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Capital Stock and Changes in Capital Accounts (Tables) | 12 Months Ended
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Apr. 30, 2019
Capital Stock and Changes in Capital Accounts [Abstract] |
Summary of Changes of Common Stock and Common Stock in Treasury | The following is a summary of changes during the years ended April 30, in shares of our common stock and common stock in treasury (shares in thousands).
Changes in Common Stock A: | 2019 |  | 2018 |  | 2017
Number of shares, beginning of year |  | 70,111 |  |  | 70,086 |  |  | 69,798
Common stock class conversions and other |  | 16 |  |  | 25 |  |  | 288
Number of shares issued, end of year |  | 70,127 |  |  | 70,111 |  |  | 70,086
Changes in Common Stock A in treasury: |  |  |  |  |  |  |  |
Number of shares held, beginning of year |  | 21,853 |  |  | 22,097 |  |  | 21,709
Purchase of treasury shares |  | 1,192 |  |  | 713 |  |  | 953
Restricted shares issued under stock-based compensation plans - non-PSU Awards |  | (210) |  |  | (153) |  |  | (74)
Restricted shares issued under stock-based compensation plans - PSU Awards |  | (110) |  |  | (126) |  |  | (186)
Stock grants of fully vested Class A shares - common stock |  | — |  |  | (20) |  |  | (24)
Restricted shares, forfeited |  | 9 |  |  | 15 |  |  | 8
Restricted shares issued from exercise of stock options |  | (229) |  |  | (788) |  |  | (469)
Shares withheld for taxes |  | 130 |  |  | 116 |  |  | 97
Other |  | (1) |  |  | (1) |  |  | 83
Number of shares held, end of year |  | 22,634 |  |  | 21,853 |  |  | 22,097
Number of Common Stock A outstanding, end of year |  | 47,493 |  |  | 48,258 |  |  | 47,989
Changes in Common Stock B: | 2019 |  | 2018 |  | 2017
Number of shares, beginning of year |  | 13,071 |  |  | 13,096 |  |  | 13,392
Common stock class conversions and other |  | (16) |  |  | (25) |  |  | (296)
Number of shares issued, end of year |  | 13,055 |  |  | 13,071 |  |  | 13,096
Changes in Common Stock B in treasury: |  |  |  |  |  |  |  |
Number of shares held, beginning of year |  | 3,918 |  |  | 3,918 |  |  | 3,917
Shares repurchased |  | — |  |  | — |  |  | 1
Number of shares held, end of year |  | 3,918 |  |  | 3,918 |  |  | 3,918
Number of Common Stock B outstanding, end of year |  | 9,137 |  |  | 9,153 |  |  | 9,178
Cash Dividends Paid | The following table summarizes the cash dividends paid during the year ended April 30, 2019:
Date of Declaration by Board of Directors | Quarterly Cash Dividend | Total Dividend | Class of Common Stock | Dividend Paid Date | Shareholders of Record as of Date
June 21, 2018 | $0.33 per common share | $19.0 million | Class A and Class B | July 18, 2018 | July 3, 2018
September 26, 2018 | $0.33 per common share | $18.9 million | Class A and Class B | October 24, 2018 | October 9, 2018
December 19, 2018 | $0.33 per common share | $18.9 million | Class A and Class B | January 16, 2019 | January 2, 2019
March 20, 2019 | $0.33 per common share | $18.6 million | Class A and Class B | April 17, 2019 | April 2, 2019

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