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Capital Stock and Changes in Capital Accounts - Changes in Common Stock (Details) - shares
shares in Thousands
 6 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Class A common stock    
Changes in Common Stock [Abstract]    
Number of shares, beginning of year (in shares) 70,226 70,208
Conversion of stock, shares issued (in shares) 2 3
Number of shares issued, end of period (in shares) 70,228 70,211
Changes in Common Stock in Treasury [Abstract]    
Number of shares held, beginning of year (in shares) 23,515 23,419
Purchases of treasury shares (in shares) 382 312
Shares issued under the Director Plan to Directors (in shares) (3) (2)
Restricted shares issued from exercise of stock options (in shares) 0 (24)
Shares withheld for taxes (in shares) 100 93
Number of shares held, end of period (in shares) 23,719 23,561
Common stock, shares outstanding (in shares) 46,509 46,650
Class A common stock | Non-PSU Awards    
Changes in Common Stock in Treasury [Abstract]    
Restricted shares issued under stock-based compensation plans (in shares) (125) (129)
Class A common stock | PSU Awards    
Changes in Common Stock in Treasury [Abstract]    
Restricted shares issued under stock-based compensation plans (in shares) (150) (108)
Class B common stock    
Changes in Common Stock [Abstract]    
Number of shares, beginning of year (in shares) 12,956 12,974
Conversion of stock, shares issued (in shares) (2) (3)
Number of shares issued, end of period (in shares) 12,954 12,971
Changes in Common Stock in Treasury [Abstract]    
Number of shares held, beginning of year (in shares) 3,924 3,922
Purchases of treasury shares (in shares) 0 1
Number of shares held, end of period (in shares) 3,924 3,923
Common stock, shares outstanding (in shares) 9,030 9,048