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Capital Stock and Changes in Capital Accounts - Changes in Common Stock (Details) - shares
shares in Thousands
 3 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Class A common stock    
Changes in Common Stock [Abstract]    
Number of shares, beginning of year (in shares) 70,231 70,226
Number of shares issued, end of period (in shares) 70,231 70,226
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) 301 212
Shares withheld for taxes (in shares) 126 98
Number of shares held, end of period (in shares) 24,049 23,557
Common stock, shares outstanding (in shares) 46,182 46,669
Class A common stock | Non-PSU Awards    
Changes in Common Stock in Treasury [Abstract]    
Restricted shares issued under stock-based compensation plans (in shares) (128) (119)
Class A common stock | PSU Awards    
Changes in Common Stock in Treasury [Abstract]    
Restricted shares issued under stock-based compensation plans (in shares) (233) (149)
Class B common stock    
Changes in Common Stock [Abstract]    
Number of shares, beginning of year (in shares) 12,951 12,956
Number of shares issued, end of period (in shares) 12,951 12,956
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) 0 0
Number of shares held, end of period (in shares) 3,925 3,924
Common stock, shares outstanding (in shares) 9,026 9,032