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Capital Stock and Changes in Capital Accounts, Changes in Common Stock (Details) - shares shares in Thousands | 9 Months Ended
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Jan. 31, 2021 | Jan. 31, 2020
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) | 42 | 29
Number of shares issued, end of period (in shares) | 70,208 | 70,156
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) | 146 | 757
Shares issued under the Director Stock Plan to Directors (in shares) | (6) | 0
Restricted shares, forfeited (in shares) | 0 | 1
Restricted shares issued from exercise of stock options (in shares) | (33) | (34)
Shares withheld for taxes (in shares) | 70 | 63
Number of shares held, end of period (in shares) | 23,394 | 23,224
Number of Common Stock outstanding, end of period (in shares) | 46,814 | 46,932
Class A [Member] | Non-PSU Awards [Member] |  |
Changes in Common Stock in Treasury [Abstract] |  |
Restricted shares issued under stock-based compensation plans (in shares) | (100) | (154)
Class A [Member] | PSU Awards [Member] |  |
Changes in Common Stock in Treasury [Abstract] |  |
Restricted shares issued under stock-based compensation plans (in shares) | (88) | (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) | (42) | (29)
Number of shares issued, end of period (in shares) | 12,974 | 13,026
Changes in Common Stock in Treasury [Abstract] |  |
Number of shares held, beginning of year (in shares) | 3,920 | 3,918
Purchase of treasury shares (in shares) | 1 | 0
Number of shares held, end of period (in shares) | 3,921 | 3,918
Number of Common Stock outstanding, end of period (in shares) | 9,053 | 9,108

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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