XML 157 R90.htm IDEA: XBRL DOCUMENT v3.24.1.1.u2
Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Number of Options (in 000’s)      
Exercised (in shares) 0    
Aggregate Intrinsic Value (in millions)      
Options Outstanding, Number of Options (in shares) 375,000    
Options Outstanding, Weighted Average Remaining Term (in years) 7 years 10 months 24 days    
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 48.74    
Options Exercisable, Number of Options (in shares) 132,000    
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 58.79    
$32.68 to $45.99      
Aggregate Intrinsic Value (in millions)      
Weighted average grant date, fair value (in dollars per share) 32.68    
Exercise price range, upper range limit (in dollars per share) $ 45.99    
Options Outstanding, Number of Options (in shares) 190,000    
Options Outstanding, Weighted Average Remaining Term (in years) 9 years 4 months 24 days    
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 35.54    
Options Exercisable, Number of Options (in shares) 18,000    
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 35.70    
$53.79 to $63.07      
Aggregate Intrinsic Value (in millions)      
Weighted average grant date, fair value (in dollars per share) 53.79    
Exercise price range, upper range limit (in dollars per share) $ 63.07    
Options Outstanding, Number of Options (in shares) 185,000    
Options Outstanding, Weighted Average Remaining Term (in years) 6 years 3 months 18 days    
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 62.34    
Options Exercisable, Number of Options (in shares) 114,000    
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 62.45    
Options      
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) $ 6.47 $ 9.24 $ 11.75
Weighted Average Assumptions [Abstract]      
Expected life of options (years) 6 years 3 months 18 days 5 years 10 months 24 days 6 years 3 months 18 days
Risk-free interest rate 4.60% 2.00% 1.20%
Expected volatility 34.00% 32.40% 30.70%
Expected dividend yield 4.60% 3.40% 2.40%
Fair value of common stock on grant date (in dollars per share) $ 30.37 $ 41.30 $ 56.51
Exercise price of stock option grant (in dollars per share) $ 34.86 $ 41.30 $ 61.84
Options, Additional Disclosure [Abstract]      
Award vesting amount $ 1.5    
Award vesting period 4 years    
Weighted average recognition period for unrecognized share-based compensation 2 years 3 months 18 days    
Options, exercises in period, intrinsic value   $ 0.1 $ 0.4
Total grant date fair value of stock options vested $ 0.9 $ 0.5 $ 1.3
Number of Options (in 000’s)      
Outstanding at beginning of year (in shares) 312,000    
Granted (in shares) 170,000    
Exercised (in shares) 0    
Expired or forfeited (in shares) (107,000)    
Outstanding at end of year (in shares) 375,000 312,000  
Exercisable (in shares) 132,000    
Vested and expected to vest in the future (in shares) 369,000    
Weighted Average Exercise Price      
Outstanding at beginning of year (in dollars per share) $ 59.77    
Granted (in dollars per share) 34.86    
Exercised (in dollars per share) 0    
Expired or forfeited (in dollars per share) 58.80    
Outstanding at end of year (in dollars per share) 48.74 $ 59.77  
Exercisable (in dollars per share) 58.79    
Vested and expected to vest in the future (in dollars per share) $ 48.89    
Weighted Average Remaining Term (in years)      
Outstanding at end of year 7 years 10 months 24 days    
Exercisable at end of year 6 years 7 months 6 days    
Vested and expected to vest in the future at end of year 7 years 10 months 24 days    
Aggregate Intrinsic Value (in millions)      
Outstanding at end of year $ 0.5    
Exercisable at end of year 0.0    
Vested and expected to vest in the future $ 0.5    
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%