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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, 2021 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Options Outstanding, Number of Options (in shares) | 141,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 2 years 7 months 6 days |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 51.17 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 141,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 51.17 |  |  |  |  |
Range of Exercise Prices - $39.53 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | $ 39.53 |  |  |  |  |
Options Outstanding, Number of Options (in shares) | 34,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 2 years |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 39.53 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 34,000 |  |  |  |  |
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 Range [Line Items] |  |  |  |  |  |
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) | 32,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 1 year 1 month 6 days |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 48.22 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 32,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 48.22 |  |  |  |  |
Range of Exercise Prices - $55.99 to $59.70 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | 55.99 |  |  |  |  |
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 59.70 |  |  |  |  |
Options Outstanding, Number of Options (in shares) | 75,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 3 years 7 months 6 days |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 57.76 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 75,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 57.76 |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |
Estimated weighted average fair value for options granted and significant weighted average assumptions used [Abstract] |  |  |  |  |  |
Fair Value of Options on Grant Date (in dollars per share) |  |  |  |  | $ 14.77 |
Options [Roll Forward] |  |  |  |  |  |
Outstanding at beginning of year (in shares) | 286,000 | 372,000 | 611,000 |  |  |
Granted (in shares) | 0 | 0 | 0 | 0 |  |
Exercised (in shares) | (60,000) | (34,000) | (229,000) |  |  |
Expired or forfeited (in shares) | (85,000) | (52,000) | (10,000) |  |  |
Outstanding at end of year (in shares) | 141,000 | 286,000 | 372,000 |  |  |
Exercisable at end of year (in shares) | 141,000 | 286,000 | 372,000 |  |  |
Vested and expected to vest in the future at end of year (in shares) | 141,000 | 286,000 | 372,000 |  |  |
Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Outstanding at beginning of year (in dollars per share) | $ 50.14 | $ 49.70 | $ 48.88 |  |  |
Granted (in dollars per share) | 0 | 0 | 0 |  |  |
Exercised (in dollars per share) | 43.91 | 38.32 | 47.21 |  |  |
Expired or forfeited (in dollars per share) | 52.78 | 54.57 | 56.97 |  |  |
Outstanding at end of year (in dollars per share) | 51.17 | 50.14 | 49.70 |  |  |
Exercisable at end of year (in dollars per share) | 51.17 | 50.14 | 49.70 |  |  |
Vested and expected to vest in the future at end of year (in dollars per share) | $ 51.17 | $ 50.14 | $ 49.70 |  |  |
Weighted Average Remaining Term [Abstract] |  |  |  |  |  |
Outstanding at end of year | 2 years 7 months 6 days |  |  |  |  |
Exercisable at end of year | 2 years 7 months 6 days |  |  |  |  |
Vested and expected to vest in the future at end of year | 2 years 7 months 6 days |  |  |  |  |
Average Intrinsic Value [Abstract] |  |  |  |  |  |
Outstanding at end of year | $ 0.9 |  |  |  |  |
Exercisable at end of year | 0.9 |  |  |  |  |
Vested and expected to vest in the future at end of year | 0.9 |  |  |  |  |
Options, Additional Disclosure [Abstract] |  |  |  |  |  |
Unrecognized share-based compensation expense |  |  | $ 0.0 |  |  |
Total intrinsic value of options exercised | $ 0.2 | $ 0.3 | 4.4 |  |  |
Total grant date fair value of stock options vested |  |  | $ 4.8 |  |  |
Stock Options [Member] | Minimum [Member] |  |  |  |  |  |
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% |  |  |  |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Exercisable period | 10 years |  |  |  |  |
Stock Options [Member] | Vesting on Fourth Anniversary Date Following Date of Grant [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 50.00%
Stock Options [Member] | Vesting on Fifth Anniversary Date Following Date of Grant [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 50.00%
Stock Options [Member] | Annual Vesting on April 30th [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 25.00% |

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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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