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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
--- | --- | --- | --- | --- | ---
Dec. 14, 2023 | Sep. 28, 2023 | Jun. 26, 2023 | Jan. 31, 2024 | Jan. 31, 2023 | Jan. 31, 2024 | Jan. 31, 2023
Dividends Payable [Line Items] |  |  |  |  |  |  |
Total dividend | $ 19,200 | $ 19,300 | $ 19,400 |  |  | $ 57,869 | $ 58,067
Class A common stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Quarterly cash dividend (in dollars per share) | $ 0.3500 | $ 0.3500 | $ 0.3500 | $ 0.3500 | $ 0.3475 | $ 0.3500 | $ 0.3475
Class B common stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Quarterly cash dividend (in dollars per share) | $ 0.3500 | $ 0.3500 | $ 0.3500 | $ 0.3500 | $ 0.3475 | $ 0.3500 | $ 0.3475

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