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Capital Stock and Changes in Capital Accounts, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jul. 21, 2021 | Jul. 31, 2021 | Jul. 31, 2020
Cash Dividends [Abstract] |  |  |
Total dividend |  | $ 19,307 | $ 19,261
Class A [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Quarterly cash dividend (in dollars per share) |  | $ 0.3450 | $ 0.3425
Class B [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Quarterly cash dividend (in dollars per share) |  | $ 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 |

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