The number of shares of Class A Common Stock into which each share of Class B Common Stock is convertible.

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Common Stock, Number Of Votes For Each Share

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Capital Stock and Changes in Capital Accounts - Narrative (Details) $ in Thousands	12 Months Ended
	Apr. 30, 2026 USD ($) vote shares	Apr. 30, 2025 USD ($)	Apr. 30, 2024 USD ($)	Jul. 31, 2025 USD ($)	Apr. 30, 2020 USD ($)
Class of Stock [Line Items]
Total dividends paid	$ 74,358	$ 76,101	$ 76,964
2020 Share Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 200,000
Share Repurchase Program In 2026
Class of Stock [Line Items]
Stock repurchase program, authorized amount				$ 250,000
Remaining amount authorized to be repurchased under the share repurchase program	$ 207,400
Class A common stock
Class of Stock [Line Items]
Class A common shares into which each share of class B common stock is convertible (in shares) \| shares	1
Percentage of the board of directors elected by class A common stockholders	30.00%
Number of votes to which each share of common stock is entitled \| vote	0.1
Class B common stock
Class of Stock [Line Items]
Number of votes to which each share of common stock is entitled \| vote	1