Capital Stock and Changes in Capital Accounts - Share Repurchases (Details) - $ / shares shares in Thousands	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Class A
Share Repurchases [Abstract]
Stock repurchased during period (in shares)	1,186	1,294	831
Treasury stock acquired, average cost per share (usd per share)	$ 44.16	$ 34.71	$ 42.07
Class B
Share Repurchases [Abstract]
Stock repurchased during period (in shares)	173	3	1
Treasury stock acquired, average cost per share (usd per share)	$ 44.16	$ 34.71	$ 42.07

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.