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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, 2022 | Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2016 | Apr. 30, 2015
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price [Abstract] |  |  |  |  |  |
Options Outstanding, Number of Options (in shares) | 310,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 8 years 1 month 6 days |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 59.89 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 72,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 54.53 |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |
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) | $ 11.75 |  |  |  | $ 14.77 |
Weighted Average Assumptions [Abstract] |  |  |  |  |  |
Expected life of options (years) | 6 years 3 months 18 days |  |  |  |  |
Risk-free interest rate | 1.20% |  |  |  |  |
Expected volatility | 30.70% |  |  |  |  |
Expected dividend yield | 2.40% |  |  |  |  |
Fair value of common stock on grant date (in dollars per share) | $ 56.51 |  |  |  |  |
Exercise price of stock option grant (in dollars per share) | $ 61.84 |  |  |  |  |
Options [Roll Forward] |  |  |  |  |  |
Outstanding at beginning of year (in shares) | 141,000 | 286,000 | 372,000 |  |  |
Granted (in shares) | 300,000 | 0 | 0 |  |  |
Exercised (in shares) | (49,000) | (60,000) | (34,000) |  |  |
Expired or forfeited (in shares) | (82,000) | (85,000) | (52,000) |  |  |
Outstanding at end of year (in shares) | 310,000 | 141,000 | 286,000 | 372,000 |  |
Exercisable at end of year (in shares) | 72,000 | 141,000 | 286,000 |  |  |
Vested and expected to vest in the future at end of year (in shares) | 306,000 | 141,000 | 286,000 |  |  |
Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Outstanding at beginning of year (in dollars per share) | $ 51.17 | $ 50.14 | $ 49.70 |  |  |
Granted (in dollars per share) | 61.84 | 0 | 0 |  |  |
Exercised (in dollars per share) | 45.85 | 43.91 | 38.32 |  |  |
Expired or forfeited (in dollars per share) | 60.36 | 52.78 | 54.57 |  |  |
Outstanding at end of year (in dollars per share) | 59.89 | 51.17 | 50.14 | $ 49.70 |  |
Exercisable at end of year (in dollars per share) | 54.53 | 51.17 | 50.14 |  |  |
Vested and expected to vest in the future at end of year (in dollars per share) | $ 60.55 | $ 51.17 | $ 50.14 |  |  |
Weighted Average Remaining Term [Abstract] |  |  |  |  |  |
Outstanding at end of year | 8 years 1 month 6 days |  |  |  |  |
Exercisable at end of year | 4 years 2 months 12 days |  |  |  |  |
Vested and expected to vest in the future at end of year | 9 years 1 month 6 days |  |  |  |  |
Average Intrinsic Value [Abstract] |  |  |  |  |  |
Outstanding at end of year | $ 0.2 |  |  |  |  |
Exercisable at end of year | 7.6 |  |  |  |  |
Vested and expected to vest in the future at end of year | 0.0 |  |  |  |  |
Options, Additional Disclosure [Abstract] |  |  |  |  |  |
Unrecognized share-based compensation expense | $ 2.3 |  |  | $ 0.0 |  |
Award vesting period | 4 years |  |  |  |  |
Weighted average recognition period for unrecognized share-based compensation | 3 years 1 month 6 days |  |  |  |  |
Total intrinsic value of options exercised | $ 0.4 | $ 0.2 | $ 0.3 |  |  |
Total grant date fair value of stock options vested | $ 1.3 |  |  |  |  |
Stock Options [Member] | Minimum [Member] |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |
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% |  |  |  |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |
Exercisable period | 10 years |  |  |  |  |
Stock Options [Member] | Vesting on April 30, 2023 or Anniversary Date [Member] |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |
Award vesting percentage | 10.00% |  |  |  |  |
Stock Options [Member] | Vesting on April 30, 2024 or Anniversary Date [Member] |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |
Award vesting percentage | 20.00% |  |  |  |  |
Stock Options [Member] | Vesting on April 30, 2025 or Anniversary Date [Member] |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |
Award vesting percentage | 30.00% |  |  |  |  |
Stock Options [Member] | Vesting on April 30, 2026 or Anniversary Date [Member] |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |
Award vesting percentage | 40.00% |  |  |  |  |
Stock Options [Member] | Vesting on Fourth Anniversary Date Following Date of Grant [Member] |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 50.00%
Stock Options [Member] | Vesting on Fifth Anniversary Date Following Date of Grant [Member] |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 50.00%
Stock Options [Member] | Annual Vesting on April 30 [Member] |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 25.00% |
Executive Leadership Team [Member] |  |  |  |  |  |
Weighted Average Assumptions [Abstract] |  |  |  |  |  |
Grant price (in dollars per share) | $ 63.07 |  |  |  |  |
Options [Roll Forward] |  |  |  |  |  |
Granted (in shares) | 260,000 |  |  |  |  |
Other Leaders [Member] |  |  |  |  |  |
Options [Roll Forward] |  |  |  |  |  |
Granted (in shares) | 40,000 |  |  |  |  |
Range of Exercise Prices - $39.53 [Member] |  |  |  |  |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price [Abstract] |  |  |  |  |  |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | $ 39.53 |  |  |  |  |
Options Outstanding, Number of Options (in shares) | 17,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 1 year 2 months 12 days |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 39.53 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 17,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 39.53 |  |  |  |  |
Range of Exercise Prices - $48.06 to $49.55 [Member] |  |  |  |  |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price [Abstract] |  |  |  |  |  |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | 48.06 |  |  |  |  |
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 49.55 |  |  |  |  |
Options Outstanding, Number of Options (in shares) | 33,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 2 months 12 days |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 52.69 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 3,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 48.06 |  |  |  |  |
Range of Exercise Prices - $55.62 to $63.07 [Member] |  |  |  |  |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price [Abstract] |  |  |  |  |  |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | 55.62 |  |  |  |  |
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 63.07 |  |  |  |  |
Options Outstanding, Number of Options (in shares) | 260,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 5 years 4 months 24 days |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 62.17 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 52,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 59.98 |  |  |  |  |

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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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