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Capital Stock and Changes in Capital Accounts (Details)
 12 Months Ended
Apr. 30, 2023
Vote
shares
Class A  
Class of Stock [Line Items]  
Class A common shares into which each share of class B common stock is convertible (in shares) | shares 1
Percentage of the board of directors elected by class A common stockholders 30.00%
Number of votes to which each share of common stock is entitled 0.1
Class B  
Class of Stock [Line Items]  
Number of votes to which each share of common stock is entitled 1