Capital Stock and Changes in Capital Accounts, Changes in Common Stock (Details) - shares shares in Thousands	3 Months Ended
Jul. 31, 2022	Jul. 31, 2021
Class A [Member]
Changes in Common Stock [Abstract]
Number of shares, beginning of year (in shares)	70,226	70,208
Common stock class conversions (in shares)	0	3
Number of shares issued, end of period (in shares)	70,226	70,211
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)	23,515	23,419
Purchases of treasury shares (in shares)	212	129
Restricted shares issued from exercise of stock options (in shares)	0	(22)
Shares withheld for taxes (in shares)	98	85
Number of shares held, end of period (in shares)	23,557	23,390
Number of Common Stock outstanding, end of period (in shares)	46,669	46,821
Class A [Member] \| Non-PSU Awards [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)	(119)	(118)
Class A [Member] \| PSU Awards [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)	(149)	(103)
Class B [Member]
Changes in Common Stock [Abstract]
Number of shares, beginning of year (in shares)	12,956	12,974
Common stock class conversions (in shares)	0	(3)
Number of shares issued, end of period (in shares)	12,956	12,971
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)	3,924	3,922
Purchases of treasury shares (in shares)	0	1
Number of shares held, end of period (in shares)	3,924	3,923
Number of Common Stock outstanding, end of period (in shares)	9,032	9,048

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Number, after shares used to satisfy grantee's tax withholding obligation for award under share-based payment arrangement, of restricted shares issued. Excludes cash used to satisfy grantee's tax withholding obligation.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Number of share options (or share units) exercised during the current period.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Number of shares that have been repurchased during the period and are being held in treasury.

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