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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. 05, 2018 | Jun. 08, 2018 | May 24, 2018 | Mar. 29, 2018 | Sep. 28, 2017 | Jul. 14, 2017 | Jun. 01, 2017 | Sep. 16, 2016 | Jun. 03, 2016 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  |  |  | 172,232 | 126,980 | 111,150
Officers & Key employees | 2009 Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  |  | 111,150 |  |  |
Fair Value at Grant Date |  |  |  |  |  |  |  |  | $ 13,849 |  |  |
Officers & Key employees | 2009 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  |  |  | 40,996 |  |  |
Fair Value at Grant Date |  |  |  |  |  |  |  |  | $ 5,108 |  |  |
Non-employee board members | 2009 Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted | 7,984,000 |  |  |  |  |  |  |  |  |  |  |
Fair Value at Grant Date | $ 920 |  |  |  |  |  |  |  |  |  |  |
Non-employee board members | 2009 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  | 2,150,000 | 8,344,000 |  |  | 8,941 |  |  |  |
Fair Value at Grant Date |  |  |  | $ 236 | $ 920 |  |  | $ 1,064 |  |  |  |
Key Employees | 2009 Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  |  | 88,846,000 |  |  |  | 63,699,000 |  |  |  |  |
Fair Value at Grant Date |  |  | $ 8,593 |  |  |  | $ 7,388 |  |  |  |  |
Officers | 2009 Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted |  | 75,402,000 |  |  |  | 61,126,000 |  |  |  |  |  |
Fair Value at Grant Date |  | $ 7,571 |  |  |  | $ 6,912 |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 3 years |  |  |  |  |  |
Compensation not yet recognized |  | $ 2,800 |  |  |  | $ 2,600 |  |  |  |  |  |
Minimum | Officers | 2009 Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  | 0.00% |  |  |  |  |  |
Maximum | Officers | 2009 Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Target allocation percentage |  |  |  |  |  | 200.00% |  |  |  |  |  |

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