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Stock-Based Compensation Stock Option Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Shares      
Options granted (in shares) 0 0 0
Stock options      
Intrinsic value of options      
Intrinsic value of options exercised $ 7,369 $ 4,785 $ 4,828
Intrinsic value of options outstanding $ 4,822 $ 9,229  
Restated 2006 Plan | Stock options      
Shares      
Outstanding at the beginning of the year (in shares) 166,164 280,526 334,026
Options exercised (in shares) (100,000) (114,362) (53,500)
Outstanding at the end of the year (in shares) 66,164 166,164 280,526
Options exercisable (in shares) 66,164    
Weighted Average Exercise Price      
Outstanding at the beginning of the year (in dollars per share) $ 24.78 $ 24.57 $ 25.19
Options exercised (in dollars per share) 22.77 24.28 28.45
Outstanding at the end of the year (in dollars per share) 27.82 $ 24.78 $ 24.57
Options exercisable (in dollars per share) $ 27.82    
1992 Plan | Stock options      
Shares      
Outstanding at the beginning of the year (in shares)     1,113
Options exercised (in shares)     (1,113)
Weighted Average Exercise Price      
Outstanding at the beginning of the year (in dollars per share)     $ 0.59
Options exercised (in dollars per share)     $ 0.59