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Stock-Based Compensation Stock Option Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
Shares |  |  |
Options granted (in shares) |  |  | 0
Stock options |  |  |
Intrinsic value of options |  |  |
Intrinsic value of options exercised | $ 0 | $ 7,369 | $ 4,785
Intrinsic value of options outstanding | $ 8,732 | $ 4,822 |
Restated 2006 Plan | Stock options |  |  |
Shares |  |  |
Outstanding at the beginning of the year (in shares) | 66,164 | 166,164 | 280,526
Options exercised (in shares) |  | (100,000) | (114,362)
Outstanding at the end of the year (in shares) | 66,164 | 66,164 | 166,164
Options exercisable (in shares) | 66,164 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the year (in dollars per share) | $ 27.82 | $ 24.78 | $ 24.57
Options exercised (in dollars per share) |  | 22.77 | 24.28
Outstanding at the end of the year (in dollars per share) | 27.82 | $ 27.82 | $ 24.78
Options exercisable (in dollars per share) | $ 27.82 |  |

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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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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