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Capital Stock and Changes in Capital Accounts (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 16, 2020 | Oct. 23, 2019 | Jul. 24, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Cash dividends [Abstract] |  |  |  |  |  |  |
Total Dividend |  |  |  |  |  | $ 57,632 | $ 56,963
Dividend Declared in Q1 2020 [Member] |  |  |  |  |  |  |
Cash dividends [Abstract] |  |  |  |  |  |  |
Total Dividend |  |  | $ 19,200 |  |  |  |
Dividend Declared in Q2 2020 [Member] |  |  |  |  |  |  |
Cash dividends [Abstract] |  |  |  |  |  |  |
Total Dividend |  | $ 19,100 |  |  |  |  |
Dividend Declared in Q3 2020 [Member] |  |  |  |  |  |  |
Cash dividends [Abstract] |  |  |  |  |  |  |
Total Dividend | $ 19,000 |  |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |
Share repurchases [Abstract] |  |  |  |  |  |  |
Shares Repurchased (in shares) |  |  |  | 205,370 | 208,711 | 757,217 | 633,831
Average Price (in dollars per share) |  |  |  | $ 48.69 | $ 47.91 | $ 46.22 | $ 55.21
Cash dividends [Abstract] |  |  |  |  |  |  |
Quarterly Cash Dividend (in dollars per share) |  |  |  | $ 0.34 | $ 0.33 | $ 1.02 | $ 0.99
Changes in Common Stock [Abstract] |  |  |  |  |  |  |
Number of shares, beginning of year (in shares) |  |  |  |  |  | 70,127,000 | 70,111,000
Common stock class conversions (in shares) |  |  |  |  |  | 29,000 | 14,000
Number of shares issued, end of period (in shares) |  |  |  | 70,156,000 | 70,125,000 | 70,156,000 | 70,125,000
Changes in Common Stock in Treasury [Abstract] |  |  |  |  |  |  |
Number of shares held, beginning of year (in shares) |  |  |  |  |  | 22,634,000 | 21,853,000
Purchase of treasury shares (in shares) |  |  |  |  |  | 757,000 | 634,000
Restricted shares, forfeited (in shares) |  |  |  |  |  | 1,000 | 0
Restricted shares issued from exercise of stock options (in shares) |  |  |  |  |  | (34,000) | (224,000)
Shares withheld for taxes (in shares) |  |  |  |  |  | 63,000 | 71,000
Other (in shares) |  |  |  |  |  | 0 | 6,000
Number of shares held, end of period (in shares) |  |  |  | 23,224,000 | 22,190,000 | 23,224,000 | 22,190,000
Number of Common Stock outstanding, end of period (in shares) |  |  |  | 46,932,000 | 47,935,000 | 46,932,000 | 47,935,000
Class A [Member] | Dividend Declared in Q1 2020 [Member] |  |  |  |  |  |  |
Cash dividends [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  | Jun. 27, 2019 |
Quarterly Cash Dividend (in dollars per share) |  |  |  |  |  | $ 0.34 |
Dividend Paid Date |  |  |  |  |  | Jul. 24, 2019 |
Shareholders of Record as of Date |  |  |  |  |  | Jul. 10, 2019 |
Class A [Member] | Dividend Declared in Q2 2020 [Member] |  |  |  |  |  |  |
Cash dividends [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  | Sep. 26, 2019 |
Quarterly Cash Dividend (in dollars per share) |  |  |  |  |  | $ 0.34 |
Dividend Paid Date |  |  |  |  |  | Oct. 23, 2019 |
Shareholders of Record as of Date |  |  |  |  |  | Oct. 08, 2019 |
Class A [Member] | Dividend Declared in Q3 2020 [Member] |  |  |  |  |  |  |
Cash dividends [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  | Dec. 18, 2019 |
Quarterly Cash Dividend (in dollars per share) |  |  |  |  |  | $ 0.34 |
Dividend Paid Date |  |  |  |  |  | Jan. 16, 2020 |
Shareholders of Record as of Date |  |  |  |  |  | Jan. 02, 2020 |
Class A [Member] | Non-Performance Shares [Member] |  |  |  |  |  |  |
Changes in Common Stock in Treasury [Abstract] |  |  |  |  |  |  |
Restricted shares issued under stock-based compensation plans (in shares) |  |  |  |  |  | (154,000) | (91,000)
Class A [Member] | Performance Share Units [Member] |  |  |  |  |  |  |
Changes in Common Stock in Treasury [Abstract] |  |  |  |  |  |  |
Restricted shares issued under stock-based compensation plans (in shares) |  |  |  |  |  | (43,000) | (59,000)
Class B [Member] |  |  |  |  |  |  |
Cash dividends [Abstract] |  |  |  |  |  |  |
Quarterly Cash Dividend (in dollars per share) |  |  |  | $ 0.34 | $ 0.33 | $ 1.02 | $ 0.99
Changes in Common Stock [Abstract] |  |  |  |  |  |  |
Number of shares, beginning of year (in shares) |  |  |  |  |  | 13,055,000 | 13,071,000
Common stock class conversions (in shares) |  |  |  |  |  | (29,000) | (14,000)
Number of shares issued, end of period (in shares) |  |  |  | 13,026,000 | 13,057,000 | 13,026,000 | 13,057,000
Changes in Common Stock in Treasury [Abstract] |  |  |  |  |  |  |
Number of shares held, beginning of year (in shares) |  |  |  |  |  | 3,918,000 | 3,918,000
Number of shares held, end of period (in shares) |  |  |  | 3,918,000 | 3,918,000 | 3,918,000 | 3,918,000
Number of Common Stock outstanding, end of period (in shares) |  |  |  | 9,108,000 | 9,139,000 | 9,108,000 | 9,139,000
Class B [Member] | Dividend Declared in Q1 2020 [Member] |  |  |  |  |  |  |
Cash dividends [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  | Jun. 27, 2019 |
Quarterly Cash Dividend (in dollars per share) |  |  |  |  |  | $ 0.34 |
Dividend Paid Date |  |  |  |  |  | Jul. 24, 2019 |
Shareholders of Record as of Date |  |  |  |  |  | Jul. 10, 2019 |
Class B [Member] | Dividend Declared in Q2 2020 [Member] |  |  |  |  |  |  |
Cash dividends [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  | Sep. 26, 2019 |
Quarterly Cash Dividend (in dollars per share) |  |  |  |  |  | $ 0.34 |
Dividend Paid Date |  |  |  |  |  | Oct. 23, 2019 |
Shareholders of Record as of Date |  |  |  |  |  | Oct. 08, 2019 |
Class B [Member] | Dividend Declared in Q3 2020 [Member] |  |  |  |  |  |  |
Cash dividends [Abstract] |  |  |  |  |  |  |
Date of Declaration by Board of Directors |  |  |  |  |  | Dec. 18, 2019 |
Quarterly Cash Dividend (in dollars per share) |  |  |  |  |  | $ 0.34 |
Dividend Paid Date |  |  |  |  |  | Jan. 16, 2020 |
Shareholders of Record as of Date |  |  |  |  |  | Jan. 02, 2020 |

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