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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, 2020	Jul. 31, 2019
Class A [Member]
Changes in Common Stock [Abstract]
Number of shares, beginning of year (in shares)	70,166	70,127
Common stock class conversions (in shares)	11	12
Number of shares issued, end of period (in shares)	70,177	70,139
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)	23,405	22,634
Purchase of treasury shares (in shares)	0	218
Restricted shares, forfeited (in shares)	0	1
Restricted shares issued from exercise of stock options (in shares)	(33)	(12)
Shares withheld for taxes (in shares)	67	33
Number of shares held, end of period (in shares)	23,259	22,795
Number of Common Stock outstanding, end of period (in shares)	46,918	47,344
Class A [Member] | Non-PSU Awards [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)	(94)	(36)
Class A [Member] | PSU Awards [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)	(86)	(43)
Class B [Member]
Changes in Common Stock [Abstract]
Number of shares, beginning of year (in shares)	13,016	13,055
Common stock class conversions (in shares)	(11)	(12)
Number of shares issued, end of period (in shares)	13,005	13,043
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)	3,920	3,918
Number of shares held, end of period (in shares)	3,920	3,918
Number of Common Stock outstanding, end of period (in shares)	9,085	9,125

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

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