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Capital Stock and Changes in Capital Accounts (Details) | 12 Months Ended
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Apr. 30, 2018 Vote $ / shares shares | Apr. 30, 2017 $ / shares shares
2017 Share Repurchase Program [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Additional shares of common stock approved for repurchase under the share repurchase program (in shares) |  | 4,000,000
Number of shares repurchased during the period (in shares) |  | 953,188
Average price of shares repurchased during the period (in dollars per share) | $ / shares |  | $ 52.80
Remaining number of shares authorized to be repurchased under the share repurchase program (in shares) | 3,080,471 |
Class A [Member] |  |
Common Stock [Abstract] |  |
Class A Common shares into which each share of Class B Common Stock is convertible (in shares) | 1 |
Percentage of the Board of Directors elected by Class A common stockholders | 30.00% |
Number of votes to which each share of common stock is entitled | Vote | 0.1 |
Class A [Member] | 2017 Share Repurchase Program [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Number of shares repurchased during the period (in shares) | 713,177 | 952,667
Average price of shares repurchased during the period (in dollars per share) | $ / shares | $ 55.65 |
Class B [Member] |  |
Common Stock [Abstract] |  |
Number of votes to which each share of common stock is entitled | Vote | 1 |
Class B [Member] | 2017 Share Repurchase Program [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Number of shares repurchased during the period (in shares) |  | 521

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