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Capital Stock and Changes in Capital Accounts - Changes in Common Stock (Details) - shares
 12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Class A      
Changes in Common Stock [Abstract]      
Number of shares, beginning of year (in shares) 70,231,000 70,226,000 70,208,000
Common stock class conversions (in shares) 28,000 5,000 18,000
Number of shares issued, end of year (in shares) 70,259,000 70,231,000 70,226,000
Changes in Common Stock in Treasury [Abstract]      
Number of shares held, beginning of year (in shares) 23,983,000 23,515,000 23,419,000
Restricted shares issued under stock-based compensation plans (in shares) (662,000) (544,000) (433,000)
Impact of tax withholding on stock-based compensation and other (in shares) 213,000 181,000 116,000
Purchases of treasury shares (in shares) 1,294,000 831,000 542,000
Shares issued related to the acquisition of a business (in shares) 0 0 (129,000)
Number of shares held, end of year (in shares) 24,828,000 23,983,000 23,515,000
Number of Common Stock outstanding, end of year (in shares) 45,431,000 46,248,000 46,711,000
Class B      
Changes in Common Stock [Abstract]      
Number of shares, beginning of year (in shares) 12,951,000 12,956,000 12,974,000
Common stock class conversions (in shares) 28,000 5,000 18,000
Number of shares issued, end of year (in shares) 12,923,000 12,951,000 12,956,000
Changes in Common Stock in Treasury [Abstract]      
Number of shares held, beginning of year (in shares) 3,925,000 3,924,000 3,922,000
Purchases of treasury shares (in shares) 3,000 1,000 2,000
Number of shares held, end of year (in shares) 3,928,000 3,925,000 3,924,000
Number of Common Stock outstanding, end of year (in shares) 8,995,000 9,026,000 9,032,000