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Stock-Based Compensation Non-Vested Stock Options (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Options |  |  |
Options granted (in shares) | 0 | 0 | 0
Weighted Average Grant Date Fair value |  |  |
Unrecognized compensation cost related to non-vested stock awards | $ 11,737,000 |  |
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 4 months 24 days |  |
Exercise of stock options | $ 1,522,000 | $ 100,000 | $ 71,000
Excess tax benefit from stock-based compensation | $ 0 | $ 0 | 0
Stock options |  |  |
Options |  |  |
Non-vested at beginning of year (in shares) | 16,000 |  |
Vested (in shares) | (16,000) |  |
Non-vested at end of year (in shares) |  | 16,000 |
Weighted Average Grant Date Fair value |  |  |
Non-vested at beginning of year (in dollars per share) | $ 10.16 |  |
Vested (in dollars per share) | $ 10.16 |  |
Non-vested at end of year (in dollars per share) |  | $ 10.16 |
Exercise of stock options | $ 1,522,000 | $ 101,000 | 67,000
Fair value of shares vested | $ 5,312,000 | $ 4,900,000 | $ 4,756,000

X
- 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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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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