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Capital Stock and Changes in Capital Accounts - Changes in Common Stock (Details) - shares
shares in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2023
Oct. 31, 2022
Class A common stock        
Changes in Common Stock [Abstract]        
Number of shares, beginning of year (in shares)     70,231 70,226
Common stock class conversions     3 2
Number of shares issued, end of period (in shares) 70,234 70,228 70,234 70,228
Changes in Common Stock in Treasury [Abstract]        
Number of shares held, beginning of year (in shares)     23,983 23,515
Purchases of treasury shares (in shares) 367 170 668 382
Shares issued to directors (in shares)     (7) (3)
Shares withheld for taxes (in shares)     133 100
Number of shares held, end of period (in shares) 24,393 23,719 24,393 23,719
Common stock, shares outstanding (in shares) 45,841 46,509 45,841 46,509
Class A common stock | Non-PSU Awards        
Changes in Common Stock in Treasury [Abstract]        
Restricted shares issued under stock-based compensation plans (in shares)     (151) (125)
Class A common stock | PSU Awards        
Changes in Common Stock in Treasury [Abstract]        
Restricted shares issued under stock-based compensation plans (in shares)     (233) (150)
Class B common stock        
Changes in Common Stock [Abstract]        
Number of shares, beginning of year (in shares)     12,951 12,956
Common stock class conversions     (3) (2)
Number of shares issued, end of period (in shares) 12,948 12,954 12,948 12,954
Changes in Common Stock in Treasury [Abstract]        
Number of shares held, beginning of year (in shares)     3,925 3,924
Purchases of treasury shares (in shares) 1 0 1 0
Number of shares held, end of period (in shares) 3,926 3,924 3,926 3,924
Common stock, shares outstanding (in shares) 9,022 9,030 9,022 9,030