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Capital Stock and Changes in Capital Accounts - Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 11, 2023
Oct. 26, 2022
Jul. 20, 2022
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2023
Jan. 31, 2022
Dividends Payable [Line Items]              
Total dividend           $ 58,067 $ 57,900
Class A common stock              
Dividends Payable [Line Items]              
Quarterly cash dividend (in dollars per share)       $ 0.3475 $ 0.3450 $ 0.3475 $ 0.3450
Class B common stock              
Dividends Payable [Line Items]              
Quarterly cash dividend (in dollars per share)       $ 0.3475 $ 0.3450 $ 0.3475 $ 0.3450
Dividend Declared in Q1 2021 | Class A common stock              
Dividends Payable [Line Items]              
Quarterly cash dividend (in dollars per share)     $ 0.3475        
Total dividend     $ 19,400        
Dividend Declared in Q1 2021 | Class B common stock              
Dividends Payable [Line Items]              
Quarterly cash dividend (in dollars per share)     $ 0.3475        
Total dividend     $ 19,400        
Dividend Declared in Q2 2021 | Class A common stock              
Dividends Payable [Line Items]              
Quarterly cash dividend (in dollars per share)   $ 0.3475          
Total dividend   $ 19,300          
Dividend Declared in Q2 2021 | Class B common stock              
Dividends Payable [Line Items]              
Quarterly cash dividend (in dollars per share)   $ 0.3475          
Total dividend   $ 19,300          
Dividend Declared in Q3 2021 | Class A common stock              
Dividends Payable [Line Items]              
Quarterly cash dividend (in dollars per share) $ 0.3475            
Total dividend $ 19,300            
Dividend Declared in Q3 2021 | Class B common stock              
Dividends Payable [Line Items]              
Quarterly cash dividend (in dollars per share) $ 0.3475            
Total dividend $ 19,300