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Stock-Based Compensation Non-Vested Stock Options (Details) - USD ($)
 12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Options      
Options granted (in shares) 0 0 0
Weighted Average Grant Date Fair value      
Unrecognized compensation cost related to non-vested stock awards $ 11,737,000    
Period over which unrecognized compensation cost is expected to be recognized 2 years    
Weighted average period over which unrecognized compensation cost is expected to be recognized 2 years 4 months 24 days    
Exercise of stock options $ 1,522,000 $ 100,000 $ 71,000
Excess tax benefit from stock-based compensation $ 0 $ 0 0
Stock options      
Options      
Non-vested at beginning of year (in shares) 16,000    
Vested (in shares) (16,000)    
Non-vested at end of year (in shares)   16,000  
Weighted Average Grant Date Fair value      
Non-vested at beginning of year (in dollars per share) $ 10.16    
Vested (in dollars per share) $ 10.16    
Non-vested at end of year (in dollars per share)   $ 10.16  
Exercise of stock options $ 1,522,000 $ 101,000 67,000
Fair value of shares vested $ 5,312,000 $ 4,900,000 $ 4,756,000