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Capital Stock and Changes in Capital Accounts (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jul. 24, 2019 | Jul. 31, 2019 | Jul. 31, 2018
Cash dividend [Abstract] |  |  |
Cash dividends |  | $ 19,252 | $ 19,043
Dividend Declared in Q1 2020 [Member] |  |  |
Cash dividend [Abstract] |  |  |
Cash dividends | $ 19,200 |  |
Class A [Member] |  |  |
Share repurchases [Abstract] |  |  |
Shares repurchased (in shares) |  | 217,511 | 125,932
Average purchase price (in dollars per share) |  | $ 45.97 | $ 63.48
Cash dividend [Abstract] |  |  |
Common stock (in dollars per share) |  | $ 0.34 | $ 0.33
Changes in Common Stock [Abstract] |  |  |
Number of shares, beginning of year (in shares) |  | 70,126,963 | 70,111,000
Common stock class conversions and other |  | 12,000 | 4,000
Number of shares issued, end of period (in shares) |  | 70,138,555 | 70,115,000
Changes in Common Stock in Treasury [Abstract] |  |  |
Number of shares held, beginning of year (in shares) |  | 22,633,869 | 21,853,000
Purchase of treasury shares (in shares) |  | 218,000 | 126,000
Restricted shares, forfeited (in shares) |  | 1,000 | 0
Restricted shares issued from exercise of stock options (in shares) |  | (12,000) | (221,000)
Shares withheld for taxes (in shares) |  | 33,000 | 41,000
Other (in shares) |  | 0 | 4,000
Number of shares held, end of period (in shares) |  | 22,795,256 | 21,722,000
Number of Common Stock outstanding, end of period (in shares) |  | 47,344,000 | 48,393,000
Class A [Member] | Non-Performance Shares [Member] |  |  |
Changes in Common Stock in Treasury [Abstract] |  |  |
Restricted shares issued under stock-based compensation plans (in shares) |  | (36,000) | (22,000)
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 A [Member] | Dividend Declared in Q1 2020 [Member] |  |  |
Cash dividend [Abstract] |  |  |
Dividend declared date |  | Jun. 27, 2019 |
Common stock (in dollars per share) |  | $ 0.34 |
Dividend paid date |  | Jul. 24, 2019 |
Dividend record date |  | Jul. 10, 2019 |
Class B [Member] |  |  |
Cash dividend [Abstract] |  |  |
Common stock (in dollars per share) |  | $ 0.34 | $ 0.33
Changes in Common Stock [Abstract] |  |  |
Number of shares, beginning of year (in shares) |  | 13,054,707 | 13,071,000
Common stock class conversions and other |  | (12,000) | (4,000)
Number of shares issued, end of period (in shares) |  | 13,043,115 | 13,067,000
Changes in Common Stock in Treasury [Abstract] |  |  |
Number of shares held, beginning of year (in shares) |  | 3,917,574 | 3,918,000
Number of shares held, end of period (in shares) |  | 3,917,574 | 3,918,000
Number of Common Stock outstanding, end of period (in shares) |  | 9,125,000 | 9,149,000
Class B [Member] | Dividend Declared in Q1 2020 [Member] |  |  |
Cash dividend [Abstract] |  |  |
Dividend declared date |  | Jun. 27, 2019 |
Common stock (in dollars per share) |  | $ 0.34 |
Dividend paid date |  | Jul. 24, 2019 |
Dividend record date |  | Jul. 10, 2019 |

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