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Capital Stock and Changes in Capital Accounts, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 21, 2021 | Jan. 13, 2021 | Oct. 21, 2020 | Jul. 22, 2020 | Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Cash dividend [Abstract] |  |  |  |  |  |  |
Total Dividend |  |  |  |  | $ 76,938 | $ 76,658 | $ 75,752
Class A [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Common stock dividend (in dollars per share) |  |  |  |  | $ 1.37 | $ 1.36 | $ 1.32
Class A [Member] | Dividend Declared in Q1 2021 [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  | Jun. 25, 2020 |  |
Common stock dividend (in dollars per share) |  |  |  |  | $ 0.3425 |  |
Total Dividend |  |  |  | $ 19,200 |  |  |
Dividend paid date |  |  |  |  | Jul. 22, 2020 |  |
Dividend record date |  |  |  |  | Jul. 07, 2020 |  |
Class A [Member] | Dividend Declared in Q2 2021 [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  | Sep. 23, 2020 |  |
Common stock dividend (in dollars per share) |  |  |  |  | $ 0.3425 |  |
Total Dividend |  |  | $ 19,200 |  |  |  |
Dividend paid date |  |  |  |  | Oct. 21, 2020 |  |
Dividend record date |  |  |  |  | Oct. 06, 2020 |  |
Class A [Member] | Dividend Declared in Q3 2021 [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  | Dec. 16, 2020 |  |
Common stock dividend (in dollars per share) |  |  |  |  | $ 0.3425 |  |
Total Dividend |  | $ 19,200 |  |  |  |  |
Dividend paid date |  |  |  |  | Jan. 13, 2021 |  |
Dividend record date |  |  |  |  | Dec. 30, 2020 |  |
Class A [Member] | Dividend Declared in Q4 2021 [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  | Mar. 24, 2021 |  |
Common stock dividend (in dollars per share) |  |  |  |  | $ 0.3425 |  |
Total Dividend | $ 19,100 |  |  |  |  |  |
Dividend paid date |  |  |  |  | Apr. 21, 2021 |  |
Dividend record date |  |  |  |  | Apr. 06, 2021 |  |
Class B [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Common stock dividend (in dollars per share) |  |  |  |  | $ 1.37 | $ 1.36 | $ 1.32
Class B [Member] | Dividend Declared in Q1 2021 [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  | Jun. 25, 2020 |  |
Common stock dividend (in dollars per share) |  |  |  |  | $ 0.3425 |  |
Total Dividend |  |  |  | $ 19,200 |  |  |
Dividend paid date |  |  |  |  | Jul. 22, 2020 |  |
Dividend record date |  |  |  |  | Jul. 07, 2020 |  |
Class B [Member] | Dividend Declared in Q2 2021 [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  | Sep. 23, 2020 |  |
Common stock dividend (in dollars per share) |  |  |  |  | $ 0.3425 |  |
Total Dividend |  |  | $ 19,200 |  |  |  |
Dividend paid date |  |  |  |  | Oct. 21, 2020 |  |
Dividend record date |  |  |  |  | Oct. 06, 2020 |  |
Class B [Member] | Dividend Declared in Q3 2021 [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  | Dec. 16, 2020 |  |
Common stock dividend (in dollars per share) |  |  |  |  | $ 0.3425 |  |
Total Dividend |  | $ 19,200 |  |  |  |  |
Dividend paid date |  |  |  |  | Jan. 13, 2021 |  |
Dividend record date |  |  |  |  | Dec. 30, 2020 |  |
Class B [Member] | Dividend Declared in Q4 2021 [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  | Mar. 24, 2021 |  |
Common stock dividend (in dollars per share) |  |  |  |  | $ 0.3425 |  |
Total Dividend | $ 19,100 |  |  |  |  |  |
Dividend paid date |  |  |  |  | Apr. 21, 2021 |  |
Dividend record date |  |  |  |  | Apr. 06, 2021 |  |

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