, 2020 | Apr. 27, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value of options (in dollars per share) |  |  | $ 11.35 | $ 11.37
Unrecognized compensation expense related to unvested options and RSU’s, net of estimated forfeitures | $ 216.7 |  | $ 216.7 |
Unrecognized compensation expense related to unvested options weighted average recognition period |  |  | 2 years 9 months 18 days |
Employees |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 19.6 | $ 9.1 | $ 47.5 | $ 23.8
2011 Equity Incentive Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Remaining vesting after first anniversary of grant date |  |  | 3 years |
Options exercisable period |  |  | 10 years |
2011 Equity Incentive Plan | Stock Options | First Anniversary |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee stock options vesting percentage |  |  | 25.00% |
2011 Equity Incentive Plan | Stock Options | Second Anniversary |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee stock options vesting percentage |  |  | 25.00% |
2011 Equity Incentive Plan | Stock Options | Third Anniversary |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee stock options vesting percentage |  |  | 25.00% |
2011 Equity Incentive Plan | Stock Options | Fourth Anniversary |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee stock options vesting percentage |  |  | 25.00% |
2017 Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized for issuance (in shares) | 22,207,698 |  | 22,207,698 |
2019 Inducement Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized for issuance (in shares) | 1,750,000 |  | 1,750,000 |

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