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Capital Stock and Changes in Capital Accounts - Changes in Common Stock (Details) - shares | 12 Months Ended
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Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Class A |  |  |
Changes in Common Stock [Abstract] |  |  |
Number of shares, beginning of year (in shares) | 70,226,000 | 70,208,000 | 70,166,000
Common stock class conversions (in shares) | 5,000 | 18,000 | 42,000
Number of shares issued, end of year (in shares) | 70,231,000 | 70,226,000 | 70,208,000
Changes in Common Stock in Treasury [Abstract] |  |  |
Number of shares held, beginning of year (in shares) | 23,515,000 | 23,419,000 | 23,405,000
Purchases of treasury shares (in shares) | 831,000 | 542,000 | 308,000
Shares issued to directors (in shares) | 0 | (2,000) | (6,000)
Restricted shares issued from exercise of stock options (in shares) | (14,000) | (49,000) | (60,000)
Shares issued related to the acquisition of a business (in shares) | 0 | (129,000) | 0
Shares withheld for taxes (in shares) | 195,000 | 167,000 | 129,000
Other (in shares) | 0 | (2,000) | (1,000)
Number of shares held, end of year (in shares) | 23,983,000 | 23,515,000 | 23,419,000
Number of Class A Common Stock outstanding, end of year (in shares) | 46,248,000 | 46,711,000 | 46,789,000
Class A | Non-PSU Awards |  |  |
Changes in Common Stock in Treasury [Abstract] |  |  |
Restricted shares issued under stock-based compensation plans (in shares) | (394,000) | (323,000) | (268,000)
Class A | PSU Awards |  |  |
Changes in Common Stock in Treasury [Abstract] |  |  |
Restricted shares issued under stock-based compensation plans (in shares) | (150,000) | (108,000) | (88,000)
Class B |  |  |
Changes in Common Stock [Abstract] |  |  |
Number of shares, beginning of year (in shares) | 12,956,000 | 12,974,000 | 13,016,000
Common stock class conversions (in shares) | (5,000) | (18,000) | (42,000)
Number of shares issued, end of year (in shares) | 12,951,000 | 12,956,000 | 12,974,000
Changes in Common Stock in Treasury [Abstract] |  |  |
Number of shares held, beginning of year (in shares) | 3,924,000 | 3,922,000 | 3,920,000
Purchases of treasury shares (in shares) | 1,000 | 2,000 | 2,000
Number of shares held, end of year (in shares) | 3,925,000 | 3,924,000 | 3,922,000
Number of Class A Common Stock outstanding, end of year (in shares) | 9,026,000 | 9,032,000 | 9,052,000

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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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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 6: 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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-5 + Details
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