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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2016
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) |  |  |  | $ 14.77
Options, Additional Disclosure [Abstract] |  |  |  |
Options Outstanding, Number of Options (in shares) | 312,000 |  |  |
Options Outstanding, Weighted Average Remaining Term (in years) | 7 years 7 months 6 days |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 59.77 |  |  |
Options Exercisable, Number of Options (in shares) | 103,000 |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 60.49 |  |  |
$36.60 to $39.53 |  |  |  |
Options, Additional Disclosure [Abstract] |  |  |  |
Weighted average grant date, fair value (in dollars per share) | 36.60 |  |  |
Exercise price range, upper range limit (in dollars per share) | $ 39.53 |  |  |
Options Outstanding, Number of Options (in shares) | 13,000 |  |  |
Options Outstanding, Weighted Average Remaining Term (in years) | 7 years 8 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 37.26 |  |  |
Options Exercisable, Number of Options (in shares) | 3,000 |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 39.53 |  |  |
$45.99 to $53.79 |  |  |  |
Options, Additional Disclosure [Abstract] |  |  |  |
Weighted average grant date, fair value (in dollars per share) | 45.99 |  |  |
Exercise price range, upper range limit (in dollars per share) | $ 53.79 |  |  |
Options Outstanding, Number of Options (in shares) | 40,000 |  |  |
Options Outstanding, Weighted Average Remaining Term (in years) | 8 years 8 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 51.43 |  |  |
Options Exercisable, Number of Options (in shares) | 3,000 |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 53.24 |  |  |
$55.62 to $63.07 |  |  |  |
Options, Additional Disclosure [Abstract] |  |  |  |
Weighted average grant date, fair value (in dollars per share) | 55.62 |  |  |
Exercise price range, upper range limit (in dollars per share) | $ 63.07 |  |  |
Options Outstanding, Number of Options (in shares) | 259,000 |  |  |
Options Outstanding, Weighted Average Remaining Term (in years) | 7 years 6 months |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 62.17 |  |  |
Options Exercisable, Number of Options (in shares) | 97,000 |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 61.34 |  |  |
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted (in shares) | 20,000 | 300,000 |  |
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) | $ 9.24 | $ 11.75 |  |
Weighted Average Assumptions [Abstract] |  |  |  |
Expected life of options (years) | 5 years 10 months 24 days | 6 years 3 months 18 days |  |
Risk-free interest rate | 2.00% | 1.20% |  |
Expected volatility | 32.40% | 30.70% |  |
Expected dividend yield | 3.40% | 2.40% |  |
Fair value of common stock on grant date (in dollars per share) | $ 41.30 | $ 56.51 |  |
Exercise price of stock option grant (in dollars per share) | $ 41.30 | $ 61.84 |  |
Number of Options (in 000’s) |  |  |  |
Outstanding at beginning of year (in shares) | 310,000 |  |  |
Granted (in shares) | 20,000 | 300,000 |  |
Exercised (in shares) | (14,000) |  |  |
Expired or forfeited (in shares) | (4,000) |  |  |
Outstanding at end of year (in shares) | 312,000 | 310,000 |  |
Exercisable (in shares) | 103,000 |  |  |
Vested and expected to vest in the future (in shares) | 302,000 |  |  |
Weighted Average Exercise Price |  |  |  |
Outstanding at beginning of year (in dollars per share) | $ 59.89 |  |  |
Granted (in dollars per share) | 41.30 |  |  |
Exercised (in dollars per share) | 39.53 |  |  |
Expired or forfeited (in dollars per share) | 48.06 |  |  |
Outstanding at end of year (in dollars per share) | 59.77 | $ 59.89 |  |
Exercisable (in dollars per share) | 60.49 |  |  |
Vested and expected to vest in the future (in dollars per share) | $ 60.18 |  |  |
Weighted Average Remaining Term (in years) |  |  |  |
Outstanding at end of year | 7 years 7 months 6 days |  |  |
Exercisable at end of year | 6 years 1 month 6 days |  |  |
Vested and expected to vest in the future at end of year | 7 years 7 months 6 days |  |  |
Aggregate Intrinsic Value (in millions) |  |  |  |
Outstanding at end of year | $ 0.0 |  |  |
Exercisable at end of year | 0.0 |  |  |
Vested and expected to vest in the future | 0.0 |  |  |
Options, Additional Disclosure [Abstract] |  |  |  |
Award vesting amount | $ 1.7 |  |  |
Award vesting period | 4 years |  |  |
Weighted average recognition period for unrecognized share-based compensation | 2 years 2 months 12 days |  |  |
Options, exercises in period, intrinsic value | $ 0.1 | $ 0.4 | $ 0.2 |
Total grant date fair value of stock options vested | $ 0.5 | $ 1.3 |  |
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% |  |  |
Executive Leadership Team |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted (in shares) | 260,000 |  |  |
Grant price (in dollars per share) | $ 63.07 |  |  |
Number of Options (in 000’s) |  |  |  |
Granted (in shares) | 260,000 |  |  |
Other Leaders |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted (in shares) | 40,000 |  |  |
Number of Options (in 000’s) |  |  |  |
Granted (in shares) | 40,000 |  |  |

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