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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
Number of Options (in 000’s) |  |  |
Exercised (in shares) | 0 |  |
Aggregate Intrinsic Value (in millions) |  |  |
Options Outstanding, Number of Options (in shares) | 375,000 |  |
Options Outstanding, Weighted Average Remaining Term (in years) | 7 years 10 months 24 days |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 48.74 |  |
Options Exercisable, Number of Options (in shares) | 132,000 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 58.79 |  |
$32.68 to $45.99 |  |  |
Aggregate Intrinsic Value (in millions) |  |  |
Weighted average grant date, fair value (in dollars per share) | 32.68 |  |
Exercise price range, upper range limit (in dollars per share) | $ 45.99 |  |
Options Outstanding, Number of Options (in shares) | 190,000 |  |
Options Outstanding, Weighted Average Remaining Term (in years) | 9 years 4 months 24 days |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 35.54 |  |
Options Exercisable, Number of Options (in shares) | 18,000 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 35.70 |  |
$53.79 to $63.07 |  |  |
Aggregate Intrinsic Value (in millions) |  |  |
Weighted average grant date, fair value (in dollars per share) | 53.79 |  |
Exercise price range, upper range limit (in dollars per share) | $ 63.07 |  |
Options Outstanding, Number of Options (in shares) | 185,000 |  |
Options Outstanding, Weighted Average Remaining Term (in years) | 6 years 3 months 18 days |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 62.34 |  |
Options Exercisable, Number of Options (in shares) | 114,000 |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 62.45 |  |
Options |  |  |
Estimated weighted average fair value for options granted and significant weighted average assumptions used [Abstract] |  |  |
Weighted average fair value of options on grant date (in dollars per share) | $ 6.47 | $ 9.24 | $ 11.75
Weighted Average Assumptions [Abstract] |  |  |
Expected life of options (years) | 6 years 3 months 18 days | 5 years 10 months 24 days | 6 years 3 months 18 days
Risk-free interest rate | 4.60% | 2.00% | 1.20%
Expected volatility | 34.00% | 32.40% | 30.70%
Expected dividend yield | 4.60% | 3.40% | 2.40%
Fair value of common stock on grant date (in dollars per share) | $ 30.37 | $ 41.30 | $ 56.51
Exercise price of stock option grant (in dollars per share) | $ 34.86 | $ 41.30 | $ 61.84
Options, Additional Disclosure [Abstract] |  |  |
Award vesting amount | $ 1.5 |  |
Award vesting period | 4 years |  |
Weighted average recognition period for unrecognized share-based compensation | 2 years 3 months 18 days |  |
Options, exercises in period, intrinsic value |  | $ 0.1 | $ 0.4
Total grant date fair value of stock options vested | $ 0.9 | $ 0.5 | $ 1.3
Number of Options (in 000’s) |  |  |
Outstanding at beginning of year (in shares) | 312,000 |  |
Granted (in shares) | 170,000 |  |
Exercised (in shares) | 0 |  |
Expired or forfeited (in shares) | (107,000) |  |
Outstanding at end of year (in shares) | 375,000 | 312,000 |
Exercisable (in shares) | 132,000 |  |
Vested and expected to vest in the future (in shares) | 369,000 |  |
Weighted Average Exercise Price |  |  |
Outstanding at beginning of year (in dollars per share) | $ 59.77 |  |
Granted (in dollars per share) | 34.86 |  |
Exercised (in dollars per share) | 0 |  |
Expired or forfeited (in dollars per share) | 58.80 |  |
Outstanding at end of year (in dollars per share) | 48.74 | $ 59.77 |
Exercisable (in dollars per share) | 58.79 |  |
Vested and expected to vest in the future (in dollars per share) | $ 48.89 |  |
Weighted Average Remaining Term (in years) |  |  |
Outstanding at end of year | 7 years 10 months 24 days |  |
Exercisable at end of year | 6 years 7 months 6 days |  |
Vested and expected to vest in the future at end of year | 7 years 10 months 24 days |  |
Aggregate Intrinsic Value (in millions) |  |  |
Outstanding at end of year | $ 0.5 |  |
Exercisable at end of year | 0.0 |  |
Vested and expected to vest in the future | $ 0.5 |  |
Options | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price of stock options granted as percentage of fair market value of stock at date of grant as required by the plan | 100.00% |  |
Options | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercisable period | 10 years |  |
Options | Share-based Payment Arrangement, Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 10.00% |  |
Options | Share-based Payment Arrangement, Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 20.00% |  |
Options | Share-Based Payment Arrangement, Tranche Three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 30.00% |  |
Options | Share-based Compensation Award, Tranche Four |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 40.00% |  |

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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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- Definition Number of options outstanding, including both vested and non-vested options. + 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)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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