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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, 2024 | Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2020 | Apr. 30, 2017
Class A |  |  |  |  |
Share Repurchases [Abstract] |  |  |  |  |
Stock repurchased during period (in shares) | 1,294 | 831 | 542 |  |
Treasury stock acquired, average cost per share (usd per share) | $ 34.71 | $ 42.07 | $ 55.14 |  |
Class B |  |  |  |  |
Share Repurchases [Abstract] |  |  |  |  |
Stock repurchased during period (in shares) | 3 | 1 | 2 |  |
Treasury stock acquired, average cost per share (usd per share) | $ 34.71 | $ 42.07 | $ 55.14 |  |
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 | $ 117.4 |  |  |  |
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 |  |  |

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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- Definition Number of shares authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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