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Capital Stock and Changes in Capital Accounts, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Oct. 21, 2020	Jul. 22, 2020	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Cash Dividends [Abstract]
Total Dividend					$ 38,480	$ 38,486
Class A [Member]
Cash Dividends [Abstract]
Quarterly Cash Dividend (in dollars per share)			$ 0.3425	$ 0.34	$ 0.3425	$ 0.34
Class B [Member]
Cash Dividends [Abstract]
Quarterly Cash Dividend (in dollars per share)			$ 0.3425	$ 0.34	$ 0.3425	$ 0.34
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

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-Publisher FASB
-Name Accounting Standards Codification
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