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Stock-Based Compensation Stock Option Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020
Shares |  |  |
Options granted (in shares) | 0 | 0 | 0
Stock options |  |  |
Intrinsic value of options |  |  |
Intrinsic value of options exercised | $ 4,785 | $ 4,828 | $ 833
Intrinsic value of options outstanding | 9,229 | 24,068 |
Intrinsic value of exercisable options | $ 9,229 | $ 24,068 |
Restated 2006 Plan | Stock options |  |  |
Shares |  |  |
Outstanding at the beginning of the year (in shares) | 280,526 | 334,026 | 337,026
Options exercised (in shares) | (114,362) | (53,500) | (3,000)
Outstanding at the end of the year (in shares) | 166,164 | 280,526 | 334,026
Options exercisable (in shares) | 166,164 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the year (in dollars per share) | $ 24.57 | $ 25.19 | $ 25.25
Options exercised (in dollars per share) | 24.28 | 28.45 | 31.15
Outstanding at the end of the year (in dollars per share) | 24.78 | $ 24.57 | $ 25.19
Options exercisable (in dollars per share) | $ 24.78 |  |
1992 Plan | Stock options |  |  |
Shares |  |  |
Outstanding at the beginning of the year (in shares) |  | 1,113 | 14,302
Options exercised (in shares) |  | (1,113) | (13,189)
Outstanding at the end of the year (in shares) |  |  | 1,113
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the year (in dollars per share) |  | $ 0.59 | $ 0.59
Options exercised (in dollars per share) |  | $ 0.59 | 0.59
Outstanding at the end of the year (in dollars per share) |  |  | $ 0.59

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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