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Preferred and Common Stock- Schedule of Restricted Stock and Restricted Stock Units Granted (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2021 | Jun. 15, 2021 | May 03, 2021 | Sep. 02, 2020 | Dec. 23, 2019 | Sep. 04, 2019 | Jun. 24, 2019 | Jun. 04, 2019 | Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020 | Jun. 04, 2021
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  |  | 154,278 | 209,936 | 189,035 |
Key Employees | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  | 75,959,000 |  |  |  |
Fair Value at Grant Date |  |  |  |  |  |  |  | $ 9,886 |  |  |  |
Officers | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  | 5,053,000 |  |  |  |  | 59,579,000 |  |  |  |
Fair Value at Grant Date |  | $ 1,760 |  |  |  |  |  | $ 9,097 |  |  |  |
Compensation not yet recognized |  |  |  |  |  |  |  |  |  |  |  | $ 2,800
Officers | Stock Incentive Plan | Restricted Stock Units, Performance-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |
Compensation not yet recognized |  |  |  |  |  |  |  | 6,900 | $ 14,000 | $ 25,300 |  |
Compensation not yet recognized, fair value |  |  |  |  |  |  |  | $ 3,400 | $ 13,900 | $ 14,700 |  |
Non-Employee Board Members | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted | 5,275,000 |  |  | 5,240,000 |  | 5,504,000 |  |  |  |  |  |
Fair Value at Grant Date | $ 1,081 |  |  | $ 951 |  | $ 919 |  |  |  |  |  |
CEO | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  | 5,000,000 |  | 32,786,000 |  |  |  |  |
Fair Value at Grant Date |  |  |  |  | $ 788 |  | $ 5,700 |  |  |  |  |
CEO | Stock Incentive Plan | Restricted Stock Units, Time-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Compensation not yet recognized |  |  |  |  |  |  | $ 1,800 |  |  |  |  |
Key Employees and Officers | Stock Incentive Plan | Restricted Stock Units, Performance-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |
Compensation not yet recognized |  |  |  |  |  |  |  |  | $ 2,600 |  |  |
Compensation not yet recognized, fair value |  |  |  |  |  |  |  |  | $ 1,300 |  |  |
Minimum | Officers | Stock Incentive Plan | Restricted Stock Units, Performance-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  |  |  |  | 0.00% |  |  |
Minimum | Officers | Stock Incentive Plan | Restricted Stock Units, Market-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  |  |  |  | 0.00% |  |  |
Minimum | CEO | Stock Incentive Plan | Restricted Stock Units, Time-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  |  |  |  | 0.00% |  |  |
Minimum | Key Employees and Officers | Stock Incentive Plan | Restricted Stock Units, Performance-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  |  |  |  | 0.00% |  |  |
Maximum | Officers | Stock Incentive Plan | Restricted Stock Units, Performance-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  |  |  |  | 200.00% |  |  |
Maximum | Officers | Stock Incentive Plan | Restricted Stock Units, Market-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  |  |  |  | 200.00% |  |  |
Maximum | CEO | Stock Incentive Plan | Restricted Stock Units, Time-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  |  |  |  | 200.00% |  |  |
Maximum | Key Employees and Officers | Stock Incentive Plan | Restricted Stock Units, Performance-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  |  |  |  | 200.00% |  |  |
Tranche One | Key Employees | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  |  | 54,525,000 | 80,050,000 |  |
Fair Value at Grant Date |  |  |  |  |  |  |  |  | $ 11,654 | $ 13,417 |  |
Tranche One | Officers | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  |  |  |  | 8,444,000 |
Fair Value at Grant Date |  |  |  |  |  |  |  |  |  |  | $ 1,368 |
Tranche Two | Officers | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  |  | 88,224,000 | 94,756,000 | 1,763,000 |
Fair Value at Grant Date |  |  |  |  |  |  |  |  | $ 19,629 | $ 17,856 | $ 354 |
Tranche Two | Officers | Stock Incentive Plan | Restricted Stock Units, Market-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Compensation not yet recognized |  |  |  |  |  |  |  |  | $ 354 | $ 177 |  |
Tranche Three | Key Employees and Officers | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  |  | 1,201,000 | 29,890,000 |  |
Fair Value at Grant Date |  |  |  |  |  |  |  |  | $ 227 | $ 5,153 |  |

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