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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. 13, 2021	Oct. 21, 2020	Jul. 22, 2020	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Cash Dividends [Abstract]
Total Dividend						$ 57,802	$ 57,632
Class A [Member]
Cash Dividends [Abstract]
Quarterly Cash Dividend (in dollars per share)				$ 0.3425	$ 0.34	$ 1.0275	$ 1.02
Class B [Member]
Cash Dividends [Abstract]
Quarterly Cash Dividend (in dollars per share)				$ 0.3425	$ 0.34	$ 1.0275	$ 1.02
Dividend Declared in Q1 2021 [Member] | Class A [Member]
Cash Dividends [Abstract]
Date of Declaration by Board of Directors						Jun. 25, 2020
Quarterly Cash Dividend (in dollars per share)						$ 0.3425
Total Dividend			$ 19,200
Dividend Paid Date						Jul. 22, 2020
Shareholders of Record as of Date						Jul. 07, 2020
Dividend Declared in Q1 2021 [Member] | Class B [Member]
Cash Dividends [Abstract]
Date of Declaration by Board of Directors						Jun. 25, 2020
Quarterly Cash Dividend (in dollars per share)						$ 0.3425
Total Dividend			$ 19,200
Dividend Paid Date						Jul. 22, 2020
Shareholders of Record as of Date						Jul. 07, 2020
Dividend Declared in Q2 2021 [Member] | Class A [Member]
Cash Dividends [Abstract]
Date of Declaration by Board of Directors						Sep. 23, 2020
Quarterly Cash Dividend (in dollars per share)						$ 0.3425
Total Dividend		$ 19,200
Dividend Paid Date						Oct. 21, 2020
Shareholders of Record as of Date						Oct. 06, 2020
Dividend Declared in Q2 2021 [Member] | Class B [Member]
Cash Dividends [Abstract]
Date of Declaration by Board of Directors						Sep. 23, 2020
Quarterly Cash Dividend (in dollars per share)						$ 0.3425
Total Dividend		$ 19,200
Dividend Paid Date						Oct. 21, 2020
Shareholders of Record as of Date						Oct. 06, 2020
Dividend Declared in Q3 2021 [Member] | Class A [Member]
Cash Dividends [Abstract]
Date of Declaration by Board of Directors						Dec. 16, 2020
Quarterly Cash Dividend (in dollars per share)						$ 0.3425
Total Dividend	$ 19,200
Dividend Paid Date						Jan. 13, 2021
Shareholders of Record as of Date						Dec. 30, 2020
Dividend Declared in Q3 2021 [Member] | Class B [Member]
Cash Dividends [Abstract]
Date of Declaration by Board of Directors						Dec. 16, 2020
Quarterly Cash Dividend (in dollars per share)						$ 0.3425
Total Dividend	$ 19,200
Dividend Paid Date						Jan. 13, 2021
Shareholders of Record as of Date						Dec. 30, 2020

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