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Capital Stock and Changes in Capital Accounts, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jul. 20, 2022 | Jul. 31, 2022 | Jul. 31, 2021
Cash Dividends [Abstract] |  |  |
Total dividend |  | $ 19,468 | $ 19,307
Class A [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Quarterly cash dividend (in dollars per share) |  | $ 0.3475 | $ 0.3450
Class B [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Quarterly cash dividend (in dollars per share) |  | $ 0.3475 | $ 0.3450
Dividend Declared in Q1 2023 [Member] | Class A [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Date of declaration by board of directors |  | Jun. 22, 2022 |
Quarterly cash dividend (in dollars per share) |  | $ 0.3475 |
Total dividend | $ 19,400 |  |
Dividend paid date |  | Jul. 20, 2022 |
Shareholders of record as of date |  | Jul. 06, 2022 |
Dividend Declared in Q1 2023 [Member] | Class B [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Date of declaration by board of directors |  | Jun. 22, 2022 |
Quarterly cash dividend (in dollars per share) |  | $ 0.3475 |
Total dividend | $ 19,400 |  |
Dividend paid date |  | Jul. 20, 2022 |
Shareholders of record as of date |  | Jul. 06, 2022 |

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