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Capital Stock and Changes in Capital Accounts - Changes in Common Stock (Details) - shares shares in Thousands | 3 Months Ended
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Jul. 31, 2023 | Jul. 31, 2022
Class A common stock |  |
Changes in Common Stock [Abstract] |  |
Number of shares, beginning of year (in shares) | 70,231 | 70,226
Number of shares issued, end of period (in shares) | 70,231 | 70,226
Changes in Common Stock in Treasury [Abstract] |  |
Number of shares held, beginning of year (in shares) | 23,983 | 23,515
Purchases of treasury shares (in shares) | 301 | 212
Shares withheld for taxes (in shares) | 126 | 98
Number of shares held, end of period (in shares) | 24,049 | 23,557
Common stock, shares outstanding (in shares) | 46,182 | 46,669
Class A common stock | Non-PSU Awards |  |
Changes in Common Stock in Treasury [Abstract] |  |
Restricted shares issued under stock-based compensation plans (in shares) | (128) | (119)
Class A common stock | PSU Awards |  |
Changes in Common Stock in Treasury [Abstract] |  |
Restricted shares issued under stock-based compensation plans (in shares) | (233) | (149)
Class B common stock |  |
Changes in Common Stock [Abstract] |  |
Number of shares, beginning of year (in shares) | 12,951 | 12,956
Number of shares issued, end of period (in shares) | 12,951 | 12,956
Changes in Common Stock in Treasury [Abstract] |  |
Number of shares held, beginning of year (in shares) | 3,925 | 3,924
Purchases of treasury shares (in shares) | 0 | 0
Number of shares held, end of period (in shares) | 3,925 | 3,924
Common stock, shares outstanding (in shares) | 9,026 | 9,032

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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