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Capital Stock and Changes in Capital Accounts, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jul. 22, 2020 | Jul. 31, 2020 | Jul. 31, 2019
Cash Dividends [Abstract] |  |  |
Total Dividend |  | $ 19,261 | $ 19,252
Class A [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Quarterly Cash Dividend (in dollars per share) |  | $ 0.3425 | $ 0.34
Class B [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Quarterly Cash Dividend (in dollars per share) |  | $ 0.3425 | $ 0.34
Dividend Declared in Q1 2021 [Member] | Class A [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Date of Declaration by Board of Directors |  | Jun. 25, 2020 |
Quarterly Cash Dividend (in dollars per share) |  | $ 0.3425 |
Total Dividend | $ 19,200 |  |
Dividend Paid Date |  | Jul. 22, 2020 |
Shareholders of Record as of Date |  | Jul. 07, 2020 |
Dividend Declared in Q1 2021 [Member] | Class B [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Date of Declaration by Board of Directors |  | Jun. 25, 2020 |
Quarterly Cash Dividend (in dollars per share) |  | $ 0.3425 |
Total Dividend | $ 19,200 |  |
Dividend Paid Date |  | Jul. 22, 2020 |
Shareholders of Record as of Date |  | Jul. 07, 2020 |

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