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Capital Stock and Changes in Capital Accounts, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jul. 21, 2021	Jul. 31, 2021	Jul. 31, 2020
Cash Dividends [Abstract]
Total dividend		$ 19,307	$ 19,261
Class A [Member]
Cash Dividends [Abstract]
Quarterly cash dividend (in dollars per share)		$ 0.3450	$ 0.3425
Class B [Member]
Cash Dividends [Abstract]
Quarterly cash dividend (in dollars per share)		$ 0.3450	$ 0.3425
Dividend Declared in Q1 2021 [Member] | Class A [Member]
Cash Dividends [Abstract]
Date of declaration by board of directors		Jun. 22, 2021
Quarterly cash dividend (in dollars per share)		$ 0.3450
Total dividend	$ 19,300
Dividend paid date		Jul. 21, 2021
Shareholders of record as of date		Jul. 06, 2021
Dividend Declared in Q1 2021 [Member] | Class B [Member]
Cash Dividends [Abstract]
Date of declaration by board of directors		Jun. 22, 2021
Quarterly cash dividend (in dollars per share)		$ 0.3450
Total dividend	$ 19,300
Dividend paid date		Jul. 21, 2021
Shareholders of record as of date		Jul. 06, 2021

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