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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. 13, 2021 | Oct. 21, 2020 | Jul. 22, 2020 | Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Cash Dividends [Abstract] |  |  |  |  |  |  |
Total Dividend |  |  |  |  |  | $ 57,802 | $ 57,632
Class A [Member] |  |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |  |
Quarterly Cash Dividend (in dollars per share) |  |  |  | $ 0.3425 | $ 0.34 | $ 1.0275 | $ 1.02
Class B [Member] |  |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |  |
Quarterly Cash Dividend (in dollars per share) |  |  |  | $ 0.3425 | $ 0.34 | $ 1.0275 | $ 1.02
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 |
Dividend Declared in Q2 2021 [Member] | Class A [Member] |  |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  | Sep. 23, 2020 |
Quarterly Cash Dividend (in dollars per share) |  |  |  |  |  | $ 0.3425 |
Total Dividend |  | $ 19,200 |  |  |  |  |
Dividend Paid Date |  |  |  |  |  | Oct. 21, 2020 |
Shareholders of Record as of Date |  |  |  |  |  | Oct. 06, 2020 |
Dividend Declared in Q2 2021 [Member] | Class B [Member] |  |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  | Sep. 23, 2020 |
Quarterly Cash Dividend (in dollars per share) |  |  |  |  |  | $ 0.3425 |
Total Dividend |  | $ 19,200 |  |  |  |  |
Dividend Paid Date |  |  |  |  |  | Oct. 21, 2020 |
Shareholders of Record as of Date |  |  |  |  |  | Oct. 06, 2020 |
Dividend Declared in Q3 2021 [Member] | Class A [Member] |  |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  | Dec. 16, 2020 |
Quarterly Cash Dividend (in dollars per share) |  |  |  |  |  | $ 0.3425 |
Total Dividend | $ 19,200 |  |  |  |  |  |
Dividend Paid Date |  |  |  |  |  | Jan. 13, 2021 |
Shareholders of Record as of Date |  |  |  |  |  | Dec. 30, 2020 |
Dividend Declared in Q3 2021 [Member] | Class B [Member] |  |  |  |  |  |  |
Cash Dividends [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  | Dec. 16, 2020 |
Quarterly Cash Dividend (in dollars per share) |  |  |  |  |  | $ 0.3425 |
Total Dividend | $ 19,200 |  |  |  |  |  |
Dividend Paid Date |  |  |  |  |  | Jan. 13, 2021 |
Shareholders of Record as of Date |  |  |  |  |  | Dec. 30, 2020 |

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