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Stock-Based Compensation - Additional Information (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 16, 2017 | Jul. 31, 2017 | Jan. 31, 2017 | Dec. 31, 2016 | Aug. 03, 2019 | Jul. 28, 2018 | Jul. 29, 2017 | Aug. 04, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage of outstanding stock maximum |  |  |  |  | 5.00% |  |  |
Weighted-average grant date fair value of options granted (in dollars per share) |  |  |  |  | $ 11.60 | $ 8.40 | $ 9.11 |
Grant date fair value of options vested |  |  |  |  | $ 13,100,000 | $ 8,500,000 | $ 2,600,000 |
Aggregate intrinsic value |  |  |  |  | 49,100,000 | 59,600,000 | 17,400,000 |
Income tax benefit related to stock-based compensation |  |  |  |  | 8,900,000 | $ 4,700,000 | $ 1,300,000 |
Unrecognized compensation expense related to unvested options and RSUs, net of forfeitures |  |  |  |  | $ 147,900,000 |  |  |
Unrecognized compensation expense, period for recognition |  |  |  |  | 3 years |  |  |
Stock based compensation related to periods prior to IPO |  |  |  |  | $ 500,000 |  |  |
Shares subject to repurchase (in shares) |  |  |  |  |  | 160,417 | 702,144 |
Aggregate price of shares subject to repurchase |  |  |  |  |  | $ 200,000 | $ 1,200,000 |
Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  | 0 |  |  |
Number of shares available for grant |  |  |  |  | 1,133,258 | 3,743,623 |  |
Term of award |  |  |  |  | 10 years |  |  |
Dividend yield |  |  |  |  | 0.00% | 0.00% | 0.00% |
Cash tender offer |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock based compensation |  |  |  |  |  |  | $ 8,300,000 |
Price per share (in dollars per share) |  |  |  | $ 22.61 |  |  |  |
Percentage of vested holdings permitted for repurchase |  |  |  | 10.00% |  |  |  |
Number of shares issued in transaction |  |  |  | 526,620 |  |  |  |
Consideration |  |  |  | $ 11,900,000 |  |  |  |
Stock sales by current and former employees |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock based compensation |  |  |  |  |  |  | 13,000,000.0 |
Employees |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock based compensation |  |  |  |  | $ 35,200,000 | $ 15,400,000 | 3,400,000 |
Non-Employee |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock based compensation |  |  |  |  | $ 100,000 | $ 100,000 | $ 200,000 |
Certain Members Of Executive Management Team | Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  | 24 months |  |  |  |  |  |
Aggregate grant date fair value |  | $ 14,000,000.0 |  |  |  |  |  |
Stock based compensation related to periods prior to IPO | $ 0 | $ 500,000 |  |  |  |  |  |
25% vested on first anniversary | Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |  |
25% vested on first anniversary | Restricted stock units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |  |
25% vested on second anniversary | Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |  |
25% vested on second anniversary | Restricted stock units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |  |
25% vested on third anniversary | Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |  |
25% vested on third anniversary | Restricted stock units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |  |
25% vested on fourth anniversary | Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |  |
25% vested on fourth anniversary | Restricted stock units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |  |
Common Class B | Certain Members Of Executive Management Team | Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted (in shares) |  | 1,097,463 |  |  |  |  |  |
Series C | Stock sales by current and former employees |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares issued in transaction |  |  | 85,000 |  |  |  |  |
Consideration |  |  | $ 1,900,000 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued for exercised unvested stock options (in shares) |  |  |  |  |  |  | 111,557 |
Common Stock | Stock sales by current and former employees |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares issued in transaction |  |  | 554,799 |  |  |  |  |
Consideration |  |  | $ 12,500,000 |  |  |  |  |
2011 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  | 23,223,374 |
Number of shares available for grant |  |  |  |  |  |  | 2,023,424 |
2017 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  | 17,137,824 | 17,137,824 |  |
Subsequent Event | 2017 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Increase of number of shares available for issuance |  |  |  |  |  |  |  | 5,069,874

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