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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. 12, 2022 | Oct. 27, 2021 | Jul. 21, 2021 | Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2022 | Jan. 31, 2021
Cash Dividends [Abstract] |  |  |  |  |  |  |
Total dividend |  |  |  |  |  | $ 57,900 | $ 57,802
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 |
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 Q3 2021 [Member] | Class A [Member] |  |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |  |
Date of declaration by board of directors |  |  |  |  |  | Dec. 15, 2021 |
Quarterly cash dividend (in dollars per share) |  |  |  |  |  | $ 0.3450 |
Total dividend | $ 19,200 |  |  |  |  |  |
Dividend paid date |  |  |  |  |  | Jan. 12, 2022 |
Shareholders of record as of date |  |  |  |  |  | Dec. 28, 2021 |
Dividend Declared in Q3 2021 [Member] | Class B [Member] |  |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |  |
Date of declaration by board of directors |  |  |  |  |  | Dec. 15, 2021 |
Quarterly cash dividend (in dollars per share) |  |  |  |  |  | $ 0.3450 |
Total dividend | $ 19,200 |  |  |  |  |  |
Dividend paid date |  |  |  |  |  | Jan. 12, 2022 |
Shareholders of record as of date |  |  |  |  |  | Dec. 28, 2021 |

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