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Capital Stock and Changes in Capital Accounts, Changes in Common Stock (Details) - shares shares in Thousands	9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Class A [Member]
Changes in Common Stock [Abstract]
Number of shares, beginning of year (in shares)	70,208	70,166
Common stock class conversions (in shares)	10	42
Number of shares issued, end of period (in shares)	70,218	70,208
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)	23,419	23,405
Purchases of treasury shares (in shares)	446	146
Shares issued under the Director Plan to Directors (in shares)	(2)	(6)
Restricted shares issued from exercise of stock options (in shares)	(24)	(33)
Shares issued related to the acquisition of a business (in shares)	(129)	0
Shares withheld for taxes (in shares)	110	70
Number of shares held, end of period (in shares)	23,549	23,394
Number of Common Stock outstanding, end of period (in shares)	46,669	46,814
Class A [Member] | Non-PSU Awards [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)	(163)	(100)
Class A [Member] | PSU Awards [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)	(108)	(88)
Class B [Member]
Changes in Common Stock [Abstract]
Number of shares, beginning of year (in shares)	12,974	13,016
Common stock class conversions (in shares)	(10)	(42)
Number of shares issued, end of period (in shares)	12,964	12,974
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)	3,922	3,920
Purchases of treasury shares (in shares)	2	1
Number of shares held, end of period (in shares)	3,924	3,921
Number of Common Stock outstanding, end of period (in shares)	9,040	9,053

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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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