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Capital Stock and Changes in Capital Accounts - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Apr. 20, 2022	Jan. 12, 2022	Oct. 27, 2021	Jul. 21, 2021	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Dividends Payable [Line Items]
Total dividend					$ 77,298	$ 77,205	$ 76,938
Class A
Dividends Payable [Line Items]
Common stock dividend (in dollars per share)					$ 1.39	$ 1.38	$ 1.37
Class A | Dividend Declared in Q1 2023
Dividends Payable [Line Items]
Common stock dividend (in dollars per share)					0.3475
Total dividend				$ 19,400
Class A | Dividend Declared in Q2 2023
Dividends Payable [Line Items]
Common stock dividend (in dollars per share)					0.3475
Total dividend			$ 19,300
Class A | Dividend Declared in Q3 2023
Dividends Payable [Line Items]
Common stock dividend (in dollars per share)					0.3475
Total dividend		$ 19,300
Class A | Dividend Declared in Q4 2023
Dividends Payable [Line Items]
Common stock dividend (in dollars per share)					0.3475
Total dividend	$ 19,200
Class B
Dividends Payable [Line Items]
Common stock dividend (in dollars per share)					1.39	$ 1.38	$ 1.37
Class B | Dividend Declared in Q1 2023
Dividends Payable [Line Items]
Common stock dividend (in dollars per share)					0.3475
Total dividend				$ 19,400
Class B | Dividend Declared in Q2 2023
Dividends Payable [Line Items]
Common stock dividend (in dollars per share)					0.3475
Total dividend			$ 19,300
Class B | Dividend Declared in Q3 2023
Dividends Payable [Line Items]
Common stock dividend (in dollars per share)					0.3475
Total dividend		$ 19,300
Class B | Dividend Declared in Q4 2023
Dividends Payable [Line Items]
Common stock dividend (in dollars per share)					$ 0.3475
Total dividend	$ 19,200

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

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- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

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