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Capital Stock and Changes in Capital Accounts, Changes in Common Stock (Details) - shares shares in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
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)	3	11
Number of shares issued, end of period (in shares)	70,211	70,177
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)	23,419	23,405
Purchase of treasury shares (in shares)	129	0
Restricted shares issued from exercise of stock options (in shares)	(22)	(33)
Shares withheld for taxes (in shares)	85	67
Number of shares held, end of period (in shares)	23,390	23,259
Number of Common Stock outstanding, end of period (in shares)	46,821	46,918
Class A [Member] | Non-PSU Awards [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)	(118)	(94)
Class A [Member] | PSU Awards [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)	(103)	(86)
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)	(3)	(11)
Number of shares issued, end of period (in shares)	12,971	13,005
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)	3,922	3,920
Purchase of treasury shares (in shares)	1	0
Number of shares held, end of period (in shares)	3,923	3,920
Number of Common Stock outstanding, end of period (in shares)	9,048	9,085

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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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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 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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