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Capital Stock and Changes in Capital Accounts - Share Repurchases (Details) - $ / shares shares in Thousands | 12 Months Ended
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Apr. 30, 2026 | Apr. 30, 2025 | Apr. 30, 2024
Class A common stock |  |  |
Share Repurchases [Abstract] |  |  |
Stock repurchased during period (in shares) | 2,843 | 1,186 | 1,294
Average price - Class A and Class B (usd per share) | $ 35.08 | $ 44.16 | $ 34.71
Class B common stock |  |  |
Share Repurchases [Abstract] |  |  |
Stock repurchased during period (in shares) | 7 | 173 | 3
Average price - Class A and Class B (usd per share) | $ 35.08 | $ 44.16 | $ 34.71

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