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Stockholders' Equity - Narrative (Details) shares in Thousands, $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 26, 2018 USD ($) | Apr. 30, 2019 USD ($) plan shares | Apr. 30, 2018 USD ($) | Jan. 31, 2019 shares | Feb. 01, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of stock-based compensation plans | plan |  | 3 |  |  |
Unrecognized compensation cost, options | $ |  | $ 11,000 |  |  |
Employee stock purchase plan, compensation expense | $ |  | $ 42,271 | $ 269,794 |  |
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost, remaining weighted-average period for recognition |  | 1 year 7 months 6 days |  |  |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost, remaining weighted-average period for recognition |  | 2 years 2 months 12 days |  |  |
Service period |  | 4 years |  |  |
Accelerated share based compensation expense | $ | $ 262,800 |  |  |  |
Shares granted (in shares) |  | 1,174 |  |  |
Unrecognized compensation cost, RSUs | $ |  | $ 51,200 |  |  |
RSUs with vesting conditions |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted (in shares) |  |  |  | 700 |
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee stock purchase plan, shares purchased (in shares) |  | 200 |  |  |
Employee stock purchase plan, compensation expense | $ |  | $ 1,900 |  |  |
2018 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Reserved for future issuance (in shares) |  | 26,800 |  |  |
Annual increase in shares reserved, percentage of total shares |  | 5.00% |  |  |
Number of shares reserved for future issuance |  |  |  |  | 8,500
2018 ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Reserved for future issuance (in shares) |  | 5,300 |  | 3,800 |
Annual increase in shares reserved, percentage of total shares |  |  |  | 1.00% |
Employee contribution, maximum percentage of earnings |  |  |  | 15.00% |
Employee stock purchase plan, purchase price of common stock, percent of market price |  |  |  | 85.00% |
Employee stock purchase plan offering period |  | 6 months |  |  |

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