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Capital Stock and Changes in Capital Accounts, Cash Dividends Paid (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 12 Months Ended
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Apr. 17, 2019 | Mar. 20, 2019 | Jan. 16, 2019 | Dec. 19, 2018 | Oct. 24, 2018 | Sep. 26, 2018 | Jul. 18, 2018 | Jun. 21, 2018 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividends | $ 18,600 |  | $ 18,900 |  | $ 18,900 |  | $ 19,000 |  | $ 75,752 | $ 73,542 | $ 71,545
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.32 | $ 1.28 | $ 1.24
Class A Common Stock [Member] | Dividend Declared in Q1 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Jun. 21, 2018 |  |
Common stock dividend (in dollars per share) |  |  |  |  |  |  |  | $ 0.33 |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Jul. 18, 2018 |  |
Dividend record date |  |  |  |  |  |  |  |  | Jul. 03, 2018 |  |
Class A Common Stock [Member] | Dividend Declared in Q2 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Sep. 26, 2018 |  |
Common stock dividend (in dollars per share) |  |  |  |  |  | $ 0.33 |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Oct. 24, 2018 |  |
Dividend record date |  |  |  |  |  |  |  |  | Oct. 09, 2018 |  |
Class A Common Stock [Member] | Dividend Declared in Q3 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Dec. 19, 2018 |  |
Common stock dividend (in dollars per share) |  |  |  | $ 0.33 |  |  |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Jan. 16, 2019 |  |
Dividend record date |  |  |  |  |  |  |  |  | Jan. 02, 2019 |  |
Class A Common Stock [Member] | Dividend Declared in Q4 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Mar. 20, 2019 |  |
Common stock dividend (in dollars per share) |  | $ 0.33 |  |  |  |  |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Apr. 17, 2019 |  |
Dividend record date |  |  |  |  |  |  |  |  | Apr. 02, 2019 |  |
Class B Common [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.32 | $ 1.28 | $ 1.24
Class B Common [Member] | Dividend Declared in Q1 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Jun. 21, 2018 |  |
Common stock dividend (in dollars per share) |  |  |  |  |  |  |  | $ 0.33 |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Jul. 18, 2018 |  |
Dividend record date |  |  |  |  |  |  |  |  | Jul. 03, 2018 |  |
Class B Common [Member] | Dividend Declared in Q2 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Sep. 26, 2018 |  |
Common stock dividend (in dollars per share) |  |  |  |  |  | $ 0.33 |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Oct. 24, 2018 |  |
Dividend record date |  |  |  |  |  |  |  |  | Oct. 09, 2018 |  |
Class B Common [Member] | Dividend Declared in Q3 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Dec. 19, 2018 |  |
Common stock dividend (in dollars per share) |  |  |  | $ 0.33 |  |  |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Jan. 16, 2019 |  |
Dividend record date |  |  |  |  |  |  |  |  | Jan. 02, 2019 |  |
Class B Common [Member] | Dividend Declared in Q4 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  | Mar. 20, 2019 |  |
Common stock dividend (in dollars per share) |  | $ 0.33 |  |  |  |  |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Apr. 17, 2019 |  |
Dividend record date |  |  |  |  |  |  |  |  | Apr. 02, 2019 |  |

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