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Capital Stock and Changes in Capital Accounts - Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2017
Class A |  |  |  |  |
Share Repurchases [Abstract] |  |  |  |  |
Stock repurchased during period, shares | 831 | 542 | 308 |  |
Treasury stock acquired, average cost per share | $ 42.07 | $ 55.14 | $ 50.93 |  |
Class B |  |  |  |  |
Share Repurchases [Abstract] |  |  |  |  |
Stock repurchased during period, shares | 1 | 2 | 2 |  |
Treasury stock acquired, average cost per share | $ 42.07 | $ 55.14 | $ 50.93 |  |
2017 Share Repurchase Program |  |  |  |  |
Capital Stock [Abstract] |  |  |  |  |
Additional shares of common stock approved for repurchase under the share repurchase program (in shares) |  |  |  |  | 4,000
Stock repurchase program, remaining number of shares authorized to be repurchased |  | 0 |  |  |
2020 Share Repurchase Program |  |  |  |  |
Capital Stock [Abstract] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  | $ 200.0 |
Remaining amount authorized to be repurchased under the share repurchase program | $ 162.5 |  |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + 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 505 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481004/946-505-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -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 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3 Reference 5: 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(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 Reference 7: 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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