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Capital Stock and Changes in Capital Accounts - Changes in Common Stock (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
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Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2024 | Oct. 31, 2023
Class A common stock |  |  |  |
Changes in Common Stock [Abstract] |  |  |  |
Number of shares, beginning of year (in shares) |  |  | 70,259 | 70,231
Common stock class conversions (in shares) |  |  | 24 | 3
Number of shares issued, end of period (in shares) | 70,283 | 70,234 | 70,283 | 70,234
Changes in Common Stock in Treasury [Abstract] |  |  |  |
Number of shares held, beginning of year (in shares) |  |  | 24,828 | 23,983
Restricted shares issued under stock-based compensation plans (in shares) |  |  | (256) | (384)
Impact of tax withholding on stock-based compensation and other (in shares) |  |  | 96 | 126
Purchases of treasury shares (in shares) | 261 | 367 | 556 | 668
Number of shares held, end of period (in shares) | 25,224 | 24,393 | 25,224 | 24,393
Common stock, shares outstanding (in shares) | 45,059 | 45,841 | 45,059 | 45,841
Class B common stock |  |  |  |
Changes in Common Stock [Abstract] |  |  |  |
Number of shares, beginning of year (in shares) |  |  | 12,923 | 12,951
Common stock class conversions (in shares) |  |  | 24 | 3
Number of shares issued, end of period (in shares) | 12,899 | 12,948 | 12,899 | 12,948
Changes in Common Stock in Treasury [Abstract] |  |  |  |
Number of shares held, beginning of year (in shares) |  |  | 3,928 | 3,925
Purchases of treasury shares (in shares) | 1 | 1 | 1 | 1
Number of shares held, end of period (in shares) | 3,929 | 3,926 | 3,929 | 3,926
Common stock, shares outstanding (in shares) | 8,970 | 9,022 | 8,970 | 9,022

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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://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 Reference 3: 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/1943274/2147479170/946-210-S99-2 Reference 4: 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/1943274/2147479134/946-220-S99-3 Reference 5: 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/1943274/2147479170/946-210-S99-1 Reference 6: 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/1943274/2147479134/946-220-S99-3 + 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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