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Stock-Based Compensation Non-Vested Stock Options (Details) - USD ($) | 12 Months Ended | 36 Months Ended
--- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2020
Options |  |  |  |
Options granted (in shares) | 0 | 0 | 0 |
Weighted Average Grant Date Fair value |  |  |  |
Unrecognized compensation cost related to non-vested stock awards | $ 7,670,000 |  |  | $ 7,670,000
Period over which unrecognized compensation cost is expected to be recognized | 2 years |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years 6 months |  |  |
Exercise of stock options | $ 100,000 | $ 71,000 | $ 2,705,000 |
Excess tax benefit from stock-based compensation |  |  |  | $ 0
Stock options |  |  |  |
Options |  |  |  |
Non-vested at beginning of year (in shares) | 39,510 |  |  |
Vested (in shares) | (23,510) |  |  |
Non-vested at end of year (in shares) | 16,000 | 39,510 |  | 16,000
Weighted Average Grant Date Fair value |  |  |  |
Non-vested at beginning of year (in dollars per share) | $ 10.90 |  |  |
Vested (in dollars per share) | 11.40 |  |  |
Non-vested at end of year (in dollars per share) | $ 10.16 | $ 10.90 |  | $ 10.16
Exercise of stock options | $ 101,000 | $ 67,000 | 2,576,000 |
Fair value of shares vested | $ 4,900,000 | $ 4,756,000 | $ 3,328,000 |

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- Definition Represents the period over which unrecognized compensation cost is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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