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Stock-Based Compensation, Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
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