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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 USD ($) $ / shares shares | Jan. 31, 2019 USD ($) | Jan. 31, 2020 USD ($) vote $ / shares shares | Jan. 31, 2019 USD ($) shares | Jul. 31, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance (in shares) | shares | 25,100,000 |  | 25,100,000 |  |
Shares available for grant (in shares) | shares | 20,600,000 |  | 20,600,000 |  |
Exercised, aggregate intrinsic value |  |  | $ 62,182 |  |
Granted (in shares) | shares |  |  | 150,000 |  |
Vesting of early exercised common stock options | $ 131 | $ 277 | $ 262 | $ 567 |
Outstanding notes receivable, carrying amount |  | 1,900 |  | 1,900 |
Interest receivable |  | 200 |  | 200 |
Unrecognized compensation cost | 239,700 |  | $ 239,700 |  |
Unrecognized compensation cost, weighted-average |  |  | 2 years 10 months 24 days |  |
Capitalized stock-based compensation | $ 2,000 |  | $ 1,200 |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercised, aggregate intrinsic value |  |  | $ 62,200 | $ 129,600 |
Weighted average grant date fair value (in dollars per share) | $ / shares |  |  | $ 22.76 |  |
Granted (in shares) | shares |  |  |  | 0 |
Restricted stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 4 years |  |
Performance stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance shares outstanding (in shares) | shares | 400,000 |  | 400,000 |  |
Employee Stock | 2018 Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance (in shares) | shares | 4,700,000 |  | 4,700,000 |  |
Shares available for grant (in shares) | shares | 3,300,000 |  | 3,300,000 |  |
Duration of offering period |  |  | 24 months |  |
Number of purchases periods | vote |  |  | 4 |  |
Duration of purchase periods |  |  | 6 months |  |
Shares issued (in shares) | shares | 300,000 |  |  |  |
Average purchase price per share (in dollars per share) | $ / shares | $ 18.80 |  | $ 18.80 |  |
Cash proceeds from the issuance of common stock |  |  | $ 5,300 |  |
Accrued compensation | $ 2,600 |  | $ 2,600 |  | $ 2,100
Vesting one year from vesting commencing date | Restricted stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights, percentage |  |  | 25.00% |  |
Additional Paid-In Capital |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting of early exercised common stock options | $ 131 | $ 277 | $ 262 | $ 567 |
Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock subject to repurchase (in shares) | shares | 63,000 |  | 63,000 |  | 122,000
Shares subject to repurchase, value | $ 300 |  | $ 300 |  | $ 600

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