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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
	Dec. 14, 2023	Sep. 28, 2023	Jun. 26, 2023	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Dividends Payable [Line Items]
Total dividend	$ 19,200	$ 19,300	$ 19,400			$ 57,869	$ 58,067
Class A common stock
Dividends Payable [Line Items]
Quarterly cash dividend (in dollars per share)	$ 0.3500	$ 0.3500	$ 0.3500	$ 0.3500	$ 0.3475	$ 0.3500	$ 0.3475
Class B common stock
Dividends Payable [Line Items]
Quarterly cash dividend (in dollars per share)	$ 0.3500	$ 0.3500	$ 0.3500	$ 0.3500	$ 0.3475	$ 0.3500	$ 0.3475

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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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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