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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
	Jan. 12, 2022	Oct. 27, 2021	Jul. 21, 2021	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Cash Dividends [Abstract]
Total dividend						$ 57,900	$ 57,802
Class A [Member]
Cash Dividends [Abstract]
Quarterly cash dividend (in dollars per share)				$ 0.3450	$ 0.3425	$ 0.3450	$ 0.3425
Class B [Member]
Cash Dividends [Abstract]
Quarterly cash dividend (in dollars per share)				$ 0.3450	$ 0.3425	$ 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
Dividend Declared in Q2 2021 [Member] | Class A [Member]
Cash Dividends [Abstract]
Date of declaration by board of directors						Sep. 29, 2021
Quarterly cash dividend (in dollars per share)						$ 0.3450
Total dividend		$ 19,200
Dividend paid date						Oct. 27, 2021
Shareholders of record as of date						Oct. 12, 2021
Dividend Declared in Q2 2021 [Member] | Class B [Member]
Cash Dividends [Abstract]
Date of declaration by board of directors						Sep. 29, 2021
Quarterly cash dividend (in dollars per share)						$ 0.3450
Total dividend		$ 19,200
Dividend paid date						Oct. 27, 2021
Shareholders of record as of date						Oct. 12, 2021
Dividend Declared in Q3 2021 [Member] | Class A [Member]
Cash Dividends [Abstract]
Date of declaration by board of directors						Dec. 15, 2021
Quarterly cash dividend (in dollars per share)						$ 0.3450
Total dividend	$ 19,200
Dividend paid date						Jan. 12, 2022
Shareholders of record as of date						Dec. 28, 2021
Dividend Declared in Q3 2021 [Member] | Class B [Member]
Cash Dividends [Abstract]
Date of declaration by board of directors						Dec. 15, 2021
Quarterly cash dividend (in dollars per share)						$ 0.3450
Total dividend	$ 19,200
Dividend paid date						Jan. 12, 2022
Shareholders of record as of date						Dec. 28, 2021

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