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Preferred and Common Stock- Schedule of Restricted Stock and Restricted Stock Units Granted (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 23, 2019 | Sep. 04, 2019 | Jun. 24, 2019 | Jun. 04, 2019 | Sep. 05, 2018 | Jun. 08, 2018 | May 24, 2018 | Mar. 29, 2018 | Sep. 28, 2017 | Jul. 14, 2017 | Jun. 01, 2017 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  |  |  |  |  | 189,035 | 172,232 | 126,980
Key Employees | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  | 75,959,000 |  |  | 88,846,000 |  |  |  | 63,699,000 |  |  |
Fair Value at Grant Date |  |  |  | $ 9,886 |  |  | $ 8,593 |  |  |  | $ 7,388 |  |  |
Officers | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  | 59,579,000 |  | 75,402,000 |  |  |  | 61,126,000 |  |  |  |
Fair Value at Grant Date |  |  |  | $ 9,097 |  | $ 7,571 |  |  |  | $ 6,912 |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Compensation not yet recognized |  |  |  | $ 3,100 |  | $ 2,600 |  |  |  | $ 2,300 |  |  |  |
Non-Employee Board Members | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  | 5,504,000 |  |  | 7,984,000 |  |  | 2,150,000 |  |  |  |  |  |
Fair Value at Grant Date |  | $ 919 |  |  | $ 920 |  |  | $ 236 |  |  |  |  |  |
Non-Employee Board Members | Stock Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  |  | 8,344,000 |  |  |  |  |
Fair Value at Grant Date |  |  |  |  |  |  |  |  | $ 920 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Compensation not yet recognized |  |  | $ 1,800 |  |  |  |  |  |  |  |  |  |  |
Minimum | Officers | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |
Minimum | CEO | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |
Maximum | Officers | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |
Maximum | CEO | Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  | 200.00% |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 1,763,000 |  |
Fair Value at Grant Date |  |  |  |  |  |  |  |  |  |  |  | $ 354 |  |
Compensation not yet recognized |  |  |  |  |  |  |  |  |  |  |  | $ 177 |  |

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