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Capital Stock and Changes in Capital Accounts - Share Repurchases (Details) - $ / shares shares in Thousands | 3 Months Ended
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Jul. 31, 2023 | Jul. 31, 2022
Class A common stock |  |
Equity, Class of Treasury Stock [Line Items] |  |
Shares repurchased (in shares) | 301 | 212
Treasury stock acquired (in dollars per share) | $ 33.25 | $ 47.12
Class B common stock |  |
Equity, Class of Treasury Stock [Line Items] |  |
Shares repurchased (in shares) | 0 | 0
Treasury stock acquired (in dollars per share) | $ 33.25 | $ 47.12

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481549/505-30-45-1 + Details
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