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Capital Stock and Changes in Capital Accounts, Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Oct. 27, 2021
Jul. 21, 2021
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Cash Dividends [Abstract]            
Total dividend         $ 38,619 $ 38,480
Class A [Member]            
Cash Dividends [Abstract]            
Quarterly cash dividend (in dollars per share)     $ 0.3450 $ 0.3425 $ 0.3450 $ 0.3425
Class B [Member]            
Cash Dividends [Abstract]            
Quarterly cash dividend (in dollars per share)     $ 0.3450 $ 0.3425 $ 0.3450 $ 0.3425
Dividend Declared in Q1 2021 [Member] | Class A [Member]            
Cash Dividends [Abstract]            
Date of declaration by board of directors         Jun. 22, 2021  
Quarterly cash dividend (in dollars per share)         $ 0.3450  
Total dividend   $ 19,300        
Dividend paid date         Jul. 21, 2021  
Shareholders of record as of date         Jul. 06, 2021  
Dividend Declared in Q1 2021 [Member] | Class B [Member]            
Cash Dividends [Abstract]            
Date of declaration by board of directors         Jun. 22, 2021  
Quarterly cash dividend (in dollars per share)         $ 0.3450  
Total dividend   $ 19,300        
Dividend paid date         Jul. 21, 2021  
Shareholders of record as of date         Jul. 06, 2021  
Dividend Declared in Q2 2021 [Member] | Class A [Member]            
Cash Dividends [Abstract]            
Date of declaration by board of directors         Sep. 29, 2021  
Quarterly cash dividend (in dollars per share)         $ 0.3450  
Total dividend $ 19,200          
Dividend paid date         Oct. 27, 2021  
Shareholders of record as of date         Oct. 12, 2021  
Dividend Declared in Q2 2021 [Member] | Class B [Member]            
Cash Dividends [Abstract]            
Date of declaration by board of directors         Sep. 29, 2021  
Total dividend $ 19,200          
Dividend paid date         Oct. 27, 2021  
Shareholders of record as of date         Oct. 12, 2021