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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, 2020 | Apr. 30, 2019 | Apr. 30, 2018 | 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) | 286,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 2 years |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 50.14 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 286,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 50.14 |  |  |  |  |
$39.53 to $40.02 [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 |  |  |  |  |
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 40.02 |  |  |  |  |
Options Outstanding, Number of Options (in shares) | 78,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 1 year 6 months |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 39.69 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 78,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 39.69 |  |  |  |  |
$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) | 88,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 1 year 2 months 12 days |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 48.75 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 88,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 48.75 |  |  |  |  |
$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) | 120,000 |  |  |  |  |
Options Outstanding, Weighted Average Remaining Term | 2 years 10 months 24 days |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 57.89 |  |  |  |  |
Options Exercisable, Number of Options (in shares) | 120,000 |  |  |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 57.89 |  |  |  |  |
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) | 372,000 | 611,000 | 1,429,000 |  |  |
Granted (in shares) | 0 | 0 | 0 | 0 |  |
Exercised (in shares) | (34,000) | (229,000) | (788,000) |  |  |
Expired or Forfeited (in shares) | (52,000) | (10,000) | (30,000) |  |  |
Outstanding at End of Year (in shares) | 286,000 | 372,000 | 611,000 | 1,429,000 |  |
Exercisable at End of Year (in shares) | 286,000 | 372,000 | 530,000 |  |  |
Vested and Expected to Vest in the Future at End of Year (in shares) | 286,000 | 372,000 | 599,000 |  |  |
Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Outstanding at Beginning of Year (in dollars per share) | $ 49.70 | $ 48.88 | $ 47.39 |  |  |
Granted (in dollars per share) | 0 | 0 | 0 |  |  |
Exercised (in dollars per share) | 38.32 | 47.21 | 45.97 |  |  |
Expired or Forfeited (in dollars per share) | 54.57 | 56.97 | 54.24 |  |  |
Outstanding at End of Year (in dollars per share) | 50.14 | 49.70 | 48.88 | $ 47.39 |  |
Exercisable at End of Year (in dollars per share) | 50.14 | 49.70 | 47.43 |  |  |
Vested and Expected to Vest in the Future at End of Year (in dollars per share) | $ 50.14 | $ 49.70 | $ 48.90 |  |  |
Weighted Average Remaining Term [Abstract] |  |  |  |  |  |
Outstanding at End of Year | 2 years |  |  |  |  |
Exercisable at End of Year | 2 years |  |  |  |  |
Vested and Expected to Vest in the Future at End of Year | 2 years |  |  |  |  |
Average Intrinsic Value [Abstract] |  |  |  |  |  |
Outstanding at End of Year | $ 0.0 |  |  |  |  |
Exercisable at End of Year | 0.0 |  |  |  |  |
Vested and Expected to Vest in the Future at End of Year | 0.0 |  |  |  |  |
Options, Additional Disclosure [Abstract] |  |  |  |  |  |
Total intrinsic value of options exercised | 0.3 | $ 4.4 | $ 10.4 |  |  |
Total grant date fair value of stock options vested |  | $ 4.8 |  |  |  |
Unrecognized share-based compensation expense | $ 0.0 |  |  |  |  |
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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