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Capital Stock and Changes in Capital Accounts - Changes in Common Stock (Details) - shares
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Class A      
Changes in Common Stock [Abstract]      
Number of shares, beginning of year (in shares) 70,226,000 70,208,000 70,166,000
Common stock class conversions (in shares) 5,000 18,000 42,000
Number of shares issued, end of year (in shares) 70,231,000 70,226,000 70,208,000
Changes in Common Stock in Treasury [Abstract]      
Number of shares held, beginning of year (in shares) 23,515,000 23,419,000 23,405,000
Purchases of treasury shares (in shares) 831,000 542,000 308,000
Shares issued to directors (in shares) 0 (2,000) (6,000)
Restricted shares issued from exercise of stock options (in shares) (14,000) (49,000) (60,000)
Shares issued related to the acquisition of a business (in shares) 0 (129,000) 0
Shares withheld for taxes (in shares) 195,000 167,000 129,000
Other (in shares) 0 (2,000) (1,000)
Number of shares held, end of year (in shares) 23,983,000 23,515,000 23,419,000
Number of Class A Common Stock outstanding, end of year (in shares) 46,248,000 46,711,000 46,789,000
Class A | Non-PSU Awards      
Changes in Common Stock in Treasury [Abstract]      
Restricted shares issued under stock-based compensation plans (in shares) (394,000) (323,000) (268,000)
Class A | PSU Awards      
Changes in Common Stock in Treasury [Abstract]      
Restricted shares issued under stock-based compensation plans (in shares) (150,000) (108,000) (88,000)
Class B      
Changes in Common Stock [Abstract]      
Number of shares, beginning of year (in shares) 12,956,000 12,974,000 13,016,000
Common stock class conversions (in shares) (5,000) (18,000) (42,000)
Number of shares issued, end of year (in shares) 12,951,000 12,956,000 12,974,000
Changes in Common Stock in Treasury [Abstract]      
Number of shares held, beginning of year (in shares) 3,924,000 3,922,000 3,920,000
Purchases of treasury shares (in shares) 1,000 2,000 2,000
Number of shares held, end of year (in shares) 3,925,000 3,924,000 3,922,000
Number of Class A Common Stock outstanding, end of year (in shares) 9,026,000 9,032,000 9,052,000