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Stockholders' Equity (Details) - Common Stock [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2021 | Oct. 31, 2019 | Apr. 30, 2019
Chief Executive Officer [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Options Exercised |  | 4,000,000 |
Weighted Average Exercise Price |  | $ 17.81 |
Shares Net Settled for Exercise |  | 865,719 |
Shares Withheld for Taxes (1) |  | 1,231,595 |
Net Shares to Employees |  | 1,902,686 |
Weighted Average Share Price for Withholding |  | $ 82.29 |
Employee Stock-Based Tax Withholding (in 000s) |  | $ 101,348 |
President [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Options Exercised |  |  | 3,000,000
Weighted Average Exercise Price |  |  | $ 17.81
Shares Net Settled for Exercise |  |  | 945,162
Shares Withheld for Taxes (1) |  |  | 806,039
Net Shares to Employees |  |  | 1,248,799
Weighted Average Share Price for Withholding |  |  | $ 56.53
Employee Stock-Based Tax Withholding (in 000s) |  |  | $ 45,565
Management |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Options Exercised | 90,000 |  |
Weighted Average Exercise Price | $ 17.73 |  |
Shares Net Settled for Exercise | 12,366 |  |
Shares Withheld for Taxes (1) | 29,349 |  |
Net Shares to Employees | 48,285 |  |
Weighted Average Share Price for Withholding | $ 129.01 |  |
Employee Stock-Based Tax Withholding (in 000s) | $ 3,786 |  |

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