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Capital Stock and Changes in Capital Accounts - Changes in Common Stock (Details) - shares
shares in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2024
Jan. 31, 2023
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 (in shares)     7 2
Number of shares issued, end of period (in shares) 70,238 70,228 70,238 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) 203 157 870 539
Shares issued to directors (in shares)     (29) (3)
Restricted shares issued from exercise of stock options (in shares)     0 (14)
Shares withheld for taxes (in shares)     162 129
Number of shares held, end of period (in shares) 24,519 23,808 24,519 23,808
Common stock, shares outstanding (in shares) 45,719 46,420 45,719 46,420
Class A common stock | Non-PSU Awards        
Changes in Common Stock in Treasury [Abstract]        
Restricted shares issued under stock-based compensation plans (in shares)     (234) (208)
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 (in shares)     (7) (2)
Number of shares issued, end of period (in shares) 12,944 12,954 12,944 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 1 2 1
Number of shares held, end of period (in shares) 3,927 3,925 3,927 3,925
Common stock, shares outstanding (in shares) 9,017 9,029 9,017 9,029