Net Income Per Common Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Basic
Net income	$ 546,520	$ 501,972	$ 446,691
Weighted average shares outstanding-basic (shares)	37,116,152	37,164,022	37,266,851
Basic earnings per common share (in Dollars per share)	$ 14.72	$ 13.51	$ 11.99
Diluted
Net income	$ 546,520	$ 501,972	$ 446,691
Weighted average shares outstanding-basic (shares)	37,116,152	37,164,022	37,266,851
Plus effect of stock options and restricted stock units (shares)	226,860	206,284	252,844
Weighted-average shares outstanding-diluted (shares)	37,343,012	37,370,306	37,519,695
Diluted earnings per common share (in Dollars per share)	$ 14.64	$ 13.43	$ 11.91