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Stock-Based Compensation - SARs (Details) - SARs
12 Months Ended
Apr. 30, 2022
USD ($)
$ / shares
shares
Stock-Based Compensation  
Term of award 10 years
Unrecognized compensation cost | $ $ 0
Fiscal 2014 Grant  
Stock-Based Compensation  
SARs outstanding (in shares) | shares 6,010
Intrinsic value per share (in dollars per share) | $ / shares $ 7.22