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Capital Stock and Changes in Capital Accounts, Changes in Common Stock (Details) - shares shares in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Class A [Member]
Changes in Common Stock [Abstract]
Number of shares, beginning of year (in shares)	70,208	70,166	70,127
Common stock class conversions (in shares)	18	42	39
Number of shares issued, end of year (in shares)	70,226	70,208	70,166
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)	23,419	23,405	22,634
Purchases of treasury shares (in shares)	542	308	1,080
Shares issued under the Director Plan to Directors (in shares)	(2)	(6)	(97)
Restricted shares, forfeited (in shares)	0	0	1
Restricted shares issued from exercise of stock options (in shares)	(49)	(60)	(34)
Shares issued related to the acquisition of a business (in shares)	(129)	0	0
Shares withheld for taxes (in shares)	167	129	122
Other (in shares)	(2)	(1)	(1)
Number of shares held, end of year (in shares)	23,515	23,419	23,405
Number of Common Stock outstanding, end of year (in shares)	46,711	46,789	46,761
Class A [Member] | Non-PSU Awards [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)	(323)	(268)	(232)
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)	(68)
Class B [Member]
Changes in Common Stock [Abstract]
Number of shares, beginning of year (in shares)	12,974	13,016	13,055
Common stock class conversions (in shares)	(18)	(42)	(39)
Number of shares issued, end of year (in shares)	12,956	12,974	13,016
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)	3,922	3,920	3,918
Purchases of treasury shares (in shares)	2	2	2
Number of shares held, end of year (in shares)	3,924	3,922	3,920
Number of Common Stock outstanding, end of year (in shares)	9,032	9,052	9,096

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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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