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Capital Stock and Changes in Capital Accounts, Cash Dividends Paid (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Share repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |
Average purchase price (in dollars per share) |  |  |  |  |  |  |  |  | $ 43.05 | $ 50.35 | $ 55.65
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Dividend | $ 19,000 |  | $ 19,000 |  | $ 19,100 |  | $ 19,200 |  | $ 76,658 | $ 75,752 | $ 73,542
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |
Shares Repurchased (in shares) |  |  |  |  |  |  |  |  | 1,079,936 | 1,191,496 | 713,177
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.36 | $ 1.32 | $ 1.28
Class A Common Stock [Member] | Dividend Declared in Q1 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  |  |  |  | Jun. 27, 2019 |  |
Common stock dividend (in dollars per share) |  |  |  |  |  |  |  | $ 0.34 |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Jul. 24, 2019 |  |
Dividend record date |  |  |  |  |  |  |  |  | Jul. 10, 2019 |  |
Class A Common Stock [Member] | Dividend Declared in Q2 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  |  |  |  | Sep. 26, 2019 |  |
Common stock dividend (in dollars per share) |  |  |  |  |  | $ 0.34 |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Oct. 23, 2019 |  |
Dividend record date |  |  |  |  |  |  |  |  | Oct. 08, 2019 |  |
Class A Common Stock [Member] | Dividend Declared in Q3 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  |  |  |  | Dec. 18, 2019 |  |
Common stock dividend (in dollars per share) |  |  |  | $ 0.34 |  |  |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Jan. 16, 2020 |  |
Dividend record date |  |  |  |  |  |  |  |  | Jan. 02, 2020 |  |
Class A Common Stock [Member] | Dividend Declared in Q4 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  |  |  |  | Mar. 18, 2020 |  |
Common stock dividend (in dollars per share) |  | $ 0.34 |  |  |  |  |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Apr. 15, 2020 |  |
Dividend record date |  |  |  |  |  |  |  |  | Mar. 31, 2020 |  |
Class B Common [Member] |  |  |  |  |  |  |  |  |  |  |
Share repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |
Shares Repurchased (in shares) |  |  |  |  |  |  |  |  | 2,281 | 0 | 0
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.36 | $ 1.32 | $ 1.28
Class B Common [Member] | Dividend Declared in Q1 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  |  |  |  | Jun. 27, 2019 |  |
Common stock dividend (in dollars per share) |  |  |  |  |  |  |  | $ 0.34 |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Jul. 24, 2019 |  |
Dividend record date |  |  |  |  |  |  |  |  | Jul. 10, 2019 |  |
Class B Common [Member] | Dividend Declared in Q2 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  |  |  |  | Sep. 26, 2019 |  |
Common stock dividend (in dollars per share) |  |  |  |  |  | $ 0.34 |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Oct. 23, 2019 |  |
Dividend record date |  |  |  |  |  |  |  |  | Oct. 08, 2019 |  |
Class B Common [Member] | Dividend Declared in Q3 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  |  |  |  | Dec. 18, 2019 |  |
Common stock dividend (in dollars per share) |  |  |  | $ 0.34 |  |  |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Jan. 16, 2020 |  |
Dividend record date |  |  |  |  |  |  |  |  | Jan. 02, 2020 |  |
Class B Common [Member] | Dividend Declared in Q4 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  |  |  |  | Mar. 18, 2020 |  |
Common stock dividend (in dollars per share) |  | $ 0.34 |  |  |  |  |  |  |  |  |
Dividend paid date |  |  |  |  |  |  |  |  | Apr. 15, 2020 |  |
Dividend record date |  |  |  |  |  |  |  |  | Mar. 31, 2020 |  |

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